13 Nuclear Magnetic Resonance Spectroscopy

For diesel and gasoline engines, ether is used as a volatile starting fluid.

Patients vomited as they regained consciousness when ether was used as a surgical anesthetic for over a hundred years.

The hybrid oxygen atom makes it easy to administer.

In a typical ether, the bulk of the alkyl groups enlarges the bond angle.

The structure of dimethyl ether is shown in Figure 14-1.

ethers are still strongly polar compounds despite not having the polar hydroxy group of alcohols.

Table 14-1 compares the dipole moments of dimethyl ether, diethyl ether, and tetrahydrofuran with those of alkanes and alcohols.
A strongly polar solvent can be provided by an ether such as THF.

The boiling points of ethers, alcohols, and alkanes are compared.

The boiling points of alcohols are similar to those of dimethyl ether and diethyl ether.
The attractions that result from the large dipole moments of ethers don't seem to have much effect on their boiling points.

The molecule that forms the weak partial bond to the hydrogen atom is called the acceptor.

An early inhaler for ether anesthesia, a hydrogen bond with an alcohol, but it cannot form in 1847. ethers are more volatile than alcohols because of the ether-soaked sponges.

Table 14-2 shows the physical properties of a face mask with valves.

Many organic reactions can be done with ethers.

The alcohols have higher boiling points.

The ethers have similar boiling points to alkanes.

They are not hydrogen bond donors.

ethers can serve as hydrogen bond acceptors if there is no hydrogen bond.

The ability to serve as hydrogen bond acceptors is one of the reasons why 2-Methyltetrahydrofuran is a polar substance.

The nonbonding electron pairs of an ether effectively solvate cations, as shown in it comes from corncobs.

Alcohols and ethers do not solvate anions.
Rather than stances with small, hard anions requiring strong solvation to overcome their ionic petroleum, there are ion sub waste plant sources.

Substances with large, diffuse anions are more likely to be found in ether than smaller, harder anions.

The basic reagent was destroyed by the hydroxy group.

Nonhydroxylic ethers are usually unreactive toward strong bases.

For very strong polar bases, ethers are often used as solvents.
The four ethers shown are commonly used for organic reactions.
Diethyl ether is found in water and miscible with water.

The order of their dissolving ability should be ranked.

The formation and use of many reagents are enhanced by the special properties of ethers.

The cations are solvate.

They don't solvate anions well.

An ether's nonbonding electrons are stable.

It is easy to measure and transfer a 1 M solution like any other airsensitive liquid reagent.

The convenience of hydroboration has been contributed by R #3 THF.

H helps keep it in solution.

Lewis acid catalysts are used in a wide variety of reactions.

Like diborane, BF3 is a toxic gas, but it forms a stable complex with ethers, so it can be stored, measured, and even distilled.

Crown ethers are used to remove metal cations from large polyethers that are radioactive in the center of the ring.

Different crown ethers have different cations.
It is possible to extract radioactive cesium on the relative sizes of the crown ether and the cation and the number of binding sites and strontium around the cation.

Complexation by crown ethers helps polar salts to break down.

When the uncomplexed anions show greatly enhanced reactivity, polar salts can be used.

In Section 6-10B, we talked about using 18-crown-6 to remove the poorly solvated fluoride ion from acetonitrile.

carboxylate salts, cyanides, and permanganates can be dissolved in crown ethers.
The crown ether only complexes the cation, leaving the anion bare.

In the presence of 18-crown-6, the permanganate is dissolved in benzene to make purple benzene, a useful reagent for oxidizing alkenes.

A drawing of the complex can be used to show why the permanganate ion is enhanced.

Common names are used for simple ethers.

The alkyl groups should be named in with severe air pollution.

Many people still use the old system, which was often called the "oxygenate" system in order to increase complexity.
If only one alkyl tions has a low toxicity.

In gasoline, cyclohexyl methyl ether is called MTBE.

The only clear way to identify complex ethers is through systematic nomenclature.

Give a common name and systematic name for each compound.

Useful ethers include Heterocyclic ethers.

Adding "oxide" to the name of the alkene oxidizes it into a common name of an oxide.

