Thiophenesulfonamide herbicides.

摘要

Thiophenesulfonamides of the formula <CHEM> wherein R1 is H, halogen, NO2, CH or various aliphatic groups; Rx is H or halogen; Q is selected from halogen, CN, SO2NH2 or a variety of organic substituents; W is O or S; R is H or CH3; A is a mono- or bicyclic heterocyclic group, e.g. triazinyl or pyrimidinyl; and their agriculturally suitable salts exhibit herbicidal activity. Some also show a plant growth regulant effect. The compounds may be made by a variety of synthetic routes, e.g. by reacting an appropriate thiophenesulfonamide of formula:- <CHEM> with an appropriate methyl carbamate CH3O.CO.NRA. n