Predict the products you expect when the following starting material undergoes oxidation with an excess of each of the reagents shown below.

(a)chromic acid

(b)PCC(pyridinium chlorochromate)

(c)sodium hypochlorite/ acetic acid

(d)DMSO and oxalyl chloride

(e)DMP(periodinane)reagent

Short Answer

Expert verified

The number of C-O bonds can be counted to understand whether an oxidation or reduction reaction has happened. The C-H bonds are transformed into C-O bonds in reduction reactions.

Step by step solution

01

Oxidation

The number of C-O bonds can be counted to understand whether an oxidation or reduction reaction has happened. The C-H bonds are transformed into C-O bonds in reduction reactions.

02

Oxidation of alcohols

Oxidation of primary alcohols generates an aldehyde. Ketones are generated when secondary alcohols are subjected to oxidation. NaOCl and chromic acid can be used to perform this kind of reaction.

03

Products formed when the given starting material undergoes oxidation with the given reagents

(a)The primary alcohol is oxidized to carboxylic acid when the starting material is treated with chromic acid (H2CrO4). The reaction can be given as:

The treatment of the starting material with chromic acid

(b)The primary alcohol is oxidized into an aldehyde when the starting material is treated with PCC. The reaction can be given as:

The treatment of the starting material with PCC

(c)The treatment of the starting material with NaOCl oxidizes the primary alcohol into a carboxylic acid. The reaction can be given as:

The treatment of the starting material with NaOCl

(d)The treatment of the starting material with DMSO or oxalyl chloride oxidizes the primary alcohol into an aldehyde. The reaction can be given as:

The treatment of the starting material with DMSO or oxalyl chloride

(e)The treatment of the starting material with DMP oxidizes the primary alcohol into an aldehyde. The reaction can be given as:

The treatment of the starting material with DMP

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Most popular questions from this chapter

Trichloroisocyanuric acid, TCICA, also known as “swimming pool chlorine,” is a stable solid that oxidizes alcohols, following a mechanism similar to oxidation by HOCl. No reaction occurs between TCICA and the alcohol (in a solvent such as acetonitrile) until one drop of HCl(aq) is added, whereupon the reaction is over in a few minutes. Write the mechanism for this oxidation that shows the key role of the acid catalyst. Show the oxidation of just one alcohol, not three. (Hint: The carbonyls are the most basic sites on TCICA.)

A student wanted to use the Williamson ether synthesis to make (R)-2-ethoxybutane. He remembered that the Williamson synthesis involves an SN2 displacement, which takes place with inversion of configuration. He ordered a bottle of (S)-butan-2-ol for his chiral starting material. He also remembered that the SN2goes best on primary halides and tosylates, so he made ethyl tosylate and sodium (S)-but-2-oxide. After warming these reagents together, he obtained an excellent yield of 2-ethoxybutane.

(a) What enantiomer of 2-ethoxybutane did he obtain? Explain how this enantiomer results from the SN2 reaction of ethyl tosylate with sodium (S)-but-2-oxide.

(b) What would have been the best synthesis of (R)-2-ethoxybutane?

(c) How can this student convert the rest of his bottle of (S)-butan-2-ol to (R)-2-ethoxybutane?

Predict the major products of the following reactions.

(a)ethyl tosylate+potassium tert-butoxide

(b) isobutyl tosylate + NaI

(c) (R)-2-hexyl tosylate + NaCN

(d) the tosylate of cyclohexylmethanol +excess NH3

Unlike ethylene glycol, propylene glycol (propane-1, 2-diol) is non toxic because it oxidizes to a common metabolic intermediate. Give the structures of the biological oxidation products of propylene glycol.

Show how you would synthesize the following compound. As starting materials, you may use any alcohols containing five or fewer carbon atoms and any necessary solvents and inorganic reagents.

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