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The Greeks chose the alkaloid coniine, even though it would have served equally well.

Mild cases of alkaloid poisoning can have psychological effects that are similar to euphoria.

Estimates show that there are over 400,000 deaths from alkaloid addiction in the United States each year.

It is the same as any other substituent, with a number or symbol indicating its position on the ring or carbon chain.

Secondary and tertiary amines are named after the nitrogen atom and its alkyl groups.

The root name is determined by the longest continuous chain of carbon atoms.

The map shows how the nonbonding electrons give rise to a red region above the nitrogen atom.

A single amine with three different substituents is not superimposable on a mirror image, and appears to be a chiral center.

The small activation energy of about 25 kJ>mol shows that this is a stable transition state.

The nonbonding electron pair has the lowest priority in the naming of the enantiomers.

If the nitrogen atom is contained in a small ring, it won't be able to get the bond angles that facilitate inversion.

Weak hydrogen bonds are formed by amines and alcohols of similar weights.

The boiling points of primary and secondary amines are lower than those of alcohols.

Table 19-1 compares the boiling points of ether, alcohol, and amine.

In order to increase boiling points, rank each set of compounds.

An amine is a Lewis base because it has a single pair of nonbonding electrons.

A basic solution of amines turn litmus paper blue.

The amine is a stronger base if structural features shift the reaction toward the right.

The free amine is weakened by features that shift the reaction to the left.

The stabilization lowers the potential energy of the cation, making it a stronger base than ammonia.

There are more alkyl groups around the secondary and tertiary amines that make it harder for water to approach them.

The free amine has resonance delocalization of the nonbonding electrons.

The aromatic ring and the orbital containing nitrogen's lone pair are related in aniline.

This overlap is lost in the anilinium ion, so the reactant is stable compared with the product.

pyrrole is a very weak base because of the unfavorable protonsation on nitrogen.

The study of terminal alkynes showed that it's basic than aliphatic amines.

When the nitrogen atom is used to explain why the amine is weaker than the aliphatic, this principle helps true.

As in aniline, a protons, Pyridine's nonbonding electrons are less available for bonding to the aromatic ring.

In order to increase basicity, rank each set of compounds.

The amine salt is composed of two different types of ion.

Water is relatively insoluble in amine containing more than six carbon atoms.

The remedy is advertised as a "natural" dissolve because of the amine form of the acid.

Amine salts have no fishy odor and are less prone to decomposition by oxidation and other reactions.

It has an unpleasant fishy odor and is oxidation by air to undesirable products.

Cocaine is usually smuggled and snorted as the hydrochloride salt, which is often divided more stable and gives off less odor to alert the authorities.

Smoking cocaine can cause lines on a mirror and more intense rush because of fast absorption by lung tissues.

"rocks" are used to smoke cocaine and extract it into a crude pipe.

The mixture is called "crack cocaine" because it makes a crackling sound when heated.

The general aspects of amines have been discussed in earlier chapters.

We show how we combine this information to identify the presence of an amine.

Depending on the extent of hydrogen bonding, amines of protons absorb chemical shifts.

The protons on the a carbon atoms of amines are not as strong as they would be if Nitrogen and Oxygen were present.

The exact position of the carbon atoms depends on the structure and substitution of the amine.

The chemical shifts show a downfield movement of about 0.2 parts per million.

The chemical shift of the carbon atom is usually 30 to 50 parts per million.

Our general rule is that a carbon atom shows a chemical shift about 20 times as great as the protons bonding to it.

In propan-1-amine, the carbon atom absorbs at a higher rate than the protons.

Give peak assignments for all of the protons in the structure of the amine.

Show which carbon atom(s) are responsible for absorption in each structure.

Stable compounds with carbon, hydrogen, oxygen, chlorine, bromine, and iodine give the molecule ion with mass numbers.

The molecule's weight is odd when a nitrogen atom is present.

The mass spectrum of butyl propyl amine is shown in Figure 19-9.

The base peak has a resonance-stabilized iminium ion and a propyl radical.

Arylamines and pyridine undergo aromatic changes that are important for amine synthesis.

In an arylamine, the nonbonding electrons on nitrogen help keep intermediates stable.

