Pyridinsulfonylurinstofderivater, middel til kontrol med væksten af uønsket vegetation, fremgangsmåde til kontrol med væksten af sådan vegetation sammt mellemprodukter til fremstilling af de nævnte derivater

摘要

Pyridinesulfonylureas of general formula: wherein J is a substituted pyridyl group; W is O or S; R is H or CH3; A is a mono- or bicyclic heterocyclic group, e.g. pyrimidinyl or triazinyl; and their agriculturally suitable salts show high activity as preemergence and postemergence herbicides. some also show a plant growth regulant effect. The novel compounds may be made e.g. by reacting an appropriate pyridine sulfonamide JSO2NH2 with an appropriate heterocyclic phenyl carbamate:- t