9,10-Dicyanoanthracene-sensitizedphoto-oxygenation of trans-1,2-di(carbazol-9-yl)cyclobutane in acetonitrile efficiently affords 3,6-di(carbazol-9-yl)-1,2-dioxan.
Abstract Photoreaction of 9-vinylcarbazole in acetonitrile in the presence of titanium dioxide and a catalytic amount of magnesium perchlorate gave 3,6-di(9-carbazolyl)-1,2-dioxane as a photooxygenated product via photodimerization of 9-vinylcarbazole. The photoreaction proceeds via an electron transfer mechanism, where magnesium perchlorate accelerated formation of the photooxygenated product.