Why is thionyl chloride (SOCl 2 ) preferred for converting carboxylic acids to acyl chlorides over PCl 5 and PCl 3 ?

Question

Why is thionyl chloride (SOCl 2 ) preferred for converting carboxylic acids to acyl chlorides over PCl 5 and PCl 3 ?, Thionyl chloride is less expensive., Thionyl chloride produces fewer byproducts., PCl 5 and PCl 3 are gaseous and escape the reaction mixture., PCl 5 and PCl 3 are more reactive.

MARKS App · Accepted Answer

Thionyl chloride (SOCl 2 ) is preferred because PCl 5 and PCl 3 , when used for the same reaction, produce gaseous byproducts that escape the reaction mixture, making it difficult to handle and purify the desired product.

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