The synthesis and common names of two simple epoxides are shown in the reactions of the fumigant for foods, textiles, and soil.

Another method uses the name "oxirane" as the systematic name for the parent compound, ethylene oxide.

The lowest substituent numbers are given to the ring atoms of the compound when they are numbered.
For comparison, the "epoxy" system names are listed in blue.
The "epoxy" system names have a different numbering than the ring.

The four-membered rings are more reactive than larger ethers because they are strained.

They aren't as reactive as the oxiranes.

The aromaticity of furan and other Heterocycles is considered in Chapter 16.

One of the most polar ethers is tetrahydrofuran.

Grignard reactions can succeed even when they fail in diethyl ether.

The two oxygen atoms in a 1,4-relationship are the most common form of dioxane.

1,4-Dioxane is used as a polar solvent for organic reactions.

It has been in the environment for millions of years because it is formed in forest fires.

Dioxins are toxic and cause cancer because they associate with DNA and cause a misreading of the genetic code.

The acid-catalyzed condensation of an alcohol makes 1,4-Dioxane.

Show the alcohol that will lose water and give 1,4-dioxane.

There is a mechanism for this reaction.

The following ethers have names.

There are no obvious or reliable absorptions for ethers.

Many compounds other than ethers give similar absorptions, but O stretch around 1000 to 1200 cm-1.
If the molecu lar formula contains an oxygen atom, the lack of carbonyl or hydroxy absorptions in the IR suggests an ether.

One of the carbon atoms bonding to oxygen is the most common cause of ethers being fragmented.

The loss of the two alkyl groups can cause another oxonium ion or an alkyl cation.

The four most abundant ion are loss of an ethyl group, a cleavage, and loss of an ethylene molecule.

Between 13 C d65-d90 d 65 and d 90, a carbon atom bonds to oxygen.

Between d 3.5 and d 4 in the 1H NMR spectrum, H to oxygen absorbs chemical shifts.

Both alcohols and ethers have resonances.

Both butyl ether and alcohol are on the page.

An ether is the most likely functional group.

Most of the methods for synthesizing ethers have already been seen.

We are looking at the mechanisms to see which method is most suitable for preparing various kinds of ethers.
The method involves attacking an alkoxide ion on a primary alkyl halide.

Secondary alkyl halides and tosylates are occasionally used in the Williamson synthesis, but elimination competes and the yields are poor.

Adding Na, K, or NaH to alcohol can make the alkoxide.

The desired reaction can't happen on the tertiary alkyl halide.

The alkoxide ion is a strong base and elimination prevails.

The less hindered alkyl group would be used in a better synthesis.

The synthesis of 3-butoxy-1,1-dimethylcyclohexane from 3,3-dimethylcyclohexanol and butan-1-ol was proposed.

The alkoxide fragment can be used, but not the halide fragment.

The phenoxide ion is more acidic than aliphatic alcohols.
The alkoxide should have a good leaving group and a good primary alkyl group.

You can use alcohols or phenols as your starting materials.

The product is ether.

Show how the alcohol group alkoxymercuration could be used to synthesise ethers.

Bimolecular condensation competes with unimolecular dehydration.

To form an ether, the alcohol must have an unimpeded primary alkyl group, and the temperature must not be allowed to rise too high.
If the temperature is too high, the delicate balance between substitution and elimination shifts, and very little ether is formed.
Bimolecular condensation is used to make ethers.
The laboratory synthesis of ethers doesn't use the condensation very much.

Bimolecular condensation is a cheap synthesis of diethyl ether.

The industrial method is used to produce millions of gallons of diethyl ether each year.

As shown above,propyl ether.

propene is formed when the temperature is too high.
Explain why propene is favored at higher temperatures.

If you can't be formed by condensation, suggest an alternative method.

It's a must that R' is primary.

R should be the primary.

Unlike alcohols, ethers do not undergo many reactions and are not commonly used as synthetic intermediates.

ethers are attractive as solvents because of unreactivity.

ethers do have a limited number of reactions.

alkyl bromides or alkyl iodides are given to the ethers by heating them.

Under acidic conditions, ethers can react.

