PROCESS FOR THE PREPARATION OF BETA-(BENZOTHIAZOLYLTHIO) AND BETA (BENZIMIDAZOLYLTHIO)CARBOXYLIC-ACID DERIVATIVES
The reaction of 2-mercapto-benzothiazole or -benzimidazole with alpha , beta -unsaturated carboxylic acid derivatives in a strongly acid reaction medium gives compounds of the formula I I in which X is sulfur or NH, each radical R independently of one another is H, alkyl, halogenalkyl, alkoxy, alkyl...
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