Question

Convert benzoic acid to phenylacetic acid

Answer 1

Benzene can be converted into benzoic acid as follows;

Step 1: Conversion of benzene into benzaldehyde.
Benzene on treatment with CO and HCL in presence of anhydrous
AlCl3, formylation takes place to give benzaldehyde.

Step 2: Convertion of benzaldehyde into benzoic acid.

Benzaldehyde is oxidised by acidified KMNO4 to form benzoic acid.

Answer 2

Dear friend,

Synthesis of phenylacetic acid from Benzoic acid:

Benzoic acid can react with thionyl chloride(SOCl2) to give Benzoyl chloride. Then Benzoyl chloride can react with diazomethane to offer diazo ketone. Within the presence of Water and a Metal catalyst(silver oxide), it will give phenylacetic acid as a desired product. The Arndt-Eistert reaction is employed to convert the Benzoic acid to phenylacetic acid.

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