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  • How will you bring about the following conversions in not more than two steps? (ii) Benzoic acid to Benzaldehyde

Q 12.15     How will you bring about the following conversions in not more than two steps?

         (ii)     Benzoic acid to benzaldehyde

Answers (1)

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With the help of mild reducing agent we can reduce benzoic acids into benzaldehyde.

you can reduce benzoic acid into benzaldehyde using a mild reducing agent, such as Lindlar's catalyst, in a two-step process:

  1. 1. Convert benzoic acid to benzoyl chloride

    Use a chlorinating agent like phosphorus pentachloride (PCl5) or thionyl chloride (SOCl2) to replace the hydroxyl group of benzoic acid with a chlorine atom. This forms benzoyl chloride.

  2. 2. Reduce benzoyl chloride to benzaldehyde

    Use Lindlar's catalyst, which is palladium (Pd) supported on barium sulfate (BaSO4), along with hydrogen gas (H2) to reduce the benzoyl chloride to benzaldehyde. This process is called Rosenmund's reduction. The chlorine atom is replaced by a hydrogen atom. 

Benzaldehyde is a colorless liquid with an almond-like odor. It's used in cherry-flavored sodas and as a flavoring agent in imitation almond extract.

alternate method-


First react it with SOCl_{2} which replace OH group and then hydogenation reaction.

Posted by

manish

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