Sulfuric Acid → 2-Chloro-5-bromo-[(beta-chloroethyl)-sulfonylmethylamino]-benzoic acid

Participants

Reaction Conditions

Reaction Steps

1 ml of concentrated sulfuric acid, followed by 9.6 g (60 mmoles) of hydroxymethyl-(β-chloroethyl)-sulfone were added at 60° C, whilst stirring, to a filtered solution of 12.6 g (50 moles) of 2-chloro-5-bromo-3-aminobenzoic acid in 150 ml of hot acetonitrile. The mixture was stirred for a further 2.5 hours at 50° C and was then cooled to 10° C, and the product which had precipitated was filtered off. It was rinsed with water and dried in air. 15 g (77% of theory) of 2-chloro-5-bromo-[(β-chloroethyl)-sulfonylmethylamino]-benzoic acid were obtained in the form of a yellow powder of melting point 164° C (with decomposition).

Provenance & Evidence