Question

Of the following which derivatives are prepared for phenol , alcohol and amine *

Acetyl derivative

Benzoyl derivative

None of these

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Answer 1

Answer:

Benzoyl derivative

Explanation:

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Answer 2

Answer:

The answer is (b) Benzoyl derivative

Explanation:

The introduction of the benzoyl group ( $C_{6}H_{5}CO$ ) into a compound is known as Benzoylation

• In this reaction, the  Benzoyl chloride reacts with compounds having an active hydrogen atom such as alcohols, phenols, amines, etc. in the presence of sodium hydroxide ( $NaOH$ ) or pyridine

• The active hydrogen present in the compound is replaced by the benzoyl $C_{6}H_{5}CO-$ group.

• This reaction is also known as the Schotten-Baumann reaction

$C_{6}H_{5}OH + C_{6}H_{5}COCl$   →  $C_{6} H_{5}.O.OC_{6}H_{5} + HCl$

$C_{2}H_{5}OH + C_{6}H_{5}COCl$   →  $C_{2}H_{5}O.OC.C_{6}H_{5} + HCl$

$C_{6}H_{5}NH_{2} + C_{6}H_{5}COCl$  →  $C_{6}H_{5} NH.CO.C_{6}H_{5} + HCl$

$C_{2}H_{5}NH_{2} + C_{6}H_{5}COCl$  →   $C_{2}H_{5} NH.CO.C_{6}H_{5} +HCl$

These benzoyl derivatives are crystalline compounds and on hydrolysis give back the original active hydrogen compound.

Benzoylation is therefore used to protect these groups