Process for the manufacture of thiochloroformates

Details Process for the manufacture of thiochloroformates Process for the manufacture of thiochloroformates

B - Operations, Transporting

01

J

260/467

B01J 31/02 (2006.01)

Patent

CA 1161457

SOCIETE NATIONALE DES POUDRES ET EXPLOSIFS PATENT APPLICATION Process for the manufacture of thiochloroformates Inventors: Julien DEWEERDT Jaeques SALA Denis SOUYRI ABSTRACT According to the invention, phosgene is reacted with a mercaptan in the presence of a catalyst of the general formula: Image in which X = O or S and in which R1, R2, R3 and R4 are, in particular, aliphatic, cycloaliphatic or aromatic groups or a hydrogen atom. The proportion of catalyst is 0.1 to 10 mol %, relative to the mercaptan, and the reaction is carried out at ambient temperature and at atmospheric pressure. The process, which can be made continuous, results in short residence times and in a high yield and a high purity. Thiochloroformates are applied essentially as intermediates for the synthesis of herbicidal compounds.

391360

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