title: [4 + 4] photodimerization of azaanthracenes in both solution and solid phase controlled by cation-π interactions.
abstract: Regio- and stereoselective [4 + 4] photodimerization reactions of 1- and 2-azaanthracenes were performed in both methanol solution and solid phases to give anti-HT dimers in high yields. In these reactions, intermolecular cation-π interactions between the pyridinium cation and the benzene ring play a key role in preorientation prior to the photodimerization reactions.
authors.affiliation: Department of Chemistry, Ochanomizu University, Bunkyo-ku, Tokyo, Japan. yamada.shinji@ocha.ac.jp
authors.forename: Shinji
authors.initials: S
authors.lastname: Yamada
authors.forename: Chiaki
authors.initials: C
authors.lastname: Kawamura