The following reactions show the halogenation of aniline derivatives.

A full positive charge can be found in the ammonium salt that is given by strongly acidic reagents.

Sometimes violent reactions can be caused by oxidizers such as nitric and sulfuric acids.

Section 19-12 will show how acylated the group can be used to decrease its basicity and allow substitution by a wide variety of electrophiles.

pyridine looks like a strongly deactivated benzene in its aromatic substitution reactions.

The positively charged intermediate can't be stable because its nonbonding electrons are close to the p system.

An unstable intermediate can be found with one of the resonance structures showing a positive charge and only six electrons on nitrogen.

The tendency of the nitrogen atom to attack and take on a positive charge hinders the substitution of pyridine.

Show why this orientation is not observed by proposing a mechanism for nitration of pyridine at the 4-position.

When 3-bromopyridine is used, stronger reaction conditions are required and a mixture of 3-aminopyridine and 4-aminopyridine results.

A mild base is added to deprotonate the intermediate alkylated amine and to neutralize the large quantities of HX formed.

It is convenient to use a large excess because ammonia is inexpensive and has a low weight.

The probability of dialkylation is small if the primary amine is added to a large amount of ammonia.

The acid chloride has a chlorine atom that draws electron density away from the carbonyl carbon, making it more electrophilic.

Adding a base such as pyridine or NaOH can make a difference.

A nucleophile attacks the strongly philic carbonyl group of the acid chloride.

Amides are stable by a structure that involves nitrogen's nonbonding electrons and a positive charge.

If aniline is acetylated to give acetanilide, the resulting amide is still active.

As shown next, acetanilide can be treated with acidic and mild oxidizing reagents.

The body's own defense mechanisms can destroy the infection if Sulfanilamide is not used.

The same sulfonyl chloride is used in the sulfanilamide synthesis to make sulfathiazole and sulfapyridine.

Alcohols and alkyl halides can be converted to alkenes by elimination reactions.

An amine can't be eliminated directly because the leaving group is a very weak base and a poor one.

A good leaving group can be converted to a quaternary ammonium salt by exhaustive methyla tion.

The E2 mechanism requires a strong base to eliminate the quaternary ammonium salt.

The base is provided by converting the quaternary ammonium iodide to the hydroxide salt.

The elimination is a one-step, concerted E2 reaction using an amine as the leaving group.

The eliminations of alkyl halides usually follow Zaitsev's rule.

The sheer bulk of the leaving group is one of the reasons why the Hofmann elimination prefers the least-substituted alkene.

The E2 mechanism requires an anti-coplanar arrangement of the leaving group and the protons.

The large trialkylamine leaving group in the Hofmann elimination can interfere with the coplanar arrangement.

Predict the major product when the following amine is treated with excess iodomethane and then heated with silver oxide.

Finding every possible elimination of the salt is required to solve this problem.

There are three possible elimination routes shown by the green, blue, and red arrows.

Predict the major products formed when the following amines undergo elimination are best methylation, treatment with Ag2O, and heating.

One of the reasons for converting amine to their salts is to prevent air oxidation.

Side products are often sants, but they are rarely formed, and the yields may be low.

The mechanisms of amine oxidations are due to many side not well characterized.

O bond of amine oxide formed by donation of electrons on nitrogen is often written as an arrow in older literature.

The base and leaving group are eliminated using an amine oxide.

When the following compound is treated with H2O2 and heated, predict the products expected.

When tertiary amines are treated with a peroxyacid and heated, give the products expected.

Stereochemical drawings of the transition states can be used to explain the observations.

Most reactions of amines with nitrous acid use the nitrosonium ion as the intermediate.

The diazonium ion is caused by the loss of water and the hydroxy group.

Complex mixture of products are usually given by the decomposition of alkanediazonium salts.

Arenediazonium salts are relatively stable and serve as intermediates in a variety of synthetic reactions.

The tautomerism is formed by a diazonium ion with a primary amine.

Experiments show thatnitrosoamines cause cancer in laboratory animals.

The use of sodium nitrite to preserve meats such as bacon, ham, and hot dogs has generated concern.

