COMBATING UNWANTED VEGETATION WITH 1,3,4- THIADIAZOLE-2-SULFONAMIDES

COMBATING UNWANTED VEGETATION WITH 1,3,4-THIADIAZOLE-2-SULFONAMIDES The industrial herbicide 5-(1,3,3-trimethyl-ureido)-N,N-dimethyl-1,3,4-thiadiazole-2-sulfonamide and other compounds of similar structure may be made by a novel procedure in which the first step is the oxidative chlorination of a 2-alkylamino-5-mercapto-1,3,4-thiadia-zole to yield the corresponding sulfonyl chloride. The subject compound which possesses five methyl substituent groups is more effective as a herbicide than compounds which contain other alkyl substituents or a lesser number of methyl substituents.