Synthetic Photochemistry. Elaboration of the Tricyclo2,6>undecane ('Hirsutane') Carbon Skeleton by Intramolecular Photocyclisations of Dicyclopent-1-enylmethanes

Article abstract of DOI:10.1039/P19810001052

Irradiation of the dicyclopent-1-enylmethane (5) in methanol is shown to lead to intramolecular <2+2> cycloaddition, followed by in situ addition of methanol to the presumed intermediate bicyclo<2.1.0>pentane (11), producing the cis,syn,cis-tricyclo<6.3.0