C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 417/12 (2006.01) C07D 277/36 (2006.01) C07D 277/78 (2006.01)
Patent
CA 2053383
Abstract: The process for the preparation of 2-(amino- dithio)thiazoles and 2-(aminotrithio)thiazoles by react- ing a mixture of a 2-mercaptothiazole or a dithiazolyl 2,2'-disulphide with a saturated secondary heterocyclic amine and sulphur in a reaction medium containing an inert organic solvent in the presence of an oxidant is characterised in that the reaction is carried out in the presence of ammonia and a catalyst containing copper, a copper compound or a cerium compound, and in that the oxidant is molecular oxygen or a gas containing this oxygen. In particular, 2-(4-morpholinodithio)benzothia- zole, which is technically interesting as a vulcanisation accelerator, can be prepared in high product yield and virtually without by-products using the oxidant which is less expensive and can be handled with greater ease.
Bergfeld Manfred J.
Eisenhuth Ludwig
Akzo N.v.
Swabey Ogilvy Renault
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