Alcohol serves as a neutral leaving group and can be used to replace a protonsated ether.

bromide and iodide are good nucleophilics for the substitution of ether because they are sufficiently acidic to protonsate the ether.
The alcohol leaving group usually reacts further with HX to give another alkyl halide.

This reaction converts a dialkyl ether into two alkyl halides.

The molecule must not contain acid-sensitive functional groups because of the strong conditions.

Iodide and bromide ion are good nucleophiles but weak bases, so they are more likely to substitute by the SN2 mechanism than to promote elimination by the E2 mecha nism.

The mechanism 14-1 shows how bromide ion cleaves the ether.
The following example shows how cyclopentyl ethyl ether reacts with HBr to produce cyclopentanol.
The final products are ethyl bromide and bromocyclopentane.

The ethers are cleaved by a substitution of the two acids.

The ether is used to form a group.

Depending on the structure of the alcohol and the reaction conditions, the conversion can be done by either of the two mechanisms shown in Section 11-7.

The ether is used to form a group.

The alcohol is protonated to form a group.

The same thing happens with ethers with br hydroiodic acid.

Aqueous iodide reacts at a faster rate than aqueous bromide.
The mechanism for the reaction should be proposed.

One of the groups bonding to oxygen is a benzene ring and it reacts with other groups to give alkyl halides and phenols.

The hybridized carbon atom of the phenol cannot be converted to the halide.

Both alkyl Predict the products of the following reactions can be converted.

There is an excess of acid in each case.

Boron tribromide cleaves ethers to give alkyl halides and alcohols.

The Lewis acid-base adduct of the ether is thought to have been attacked by a bromide ion.

Propose a way to give butan-1-ol and bromomethane after the reaction of butyl methyl ether.

Large containers of ethers are often purchased by organic chemists.

The autoxidation process begins after a container has been opened.
A large amount of peroxide may be present after several months.
An explosion may occur if Distillation concentrates the peroxides.

Simple precautions may be taken to avoid an explosion.

Buying ethers should be done in small quantities and kept in tightly sealed containers.
The only ether that should be used in any procedure is peroxidefree ether.
If ether is contaminated with peroxides, it should be discarded or destroyed.

The chemistry of ethers is similar to that of thiols, except that thiols can undergo oxidation and alkylation of the sulfur atom.

Silyl ethers have some of the same properties as ethers, but they are more easily formed.

Silyl ethers are frequently used to protect alcohols.

The smell of dimethyl sulfide is similar to oysters that have been kept in the refrigerator for too long.

"sulfide" replaces "ether" in the common names for sphinxes.

The synthesis of ethers, Epoxides, and Thioethers can be done with the use of a thiolate ion.

Thiols are more acidic than water.

It is easy to generate thiol ion by treating them with a liquid.

Sulfur is larger and more polarizable than oxygen, so it's even better as a nucleophile.

Secondary alkyl halides react to give good yields when they react to Thiolates.

Sulfurs are more reactive than ethers.

Sulfur can form bonds with other atoms in a sulfide.
Sulfur forms strong bonds with oxygen, and sulfides can be easily converted to sulfoxides and sulfones.

The hydrogen peroxide/acetic acid combination is a good oxidizer.

One equivalent of peroxide oxidizes the sulfone.
The reagent combination probably reacts via the peroxyacid, which is formed in equilibrium with hydrogen peroxide.

Mild reducing agents like sulfides are often used because they are easy to oxidize.

dimethyl sulfide has been used to reduce the potentially explosive ozonides that result from ozonolysis of alkenes.

Sulfur compounds are more nucleophilic than oxygen compounds because sulfur is larger and more polarizable and its electrons are less tightly held in orbitals that are farther from the nucleus.

Although ethers are weak, sulfides are strong.

The salts are strong alkylating agents.

The carbon atom is polarized by the sulfonium salt.
An excellent leaving group is the one that expels an un charged sulfide after an attack by a nucleophile.
Sulfur lowers its energy in the transition state.

There are many alkylating agents in biological systems.

The SAM converts norepinephrine toadrenaline in the body.

The sulfur mustards were used in World War I. Nitrogen mustards are less toxic due to their ability to alkylate and alkylating agents on important metabolisms.

There is a mechanism to explain why mustard gas is so potent.

