Photochemical generation of 1,4-diphenylbutane-1,4-diyl
Abstract
Photochemical deazetation of 3,6-diphenyl-3,4,5,6-tetrahydropyrazine (1) was re-examined; evidence was obtained for trapping of a diradical intermediate (2) by oxygen when (1) was photolysed in the absence of solvent.