Because nitrites are naturally present in many other foods, it's not clear how much risk is involved in preserving meats.

A primary aromatic amine is diazotizing the Arenediazonium salts.

An activated aromatic position can be converted into a wide variety of functional groups by forming and diazotizing an amine.

When the acidic solution of an arenediazonium salt is warmed, hydrolysis takes place.

This is a useful laboratory synthesis of phenols because it does not require strong electron-drawing substituents or powerful bases.

The Sandmeyer reaction is an excellent method for attaching carbon substituent to an aromatic ring.

One of the best ways to make iodobenzene derivatives is by causing a severe in the brain.

Hypophos phorus acid replaces the diazonium group with a hydrogen.

bromination to its ortho positions is directed by the strongly activated amino group.

diazonium salts only react with strongly activated rings because they are weak electrophiles.

COO- ) groups on the molecule to promote solubility in water and to help bind the dye to the polar surfaces of cotton and wool.

Adding another alkyl group is one of the most common amine syntheses.

We form an imine or oxime derivative of a ketone or aldehyde and then reduce it to amine.

condensation of hydroxylamine with a ketone or an aldehyde leads to reduction of oxime.

An iminium salt is given by the condensation of a secondary amine with a ketone or aldehyde.

It reduces the imine faster than the carbonyl group, and it is less reactive than sodium borohydride.

Adding a cyclopentyl group to aniline is required to make a ketone.

Show how to synthesise the following amines from the indicated starting materials.

An amide is less nucleophilic and unlikely to over-acylate, which is the result of acylation of the starting amine.

Adding an ethyl group is required to make a tertiary amine.

If you compare this synthesis with the Solved Problem 19-5(b) you will see how reductive amination and acylation-reduction can accomplish the same result.

There is a tendency for over alkylation to form a mixture of monoalkylated and polyalkylated products.

Simple primary amines can be synthesised by adding a halide or tosylate to a large amount of ammonia.

The phthalimide anion is a strong nucleophilic and can be tosylate or replaced with a halide.

Gabriel used the anion of phthalimide to put the nitrogen atom into a primary amine.

The reduction of nitriles to primary amines is done by the production of nitrogen gas.

Amine has an additional carbon atom when the C, N group is added and reduced.

We saw that cyanide ion adds to the aldehydes and ketones that make up cyanohydrins.

The N group of the cyanohydrin has a way to synthesise b@hydroxy amines.

Sub stituted anilines are the most common reason for reducing aromatic nitro compounds.

A ammonia with one or more alkyl or aryl groups bonds to the nitrogen atom.

A diazonium salt is formed by the reaction of a primary amine with nitrous acid.

An excess of an alkylating agent is used to form the quaternary ammonium salt.

Determine the structures with the help of the IR, NMR, and mass spectrum of amines.

Predict the products of reactions of amines with aldehydes, alkyl halides and tosylates, acid chlorides, sulfonyl chlorides, nitrous acid, and agents.

Give examples of the use of arenediazonium ion salts in the synthesis of phenols and aryl chlorides.

Predict the major products andIllustrate the uses and mechanisms of the eliminations.

Show how to use amines as starting materials and intermediates in multistep synthesis.

In order to increase basicity, rank the amine in each set.

Predict whether the reactants or products are favored by completing the following proposed acid-base reactions.

Once considered a safe diet pill, methamphetamine is now addictive and destructive to brain tissue.

Parkinson's disease is thought to be caused by a dopamine deficiency.

The carbon chain is not affected by the reduction of azides and nitro compounds.

One carbon atom is added by formation and reduction of nitrile.

Toluene, benzene, and alcohols with no more than four carbon atoms can be used as starting materials.

Show how the reaction gives the observed product by proposing a complete structure for coniine.

A chemist is summoned to an abandoned waste-disposal site to determine the contents of a leaking barrel.

The chemist takes a sample to her laboratory from the barrel and doesn't use a mask to approach it.

The EPA restricts the disposal of liquid waste because they leak out of their containers.

Mild reagents and conditions are sufficient for Pyrrole to undergo aromatic substitution.

Section 17-12 shows how aromatic substitution can give aryl amines if there is a strong electron-drawing group.

