3-Aminobenzoic Acid → Benzoic acid, 3-[[(methylamino)thioxomethyl]amino]-

Participants

Reaction Conditions

Reaction Steps

A mixture of 279.6 9 of 3-amino-benzoic acid, 164.1 g of methyl isothiocyanate and 1000 g of 100% acetic acid is heated to 80-85° C. The temperature rises to 95-100° C. in the course of 20 minutes without further heating, and a clear solution from which the product slowly crystallizes out forms. The suspension is kept at 90-100° C. for 2 hours, subsequently cooled to 15-20° C. and filtered with suction and the material on the suction filter is washed with acetic acid. 404 g of the title compound result, purity: 99.5%, melting point: 190-91° C., decomposition. Yield: 95.7% of theory.

Provenance & Evidence