2-Alkoxy-5-amino- and -5-arenesulphonamido-1,3,4-thiadiazoles and related compounds
作者:R. Clarkson、J. K. Landquist
DOI:10.1039/j39670002700
日期:——
2-Alkoxy-5-amino-1,3,4-thiadiazoles are obtained by the action of cyanogen halides on alkoxythiocarbonylhydrazines, or by reaction of thiosemicarbazides with dialkoxymethylenimines. The latter process may also give 5-amino- or 5-alkoxy-1,2,4-triazole-3-thiols. Acylation of the aminothiadiazoles with arenesulphonyl chlorides gives 2-alkoxy-5-arenesulphonamido-1,3,4-thiadiazoles or 2-alkoxy-4-arenes
Herbicidal thiadiazole ureas are provided wherein the 5-position of the thiadiazole ring is hetero substituted and which exhibit enhanced selective herbicidal activity.