The suspect was not a good chemist and was unable to follow instructions from the person who gave him the P2P bottle.

They found bongs and pipes with marijuana and cocaine in them, as well as zinc strips, flasks, and other equipment.

In Section 19-10B, we saw that pyridine undergoes an aromatic substitution reluctantly, requiring strong conditions and disappointing yields.

Good yields of substitution on C2 and C4 can be found under moderate conditions.

The alkyl group is restricted to a 1deg or 2deg carbon byeductive amination of aldehydes and ketones.

Show how the azo group can be used to facilitate aromatic substitution.

Some pathogenicbacteria have developed resistance to erythromycin by evolving an enzymatic mechanism to cleave the macrocycle at the ketone.

The erythromycin structure was modified to replace the ketone with an amine to counter the resistance.

One of the most prescribed drugs in the world for respiratory infections is a modified antibiotic called azithromycin.

The classification as macrolides requires you to identify the lactone group in each structure.

3 Propose single-step and multistep synthesis of carboxylic acids from compounds with other functional groups.

The names of several aliphatic carboxylic acids reflect their historical sources.

Table 20-2 contains the names and physical properties of some dicarboxylic acids.

The simple carboxylic acids are given common names using Greek letters.

Greek letters begin with the carbon atom next to the carboxyl group.

The parent alkane name is determined by using the longest continuous chain that has both carboxyl groups.

One of the unshared electron pairs on the hydroxy oxygen atom is delocalized into the pi system of the carbonyl group.

Alcohols, ketones, and aldehydes boil at higher temperatures than carboxylic acids.

Unless they have double bonds, acids with more than eight carbon atoms are generally solid.

A lower melting point is caused by the presence of double bonds in a long chain.

A high temperature is needed to break the lattice of hydrogen bonds in the crystal and melt the diacid.

When acids with more than 10 carbon atoms are nearly insoluble in water, it's time to increase the length of the hydrocarbon chain.

Tables 20-1 and 20-2 show the water solubilities of carboxylic acids and diacids.

The dimeric form of the acid in the nonpolar solvent causes it to be quite soluble in chloroform.

When the acid is dissolved in a nonpolar solvent, the hydrogen bonds of the cyclic dimer are not disrupted.

A stronger acid can be created by stabilizing the negatively charged carboxylate ion.

The strength of an acid is enhanced by the withdrawal of electron density from the carboxylate ion.

The magnitude of the substituent effect depends on the distance from the carboxyl group.

The strongest effects are for substituents in the ortho and para positions.

In order to increase acid strength, rank the compounds in each set.

carboxylate ion, cation remaining from base, and water are what the products are.

The previous example shows that acetic acid reacts with sodium hydroxide.

Carboxylate salts of the alkali metals Thimerosal have been used as an antiseptic for a long time.

Depro has encouraged the development tonated by the weak base sodium bicarbonate, forming the sodium salt of the acid, of Thimerosal-free antiseptics and carbon dioxide, and water.

The acid that is insoluble in water butsoluble in ether is regenerated when the phases are separated.

Oxidation of a primary alcohol to an aldehyde can cause over-oxidation of the carboxylic acid.

Wine and cider oxidizes to acetic acid when exposed to air.

It is not suitable for a laboratory synthesis because it requires high pressures.

Benzoic acid is a starting material for synthesis and is used as an ingredient in medications.

The starting material for the industrial synthesis of adipic acid is benzene.

The most obvious feature of a carboxylic acid is its less environmental impact than bonyl stretching absorption.

The chemical shifts of carboxylic acids are similar to those of ketones and aldehydes.

The absorption corresponds to the weak transition in the spectrum of ketones and aldehydes.

One C double bond conju gated with the carboxyl group results in a spectrum with lmax between 200 and 10,000.

Loss of a molecule of an alkene is the most common form of fragmentation.

There is a loss of an alkyl radical to give a resonance-stabilized cation with the positive charge delocalized over an allylic system and two oxygen atoms.

We use Grignard tremors, seizures, brain damage, and reagents and nitriles as intermediates in our review of those.

oxidation the harvest of contaminated seafood is one of the three methods we have encountered for preparing carboxylic acids.

