Benzoic Acid → Benzoyl chloride

Participants

Reaction Steps

The procedure described in Example 1 was used and was applied to a solution of 1 mol of benzoic acid in 140 g of xylene. The reaction was carried out in the presence of 10 mmols of N-butyl-4-pyridone. 120 g of phosgene were introduced in the course of 2 hours 40 minutes. The yield obtained after distillation is 98.5%. Infra-red spectrometry did not reveal any trace of benzoic anhydride in the residue. The latter was recycled and a further batch of one mol of benzoic acid was introduced into the reactor. 120 g of phosgene are introduced in the course of 3 hours and the usual cycle is followed. A yield of 96% of benzoyl chloride was obtained after distillation. The residue still showed no traces of anhydride in infra-red spectrometry.

Provenance & Evidence