title: A chiral thioxanthone as an organocatalyst for enantioselective [2+2] photocycloaddition reactions induced by visible light.
abstract: Thioxanthone 1, which was synthesized in a concise fashion from methyl thiosalicylate, exhibits a significant absorption in the visible light region. It allows for an efficient enantioselective catalysis of intramolecular [2+2] photocycloaddition reactions presumably by triplet energy transfer.
authors.affiliation: Lehrstuhl für Organische Chemie I and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstr. 4, 85747 Garching (Germany) http://www.oc1.ch.tum.de/home_en/
authors.forename: Rafael
authors.initials: R
authors.lastname: Alonso
authors.forename: Thorsten
authors.initials: T
authors.lastname: Bach
keywords: cycloaddition; enantioselectivity; hydrogen bonds; organocatalysis; photochemistry