Depending on the substitution of the original double bond, ketones or acids may result.

The triple bond to give carboxylic acids is cleaved by either ozonolysis or a vigorous permanganate oxidation.

A defensive spray consisting of groups of ketones and aldehydes is created when Grignard reagents are added to the carbonyl.

Show how you would synthesise the following carboxylic acids, using the indicated Oxidation of alcohols.

Grignard reagents add carbon dioxide to form magnesium salts of carboxylic acids.

The most common method for interconverting these derivatives is nucleophilic acyl substitution.

We can group the mechanisms according to whether they take place under acidic or basic conditions.

The basecatalyzed hydrolysis of an ester to the carboxylate salt of an acid is an example of this mechanism.

A useful example of an acid-catalyzed nucleophilic acyl substitution is the Fischer esterification.

The carbonyl group of a carboxylic acid is not sufficiently philic to be attacked by alcohol.

Attack by alcohol, followed by the loss of a protons, gives the hydride of an ester.

Important resonance forms of the intermediates shown in brackets were omitted by the Key Mechanism.

The resonance forms of these two intermediates are a perfect example of how to complete the mechanism.

In the final step, a resonance-stabilized carbocation loses a protons to give the ester.

A carboxylic acid has two oxygen atoms and two nonbonding pairs of electrons.

The carboxylic acid has resonance forms that are on the hydroxy oxygen atom.

Secondary and tertiary alcohols give smaller equilibrium constants.

Excess of one of the reactants or removal of one of the products can be used to drive sterification to the right.

Excess alcohol is often used to drive the equilibrium in forming ethyl esters.

This is a common method for making esters in both the laboratory and industry because it is easy to drive the Fischer esterification toward a favorable equilibrium.

Irving Roberts and Harold Urey of Columbia University were the first to use isotopic labeling to follow the alcohol oxygen atom through the reaction.

Suggest a way to determine the amounts of 18O in the separated components of the mixture.

It is easy to give formic acid and three equivalents of ethanol with ethyl orthoformate hydrolyzes.

The reverse path of the Fischer esterification is followed by hydrolysis of ethyl formate.

Some important resonance forms of the intermediates shown in brackets were missing from the solution given for Solved Problem 20-1.

Provide a mechanism for the acid-catalyzed hydrolysis of ethyl formate to finish the solution.

Excess diazo polar or reactive compounds for mass methane also evaporate.

Nitrogen is displaced by aphilic attack on the methyl group.

diazomethane is rarely used in large-scale laboratory reactions because it is hazardous in large quantities.

Borane reacts with the carboxyl group faster than any other carbonyl function.

The following example shows that it gives excellent selectivity when a carboxylic acid is reduced.

Overalkylation is not observed because the ketone is formed in a separate step from the organolithium reagent.

Under mildly acidic conditions, propose a mechanism for conversion of the dianion to the ketone.

Acid chlorides react with a wide range of nucleophiles through the addition-elimination mechanism.

The addition-elimination mechanism discussed on the previous page allows acid chlorides to give esters through a nucleophilic acyl substi tution.

The two-step method for converting a carboxylic acid to an ester is provided by this reaction.

Pyridine and other bases are added to make it less likely that HCl will be generated.

Ammonia and amines react with acid chlorides to give amides.

Adding a base such as pyridine or NaOH will prevent the amine from being protonsated.

Molecules smaller than the pores are admitted with dehydrated zeolite crystals.

A leaving group on a carbonyl carbon atom is replaced by a nucleophile.

Determine the structures of carboxylic acids with the help of the IR, UV, NMR, and mass spectrums.

Predict the reactions of carboxylic acids with alcohols, amines, diazomethane, reducing agents, and organometallic reagents.

Show how the equilibrium can be driven toward the products or the reactants by proposing a mechanism for a Fischer esterification.

Show how you would separate a mixture of compounds using a separatory funnel.

You can use any necessary reagents if you show how you would accomplish the following syntheses efficiently.

The configuration at each asymmetric carbon atom can be specified by drawing three-dimensional structures of the two stereoisomers.

