Novel thiadiazole compounds are produced having the following general formula: ##STR1## wherein X is S or SO.sub.2 R.sub.1 is a lower alkyl (cyclic or non-cyclic) radical R.sub.2 is hydrogen or a lower acyclic hydrocarbon radical R.sub.3 is a lower acyclic hydrocarbon or cycloalkyl radical or alkoxy radical, and R.sub.4 is hydrogen, a lower acyclic hydrocarbon radical or cycloalkyl radical, provided R.sub.3 and R.sub.4 are not both cycloalkyl, and [B] Tautomers of [A] wherein R.sub.2 is hydrogen. Synthesis of these compounds is disclosed, including synthesis of those compounds which exhibit tautomerism. The compounds show particular utility as agricultural pesticides and most favorably as herbicides.
新型
噻二唑类化合物具有以下一般式:##
STR1## 其中 X 是 S 或 SO.sub.2,R.sub.1 是较低的烷基(环状或非环状)基,R.sub.2 是
氢或较低的非
环烃基,R.sub.3 是较低的非
环烃基或
环烷基或烷
氧基,R.sub.4 是
氢、较低的非
环烃基或
环烷基,前提是 R.sub.3 和 R.sub.4 不能同时是
环烷基,以及[A]的[B]异构体,其中 R.sub.2 是
氢。公开了这些化合物的合成方法,包括那些表现出互变异构的化合物的合成方法。这些化合物在农业
杀虫剂中表现出特殊的效用,最好是作为
除草剂。