Concept explainers
(a)
Interpretation:
The major product of the given reaction is to be stated.
Concept introduction:
The reaction of an ester with excess Grignard reagent followed by hydrolysis converts an ester into tertiary alcohol through tetrahedral intermediate. The Grignard reaction takes place in three steps. The first step is addition of Grignard reagent. The second is elimination of alkoxide followed by formation of
(b)
Interpretation:
The synthesis of
Concept introduction:
The reaction of an ester with excess Grignard reagent followed by hydrolysis converts an ester into tertiary alcohol through tetrahedral intermediate. The Grignard reaction takes place in three steps. The first step is addition of Grignard reagent. The second is elimination of alkoxide followed by formation of ketone. The third step is addition of another Grignard reagent followed by formation of an alkoxide. The fourth step is hydrolysis of an alkoxide to yield tertiary alcohols.
(c)
Interpretation:
The preparation of Lexan with the use of diethyl carbonate instead of phosgene and the preparation of Sevin (an insecticide) with the use of diethyl carbonate instead of methyl isocyanate are to be stated.
Concept introduction:
Diethyl carbonate is an ester (carbonic acid and ethanol). It is a liquid reagent that is easy to handle. However, phosgene is a corrosive and highly toxic. Diethyl carbonate successfully replaces phosgene in the synthesis of Lexan and Sevin.
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EP ORGANIC CHEMISTRY -MOD.MASTERING 18W
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