Isolation of a bicyclo[3,1,0]hexan-3-one on photolysis of a cyclohexa-2,5-dienone: direct evidence for a zwitterion intermediate
Abstract
A bicyclo[3,1,0]hexan-3-one derivative, formed on photolysis of 4-methyl-4-trichloromethyl cyclohexa-2,5-dienone, is the first dienone photo-product in which the carbon skeleton of the previously postulated zwitterion intermediate has been trapped intact.