title: Photochemistry of benzotriazole: an unprecedented tautomer-selective intermolecular [2+2] photocycloaddition.
abstract: [reaction: see text]. Irradiation of benzotriazole with a variety of maleimide derivatives leads to the stereo- and regioselective formation of aryl [2 + 2] photocycloaddition products. Further studies with 2-alkyl benzotriazole derivatives indicates that in the case of the parent benzotriazole this cycloaddition proceeds selectively via the 2H-tautomer.
authors.affiliation: School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK. k.booker-milburn@bristol.ac.uk
authors.forename: Kevin I
authors.initials: KI
authors.lastname: Booker-Milburn
authors.forename: Paul M
authors.initials: PM
authors.lastname: Wood
authors.forename: Richard F
authors.initials: RF
authors.lastname: Dainty
authors.forename: Michael W
authors.initials: MW
authors.lastname: Urquhart
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: White
authors.forename: Helen J
authors.initials: HJ
authors.lastname: Lyon
authors.forename: Jonathan P H
authors.initials: JP
authors.lastname: Charmant