Product studies and laser flash photolysis of direct and 2,4,6-triphenylpyrylium—zeolite Y photocatalyzed degradation of fenvalerate

Direct irradiation of fenvalerate (FV) in aqueous solution (4 × 10−3 M) gives rise to 2,3—diarylisohexanitrile through the homolytic CO—CH(i-Pr) bond cleavage, followed by a rapid decarboxylation of the primary carbonyloxy radical, and radical recombination. The unusual exclusive formation of the cross combination product suggests that the persistent free radical effect is operative in this system and controls product formation. Spectroscopic …