Improved methodology for photocyclization reactions
作者:Longbin Liu、Bingwei Yang、Thomas J. Katz、Michael K. Poindexter
DOI:10.1021/jo00012a005
日期:1991.6
To photocyclize stilbenes, a stoichiometric amount of iodine plus propylene oxide in the absence of air is superior to a catalytic amount of iodine in the air. The propylene oxide prevents HI from photoreducing double bonds. The absence of air prevents photooxidative side reactions, shown in one case to be caused by a photogenerated oxidant, possibly hydrogen peroxide.