Process for the preparation of thiazolesulphenamides

Claim 1

In a process for the preparation of a thiazolesulphenamide of the formula: ##STR6## in which R 1 and R 2 , which may be identical or different, are each hydrogen, halogen, alkyl of 1 to 5 carbon atoms, alkoxy of 1 to 5 carbon atoms, or aryl of 6 to 12 carbon atoms, or together form a divalent radical of the formula: ##STR7## in which R', R", R"' and R"", which may be identical or different, are each hydrogen, halogen, nitro, alkyl of 1 to 5 carbon atoms, alkoxy of 1 to 5 carbon atoms, or aryl of 6 to 12 carbon atoms, and R 3 and R 4 , which may be identical or different, are each hydrogen atoms, a straight or branched alkyl of 1 to 20 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, or aralkyl of 7 to 15 carbon atoms, or, together with the nitrogen atom to which they are bonded, form a heterocyclic ring of 5 to 7 ring atoms of which 1 to 3 are hetero-atoms chosen from nitrogen, oxygen and sulphur and the remainder are carbon atoms, the said ring being unsubstituted or substituted by alkyl of 1 to 5 carbon atoms or alkoxy of 1 to 5 carbon atoms, by condensing a 2-mercapto-thiazole of the formula: ##STR8## or a 2,2'-dithiazolyl disulphide of the formula: ##STR9## with a compound of the formula: ##STR10## R 1 , R 2 , R 3 and R 4 having the meanings given above, in the presence of oxygen and a catalyst, the improvement which consists in using, as catalyst, copper, copper oxide, a salt of copper with an inorganic acid, a carboxylic acid, or a sulphonic acid, or a copper β-diketonate chelate.