Photolysis of dimepiperate in aqueous solution

摘要

AbstractDimepiperate,S‐(1‐methyl‐1‐phenylethyl) piperidine‐1‐carbothioate (I) was degraded in aqueous solution by ultraviolet irradiation into piperidine (II), α‐methylstyrene (III), acetophenone (IV), and formaldehyde (V). The reaction followed first‐order kinetics. In sunlight the reaction occurred only in the presence of a sensitiser and afforded the same four photolytic degradation products. In the absence of oxygen the herbicide was converted much more rapidly, but yielded only (II) and (III) as products. A mechanism which accounts for the formation of the photoprod