Photospecific cleavage of one of the cyclopropyl ς-bonds of vinylnorcaradienes
Abstract
The benzophenone sensitised photochemical reaction of vinylnorcaradiene derivatives 1, 5-(2-methylprop-1-enyl)-3-oxatricyclo[4.4.0.01,5]deca-7,9-dien-4-ones, resulted in the regioselective cleavage of one of the cyclopropyl ς-bonds to afford the isochroman-3-one derivatives 7.