Chemistry Letters, Vol.33, No.4, 462-463, 2004
Synthesis of 3,3,6,6-tetraaryl-1,2-dioxanes via TiO2-catalyzed photooxygenation of 1,1-diarylethenes in the presence of Mg(ClO4)(2)
Photooxygenation of methoxy-substituted 1,1-diarylethenes and 1,1,8,8-tetraaryl-1,7-octadienes catalyzed by titanium dioxide proceeded via photoinduced electron transfer to give 3,3,6,6-tetraaryl-1,2-dioxanes in high yields. The photooxygenation was remarkably accelerated by the addition of Mg(ClO4)(2).