Intramolecular Photochemical Cycloaddition Reactions of 3-(1,5-Dimethylhex-4-enyl)cyclohex-2-enone: Regio- and Stereochemical Aspects

Article abstract of DOI:10.1021/jo00341a030

The intramolecular photocycloaddition reaction of the title enone (1) and its 1-demethyl analogue (2) gives head-to-head , <2+2> adducts containing cyclopenta<1,4>cyclobuta<1,2>benzen-5(6H)-one skeletons and none of the head-to-tail isomers of the tricycl