The cells are killed by inacti, a strong oxidizing agent.

Bleach is effective on organic stains because it oxidizes colored compounds to colorless compounds.

If we have a compound with two or more functional groups, and we want to modify one of them, we need to protect the other functional groups.

The alcohol group would cause the reaction to fail if we added a Grignard reagent to the carbonyl group.

Alcohol functional groups react with acids, bases, and oxidizing agents.

If alcohols are to survive a reaction at another functional group on the molecule, they must be protected.
To regenerate the original functional group, a good protecting group must be easy to remove.
We would need to convert the hydroxy group to something that is resistant to Grignard reagents to accomplish the reaction shown above.
An ether might be used to protect a group in a Grignard reaction.

It can be difficult to remove an ether protecting group.

It requires strong acid to react with the free hydroxy group.

Silyl ethers are easier to remove than carbon ethers.

Under gentle conditions, the fluoride ion can remove silyl ethers.

Synthetic organic chemists have developed many different silyl protecting groups that vary in reactivity and are carefully chosen for a specific use.

The three bulky isopropyl groups help keep the silyl ether stable.
Silyl ethers are formed by the reaction of alcohols with chlorosilanes.
chlorotriisopropylsilane can be reacted with a tertiary amine to form TIPS ether.

The alcohol shown above would give a protected alcohol with the help of TIPS chloride and triethylamine.

We can add a Grignard reagent to the carbonyl group in the presence of alcohol.

After the Grignard reaction is completed, the magnesium alkoxide salt and deprotection of the silyl ether give the desired product.

How would you use a protecting group to convert 4-bromobutan-1-ol to hept-5-yn-1-ol?

The formation of 14-11 Synthesis of Epoxides a silyl ether from a silyl chloride is usually exothermic.

Synthetic reactions are much stronger with F bonds.

It is being tested for use as a ing fastest with the peroxyacid epoxidation, with electron-rich double bonds react being tested.

The following reactions are difficult to make.
The toothpaste used in the second example is magnesium.

To avoid large-scale use of hazardous chlorinated solvents, these MMPP epoxidations are carried out at neutral pH.

A variation of the Williamson ether synthesis is a less common synthesis of ethers.

A ring may be formed if an alkoxide ion and a halogen atom are in the same molecule.

Alkenes can be treated with solutions of Halogens to generate halohydrins.

Double bonds are added with chlorine and bromide water.
The cyclopentene reacts with chlorine water to make chlorohydrin.
The chlorohydrin is treated with a caustic soda.

This reaction can be used to make larger rings.

The base is added to deprotonate the alcohol to prevent it from attacking the halide.
The hydroxy group can be deprotonated by 2,6-Lutidine, a bulky base that cannot easily attack a carbon atom.

Five-, six-, and seven-membered ethers are formed this way.

Three organic chemists won the 2001 chemistry prize for their work on asymmetric synthesis.

An asymmetric synthesis converts an achiral starting material into a chiral product.
The asymmetric epoxidation of allylic alcohols was developed by K. Barry Sharpless.

The followingoxidation of geraniol is typical.

A racemic mixture of enantiomers is formed when achiral reagents react to give a chiral product.

Because of the large strain energy associated with the three-membered ring, phestros are much more reactive than common dialkyl ethers.

Acid-catalyzed opening depends on the solvent used.

In Section 8-13, we saw that acid-catalyzed hydrolysis of epoxides gives glycols.

The mechanism of this hydrolysis involves the formation of a good leaving group and the attack by water.

The phe oxides open in acidic solutions.

The formation of a strong electrophile is accomplished by the protonsation of the epoxide.

Water opens the ring.

The diol is given by detonation.

An acidic solution of a peroxyacid can be used to oxidize an alkene.

It hydrolyzes to the glycol when it is formed.

A molecule of alcohol acts as the solvent when the acid-catalyzed opening of an epoxide takes place.

The reaction produces alcohol with anti stereochemistry.
This method is great for making compounds with ether and alcohol functional groups.

2-alkoxy alcohols are formed in acidic alcohol solutions.

The formation of a strong electrophile is accomplished by the protonsation of the epoxide.

The alcohol opens the ring.

