321906-45-0Relevant articles and documents
Photochemistry of 4H,7H-benzo[1,2-c:4,3-c′]dipyran-4,7-dione, a twofold isocoumarin
Kinder, Michael A.,Margaretha, Paul
, p. 4253 - 4255 (2007/10/03)
(equation presented) 1 6 92% The title compound 1 was synthesized starting from 1,2-bis(2-hydroxyethyl)benzene (2). Irradiation (350 nm) of 1 in CH3CN 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.