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Question
How is phenol prepared from cumene?
Solution
Preparation of phenol from cumene:
a. When an alkaline solution of cumene (isopropyl benzene or 2-Phenylpropane) in sodium carbonate is oxidised by passing air or oxygen in the presence of cobalt naphthenate as a catalyst at 423 K, cumene hydroperoxide is obtained.
b. Auto oxidation: Cumene hydroperoxide on heating with dilute H2SO4 decomposes forming phenol and acetone. In this method, acetone is obtained as an important byproduct which is separated by distillation.
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