The product is a 2-alkoxy alcohol.

A halide ion attacks the protonsated epoxide when it reacts with a hydrohalic acid.

This reaction is similar to the cleavage of ethers.
The halohydrin formed after HX gave it a 1,2-dihalide.
The 1,2-dihalide can be made by adding X2 to the alkene.

The acid-catalyzed opening of squalene-2,3-epoxide is believed to be involved in the production of steroids.

Lanosterol is converted to cholesterol and other steroids by the cyclized intermediate.

The acid-catalyzed opening of other epoxides is similar to the cyclization of squalene-2,3-epoxide.

The oxygen is attacked by a nucleophile.
The pi bond is the nucleophile.
The initial result is a tertiary carbocation.

cyclization of the carbon skeleton is promoted by the opening of this epoxide.

Lanosterol is converted to other steroids after the cyclized intermediate is converted.

The acid-catalyzed opening of the epoxide is the beginning of cyclization.

Another carbocation is formed by each additional cyclization step.

A compound with four rings and seven used in antifungal drugs is made from achiral, a starting material of squalene epoxidase.

The sequence has high yields lete's foot, jock itch, ringworm, and complete stereospecificity.

An alkoxide ion is a poor leaving group, so most ethers don't undergo nucleophilic substitution or eliminations.

The ring strain that is released upon opening is enough to compensate for the poor alkoxide leaving group.
The ether has a lower activation energy than the starting epoxide, which has a higher energy than ether.

The same product as the acid-catalyzed opening of the epoxide is produced by the same reaction.

Under milder conditions, the acid-catalyzed reaction may be used to open an epoxide.
The acid-catalyzed hydrolysis is preferred if there is an acid-sensitive functional group present.

Alkoxide ion react with epoxides to form ring-opened products.

The same trans-2-methoxycyclopentanol is produced in the acid-catalyzed opening in methanol when cyclopentene oxide reacts with sodium methoxide.

Most ethers are not attacked or cleaved by strong bases and nucleophiles.

The strain of the three-membered ring is relieved by opening the epoxide.
Even though the leaving group is an alkoxide, strong bases can attack.

The ring is opened by a strong base attack.

The diol comes from the alkoxide.

Amine can open epoxides.

Ethanolamine is an important industrial reagent when ene oxide reacts with ammonia.
Diethanolamine and triethanolamine can be given by the nitrogen atom in ethanolamine.
Excess ammonia can be used to achieve good yields of ethanolamine.

There is a complete mechanism for the reaction of cyclopentene oxide with sodium methoxide.

Predict the major product when each reagent reacts.

The same product can be found in both the acid-catalyzed and base-catalyzed ring openings.

Different products may be produced under acid-catalyzed and base-catalyzed conditions.

The less carbon atom is attacked by the alkoxide ion under basic conditions.

The alcohol attacks the protonsated epoxide.

It might seem that alcohol would attack at the less hindered oxirane carbon, but this is not the case.

There is a balancing act between ring strain and the energy it costs to put some of the positive charge on the carbon atoms.

If the ring started to open, we could use resonance forms to show what the cations would look like.
The "no-bond" resonance forms help us to see the charge distribution.

The structures I and III show that the oxirane carbon atoms share part of the positive charge.

structure I is more important than structure III because the tertiary carbon bears a larger part of the positive charge.

The lower transition state energy for attack at the tertiary carbon is implied by the weaker bond between the tertiary carbon and oxygen.
Attack by the weak nucleophile is sensitive to the strength of the electrophile, and it occurs at the tertiary carbon.

The opening of a bromonium ion in the formation of a bromohydrin and the opening of the mercurinium ion during oxymercuration are similar to this ring opening.

All three reactions involve the opening of a ring.
Attack takes place at the more carbon atom, which is the more carbon that supports the positive charge.
Most base-catalyzed epoxide openings involve attack by a strong nucleophile at the less hindered carbon atom.

The less substituted carbon is less hindered by base-catalyzed attacks.

The alcohol attacks the tertiary carbon atom of the protons.

Predict the major products of the reactions.

ethylmagnesium bromide reacts with oxirane to form magnesium salt of butan-1-ol.