An organic compound has the IR, NMR, and mass spectrum provided.

Sections 20-8B and 20-8C cover two of the methods for converting alkyl halides to carboxylic acids.

The first is the formation of a Grignard reagent followed by the addition of carbon dioxide and acid.

The other involves substitution by cyanide ion followed by the hydrolysis of the nitrile.

The stockroom manager took an IR spectrum of the liquid in the bottle and found a sharp carbonyl stretch around 1720 cm-1 and small peaks around 2710 and 2810 cm-1, as shown on the next page.

Explain the discrepancy between the results of the students and the stockroom manager's spectrum.

Predict the major form of each compound when it is dissolved in water.

To determine the structures of carboxylic acid derivatives, draw and name them.

Discuss the physical properties of acid derivatives and compare their reactivity.

Acid derivatives from compounds with other functional groups should be proposed for single-step and multistep synthesis.

Predict the products and propose mechanisms for the reactions of carboxylic acid derivatives.

Making and using derivatives of carboxylic acids are some of the advances in organic chemistry.

Synthetic amides have been created that mimic the desirable properties of proteins.

The nylon in a climbing rope is a synthetic polyamide that mimics a spider's web.

The antimicrobial properties of naturally occurring antibiotics are extended by Amides.

The tastes and odors of fruits and flowers are created by plants.

In addition to making synthetic esters for flavors, odors, and lubricants, chemists have made synthetic polyesters such as Dacron for clothing and Mylar for magnetic recording tapes.

ripe bananas have a characteristic odor, and geranyl acetate is found in the oil of roses.

The carboxylic acids have a carbonyl group bonding to a negative atom.

An alcohol and carboxylic acid combination with a loss of a molecule of water is called an ester.

The Greek letter designates the carbon atom that bears the hydroxy group.

The carbonyl oxygen atom is the location of the protons rather than on nitrogen.

nitrile has a single pair of electrons on nitrogen, but it is not very basic.

The electrons are tightly bound and unreactive, and they are close to the nucleus.

The carbonyl group is activated by the chlorine atom in an acid chloride.

Half of anhydride's acid units are lost when leaving groups.

The priorities are summarized in the table, along with the suffixes used for main groups and the prefixes used for substituents.

The boiling points of these acid derivatives are unaffected by the carbonyl group's polarity.

elevated boiling points are caused by strongly hydrogen bonding in the liquid phase.

Strong hydrogen bonding in amides intermolecular attractions is caused by R stabilizing the liquid phase.

High melting points are caused by strong hydrogen bonding between primary and secondary amides.

Acid derivatives can be found in common organic solvents such as alcohols, ethers, chlorinated alkanes, and aromatic hydrocarbons.

Acid chlorides and anhydride can't be used in water and alcohols because they react with them.

Many of the smaller esters, amides, and nitriles are able to form hydrogen bonds with water because of their high polarity.

A boiling point of 77 degC is convenient for easy evaporation from a reaction mixture.

The variations in the carbonyl absorptions are predictable and reliable for most acid derivatives.

The best way to detect and differentiate these carboxylic acid derivatives is through the use of IR.

The IR absorptions of carbonyl functional groups are summarized in Table 21.

A complete table of IR frequencies can be found in Appendix 2.

Strong carbonyl stretching absorptions are provided by Amides, ketones, carboxylic acids, and aldehydes.

Simple amides have lower carbonyl stretching frequencies than other carboxylic acid derivatives and can absorb up to 1680 cm-1.

The increase in carbonyl stretching frequencies can be seen in cyclic ketones with five-membered or smaller rings.

The carbonyl stretching of an acid chloride occurs at a information that can be used to determine high frequencies.

List the frequencies you used to make your decision, and determine the functional group suggested by each spectrum.

The combination of IR and NMR gives enough information to determine the structure.

Depending on concentration and solvent, the H protons of an amide may be broad or split.

3@ hybridized carbons in oxygen in esters and nitrogen in Amides absorb around 60 to 80 parts per million, and those in nitrogen in Amides absorb around 40 to 60 parts per million.

Determine the structure of the unknown compound with each set of IR and NMR data.

