Intramolecular Photoreactions of 9-Cyanophenanthrene-Linked Arylcyclopropanes.

With the aim of developing efficient and useful processes for the preparation of polycyclic organic compounds, intramolecular [3 + 2] photoreactions of 9-cyanophenanthrene-linked arylcyclopropanes were investigated. Photoreactions of , which contain respective -methoxyphenylcyclopropane and phenylcyclopropane moieties, form the intramolecular [3 + 2] photocycloadducts, endo- and exo-, along with the dihydroisochroman derivatives, cis- and trans-. The efficiency of the photoreaction of is higher when benzene rather than acetonitrile is used as a solvent.