Dimethylformamide → 1,2,3-Benzothiadiazole-7-carbonyl chloride

Participants

Reaction Steps

290 g of benzo-1,2,3-thiadiazole-7-carboxylic acid are suspended in 1.6 l of toluene, 3.5 ml of dimethylformamide and 129 ml of thionyl chloride are added and the mixture is stirred at 80°-900° C., the suspension turning into a solution as the release of gas progresses. When the reaction has ended, the solution is cooled and filtered over a little Hyflo, the residue is rinsed with toluene and the filtrate is evaporated. 297 g (93%) of crude acid chloride, which can be further reacted directly, result.

Provenance & Evidence