The leaving group is replaced by the nucleophilic reagent through this addition-elimination process.

Predicting these reactions requires knowing the relative reactivity of acid derivatives.

boiling acetamide in acid or base for several hours is how it is hydrolyzed.

An acid chloride can easily be converted to an anhydride, ester, or amide.

An amide can only be added to the acid or the carboxylate ion in basic conditions.

The addition-elimination mechanism of nucleophilic acyl substitution is the intermediate theme.

The regenerate the carbonyl group reactions are only found in the nature of the nucleophile.

Acid chlorides can be used to synthesise anhydride, practice using path esters, and amides.

The strongly elec apply can be attacked by either oxygen atom of the acid.

The standard pattern of an addition-elimination mechanism ends with a loss of a protons to give the final product.

Acid chlorides react with alcohols in a strongly exothermic reaction.

The standard addition-elimination mechanism leads to the loss of a protons to give the final product.

A primary amide is created by the reaction of an acid chloride with ammonia.

The standard addition-elimination mechanism ends with the loss of a protons to give the ester.

The standard addition-elimination mechanism ends with a loss of a protons to give the amide.

It is difficult to distinguish between the two mechanisms because of the fast transfer of protons between the oxygen atoms.

A mechanism for the reaction of aniline with ethyl acetate to give acetanilide is proposed.

You should be surprised by the loss of an alkoxide ion as a leaving group in the second step of ammonolysis.

A strong base may serve as a second step if it leaves in a transition state that resembles the reactant.

The bond to the leaving group has barely begun to break in this exothermic step.

The energy of an unstable, negatively charged transition state is not very sensitive to a stable molecule.

The first example of a reaction with strong bases as leaving groups is nucleophilic acyl substitution.

The simplest and best example of the acid-catalyzed and base-catalyzed nucleophilic acyl substitution mechanisms is transesterification.

One of the products is a lactone, when ethyl 4-hydroxybutyrate is heated in the presence of a trace of a basic catalyst.

The stepwise procedure is used to propose a mecha CH O O nism for the following reaction.

Draw out all the individual steps to complete the mechanism for acid-catalyzed transesterification.

Extra proton transfers are required before and after the major steps.

Basic nucleophilic acyl substitution reactions work better with acid catalysts.

The reaction can be completed in a minute or two with the addition of a drop of sulfuric acid.

Explain how a single drop of sulfuric acid increases reaction rate.

Exposure to moist air can cause hydrolysis of an acid halide or anhydride.

When a fat is hydrolyzed, the resulting long-chain sodium carboxylate salts are what we know as soap.

Under basic conditions, draw a mechanism for the hydrolysis of this compound.

Amides are the most stable of the acid derivatives, and stronger conditions are required for their hydrolysis.

To show which steps are exothermic to drive the reactions to completion.

The elec trophilic carbon of the cyano group is attacked by hydroxide.

There is a mechanism for the basic hydrolysis of benzonitrile to the benzoate ion and ammonia.

Under acidic conditions, the tautomerism involves deprotonation on oxygen and nitrogen.

Acid derivatives are relatively difficult to reduce and need a strong agent such as LiAlH4 to do so.

Acid chlorides can be converted to primary alcohols by either lithium aluminum hydride or sodium borohydride.

Both acid chlorides and esters react through an addition-elimination mechanism to give aldehydes.

Diisobutylaluminum hydride reduces nitriles to aldehydes at low temperatures.

The mechanism of this reduction is similar to a typical nucleophilic acyl substitu tion, with hydride ion adding to the carbonyl group.

An imine or iminium salt is created when the oxygen atom leaves.

Grignard and organolithium reagents add more acid to give alkoxides.

The mechanism involves substitution at the acyl carbon atom.

Attack by the carbanion-like organometallic reagent, followed by elimination of alkoxide, gives a ketone.

Unless the original ester is a formate, hydrolysis gives tertiary alcohols.

Grignards add to esters and acid acetophenone with magnesium salt.

There is a mechanism for the reaction of propanoyl chloride with 2 moles of phenylmagnesium a hydrogen from the ester and two bromide.

Any reactions that are peculiar to a specific class of acid derivatives are covered in these sections.