The neutral alcohol is given by particleation.

Substituted epoxides can be used in this reaction, with the carbanion usually attacking the less hindered epoxide carbon atom.

If one of the oxirane carbons is unsubstituted, this reaction will work best.
The less hindered epoxide carbon atom is attacked by Organolithium reagents.
Depending on the strength of the carbon atom, Grignard reagents may give a mixture of products.

The bread is held together by the stickyCarbohydrate in wheat.

Hide glue is made from animal hides and hooves.
For hundreds of years Hide glue has been used for wood and paper gluing, and it is still used for fine musical instruments and other articles that are easy to take apart without damaging the wood.
The bond quickly fails in a damp environment if Hide glue is watersoluble.
As it dries, it shrinks to a fraction of its wet volume.
The casein glues were developed to give a stronger bond.
A casein glue is as strong as most woods and will resist water for hours.
It doesn't fill gaps and it doesn't work with metals and plastics.

Imagine a glue that doesn't shrink when it's hardened and fills gaps so that pieces don't need to be fitted closely.

It holds forever in water, is strong, and sticks to anything: wood, metal, plastic, etc.
It lasts forever on a Harrier II jet into an autoclave where the shelf is not hardened, but it is quickly hardened once the pieces are in place.
It can be made so that it fills tiny voids or thick and pasty so that it stays in place.

The carbon-epoxy Epoxies are put in place so that they match the shape of the joint, and the adhere composite is used to make aircraft.

There is no solvent that can evaporate so there are parts that are as strong as steel.
Thepoxies are unaffected by water.

Epoxies use a prepolymer that can be made as gummy as desired, and they use a hardening agent that can be modified to control the curing time.

They have a long shelf life without the hardening agent.

China has become the largest manufacturer and consumer of the resins, which have grown to a market of about $20 billion.

An ahydrlkoxide that snaps shut on the other end is formed under base-catalyzed conditions.

The second epoxide reacts with another molecule.

Two molecules of epichlorohydrin can be reacted with each molecule of bisphenol A.

The effects would continue until the polymerization chains were long, and the material would be of estrogens, which can lead to a solid material.

Excess epichlorohydrin is added to health effects at high enough levels to form short chains with epichlorohydrins on both ends.
There are shorter chains and a runny prepolymer with the use of BPA.
Some of the plastic linings of canned prepolymer can be made with less epichlorohydrin.

When you buy glues, they come in two parts: the prepolymer and the hardener.

The hardener can be any of a wide variety of compounds with bottles and canned food.
The most common hardeners are polyamines.
The liners contain a hardener that can attack the terminal epoxide group and cause a chain reaction.

The hardener can deprotonate a hydroxy group from the inside of a chain.

The network of the final polymer is strong and resistant to chemical attack.

The less highly substituted carbon bonds to the alkoxy group.

Oxygen is used in the air to oxidize.

hydroperoxides and dialkyl peroxides are produced by Autoxidation of ethers.

Bond breaking and bond forming is a reaction that takes place in one step.

The loss of a small molecule such as water or an alcohol can cause a reaction that joins two or more molecules.

A large polyether is used to make complex and solvate cations.

The alkene is usually treated with a peroxyacid.

A compound with three members.

Most often, they are formed by condensation of epichlorohydrin with a dihydroxy compound.

A compound with two carbon atoms and a hydroxy group.

Most of the time, chlorohydrins, bromohydrins, and iodohydrins are found.

One or more of the ring atoms in the compound are elements other than carbon.

An abbreviation for magnesium monoperoxyphthalate, a stable peroxyacid used in large-scale epoxidations.

A compound with a four-membered ether.

The oxygen-oxygen bond is easy to cleave and prone to explosions.

A group used to prevent a group from reacting when another part of the molecule is being modified.

The protecting group was removed.
An alcohol can be converted to a silyl ether to protect it against acids and bases.
Bu4N+ F- protects the alcohol.

One of the alkyl groups of an ether has been replaced by a substituted Silicon atom.

It was used to protect groups from alcohols.
It's used to protect alcohol groups.

It was formed from alcohol and tertiary amine.

Aqueous fluoride salts are used to protect.

R' can be seen below.

