title: Novel intramolecular photocyclization of α-arylthiophene derivatives.
abstract: Photoirradiation of α-arylthiophene derivatives linked with an alkene moiety through a three-atom spacer gave unprecedented cyclobutene-fused perhydrothiapentalene-type compounds in high yields, but neither [2 + 2] nor [4 + 2] cycloaddition products. The reaction afforded a single diastereomer in many cases. The chemical structure and relative configuration of a typical product were unambiguously determined by X-ray crystallographic analysis.
authors.affiliation: Division of Chemical Process Engineering, Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan. n-arai@eng.hokudai.ac.jp
authors.forename: Noriyoshi
authors.initials: N
authors.lastname: Arai
authors.forename: Koichiro
authors.initials: K
authors.lastname: Tanaka
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ohkuma