HERBICIDAL SULFONAMIDES, THEIR PREPARATION, COMPOSITIONS CONTAINING THEM AND USE THEREOF

摘要

Herbicidal suifonamides and the preparation and use thereof, the sulfonamides having the general formula wherein or R2 and R3 are independently hydrogen, fluorine, chlorine, bromine, methyl, methoxy, nitro or trifluoromethyl; W is oxygen or sulfur; X is -NHCH3 or -N(CH3)2; Z is methyl or methoxy; and A is @ or N or its agriculturally suitable salts provided that when R2 is nitro or trifluoromethyl, R3 cannot be nitro or trifluoromethyl. The compounds can be formulated into compositions for agricultural use by conventional means. The compounds are useful for the regulation of plant growth and as herbicides, particularly for controlling volunteer corn in soybeans. They can be prepared by reacting an appropriate 2-amino-heterocycle with an appropriately substituted sulfonyl isocyanate or isothiocyanate.