A salt with a sulfur atom bonding to three alkyl groups.

R' can be seen below.

It must be primary or occasionally secondary.

Each skill is followed by problem numbers.

Draw and name ethers.

Determine the structure of ethers and predict their characteristics.

The following compounds have common names.

The IUPAC names for the compounds should be given.

Glycerol has a boiling point of 290 degC and a density of 1.24 g>mL.

A liquid that flows easily has a boiling point of 180 degrees and a density of 0.88 grams.
Draw the structures of the two compounds and explain why glycerol has a higher boiling point and density.

Show how you would make the ethers using simple alcohols and reagents.

A graduate student is working in a laboratory.

He needed some diethyl ether for a reaction, so he opened an old, rusty 1-gallon can and found half a gallon left.
The student went to the stockroom to get the other reagents he needed to purify the ether.
A worker from another lab put out a fire when he returned to his lab.
The ceiling contained most of the apparatus.

Grignard reactions can be limited by steric hindrance.

While Grignard reagents react in high yield with ethylene oxide and monosubstituted epoxides, yields are often lower with disubstituted epoxides.
If at all, tri- and tetrasubstituted epoxides react with difficulty.

Show how to make alcohols by a Grignard.

The mass spectrum of 2-methoxypentane has a number of strontium strontium strontium strontium strontium strontium strontium strontium strontium strontium strontium

The acid-catalyzedization of squalene oxide is similar to the following reaction.

There is a mechanism for this reaction.

How would you convert pent-1-ene to these compounds?

You can use any additional reagents and solvents.

LiAlH4 and Grignard reagents react with carbonyl compounds to give alkoxide ion intermediates.

The alkoxides can give ethers if they react with 1deg or methyl alkyl halides.

The structures of the intermediates are represented by letters.

Following by hydrolysis is 3.

She forgot to mark the vials she used to collect fractions during the process of isolating the product.
A product of formula C4H O boiled at 35 degrees.

Provide a structure for this product, explain how it corresponds to the observed spectrum, and suggest how the student isolated this compound.

Show how you would make the following ethers with the indicated starting materials and any additional reagents.

How would you convert 3-bromocyclohexanol to the following diol?

You can use any additional reagents.

There are two different ways to make 2-ethoxy-octane.

When pure (-)@octan@2@ol of specific rotation -8.24deg is treated with sodium metal and then ethyl iodide, the product is 2-ethoxyoctane with a specific rotation of -18.6deg.
When pure (-)@octan@2@ol is treated with tosyl chloride and pyridine, the product is also 2-ethoxyoctane.
Predict the rotation of the 2-ethoxyoctane made using the tosylation/sodium ethoxide procedure and propose a detailed mechanism to support your prediction.

The major product when treated with anhydrous HBr gas is 1,2-dibromoethane.

The major product of treated ethylene oxide is ethylene glycol.
There are mechanisms that can be used to explain the results.

Under base-catalyzed conditions, several molecules of propylene oxide can react.

The base-catalyzed formation of the following trimer is proposed.

An acid-catalyzed reaction was carried out using a solvent.

The higher-boiling fraction was recovered when the 2-methoxyethanol was redistilled.
The mass spectrum of this fraction showed the weight.
The IR and NMR spectrums are shown here.
Determine the structure of this compound and propose a mechanism for its formation.

There is a molecule of two different colors.

Thelysis of propylene oxide gives another molecule.

The enantiomers of propylene oxide can be drawn.

There is a compound of molecular formula C8H O.

The product shown is allylic alcohol.

There is a mechanism to explain this reaction.

1,1-diphenyloxirane undergoes a smooth conversion under mild acid catalysis.

There is a mechanism for this reaction.

Propose a way to do something.

The functional groups have oxygen in them.

The number of stereoisomers can be calculated using the number of chiral centers.

In 2012 a group led by Professor Masayuki Satake of the University of Tokyo reported the isolation and structure determination of a toxin from a marine bloom that decimated the fish population off the New Zealand coast in 1998.

The structure shown below, named Brevisulcenal-F, is the result of extensive mass spectrometry and NMR experiments.

This structure has the record for the largest number of fused rings.

The alcohols are either 1deg or 2deg.