Alcoolyse et hydrolyse chimique acide du chlorsulfuron

Alcoholysis and acid chemical hydrolysis of chlorsulfuron Alcoholysis of chlorsulfuron by methanol or ethanol only involved the urea function of the molecule. The formation of carbamate indicated that isocyanate was probably involved as an intermediate. The chemical degradation of chlorsulfuron in acidic aqueous solution involved two pathways: hydrolysis of the urea function and hydrolysis of the methoxy radical. Increasing the temperature from 25 to 55°C en-hanced the rate of the reaction and favoured hydrolysis of the urea function. Decreasing the pH from 6-0 to 2-4 strongly accelerated degradation and lowered the activation energy without affecting selectivity. Other factors, such as the presence of clays or cations of various transition metals, generally had only limited effects.