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Image for Tertiary alcohols with two identical alkyl groups attached to the alcohol carbon can be made either from a

43. Tertiary alcohols with two identical alkyl groups attached to the alcohol carbon can be made either from an ester and two moles of a Grignard reagent, or from a ketone and one mole of a Grignard reagent. Use retrosynthetic analysis to suggest one path of each type to synthesize 1,1-diphenylethanol. (Click and drag the appropriate image to the correct position in the following reactions.)

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Answer #1
Concepts and reason

This problem is based on the concept of alcohol formation by different methods using Grignard reagent.

Grignard reagent undergoes reaction with ester and carbonyl compounds (ketones and aldehydes) in order to form the compounds containing hydroxyl group (OH)
ОН)
which are called alcohols.

Fundamentals

Grignard reagent attacks on the electrophilic carbon of carbonyl group (C=0)
of ketone and ester group (COOR)
in order to form an anion which has negative charge on oxygen atom, further which undergoes hydrolysis to form tertiary alcohols.

The given structure of the compound is shown below.

НО

The structure of the ester and Grignard reagent are given below:

-MgBr
TO CH3

The structure of the ketone and Grignard reagent are given below:

H3C—MgBr

Ans:

Representation of route 1 to form tertiary alcohol is given below:

OH
H30+
had
+
2
-MgBr
OCH3

Representation of route 2 to form tertiary alcohol is given below:

ОН
Но+
К
+
H3C
— MgBr
—
—

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