3,5-Dichlorobenzoic acid → 3,5-Dichlorobenzoyl chloride

Participants

Reaction Steps

49.4 g of thionyl chloride and 0.21 g of pyridine were added to 20 g of 3,5-dichlorobenzoic acid and the mixture was refluxed for 20 hours. Excessive thionyl chloride was removed by distillation. Dry hexane was added to the residue and an insoluble matter was filtered out of the resulting solution and hexane was removed under reduced pressure. The remaining solution was crystallized. 3,5-Dichlorobenzoyl chloride was obtained quantitatively.

Provenance & Evidence