Flazasulfuron: alcoholysis, chemical hydrolysis, and degradation on various minerals.

The herbicide flazasulfuron undergoes rapid alcoholysis. High yields of the corresponding carbamate and aminopyrimidine are obtained after the alcoholysis process (methanol or ethanol) at 30 degrees C, in the course of which the concomitant rearrangement reaction remains minor. Hydrolysis (pH ranging from 5 to 11) of flazasulfuron at 30 degrees C principally involves the rearrangement into urea after elimination of SO(2) and can lead, in a small proportion, to both aminopyrimidine and pyridinesulfonamide.