Photochemistry of 4H,7H-Benzo
The title compound 1 was synthesized starting from 1, 2-bis(2-hydroxyethyl)benzene (2). Irradiation (350 nm) of 1 in CH(3)CN affords the all-cis-dimer 6 in >90% yield. Irradiation (>390 nm) of 1 in the presence of tetrachloroethene leads selectively to the monocyclobuta adduct 8, which on subsequent irradiation is converted to a 4:1 mixture of biscyclobuta derivatives 9 and 10.
Kinder
MA
Institute of Organic Chemistry, University of Hamburg, D-20146 Hamburg, Germany.
Margaretha
P