title: Supramolecular photochemical synthesis of an unsymmetrical cyclobutane.
abstract: 2-styrylbenzothiazole (1) and cinnamic acid (2) derivatives containing 15-crown-5 ether moieties form a supramolecular assembly in the presence of Ba(2+) cations in acetonitrile. The assembly is stabilized by hydrogen bonding between the heterocyclic N atom of 1 and the proton of the carboxylic group of 2, by sandwich Ba(2+) complex formation between the crown ether moieties of 1 and 2, and by pi-pi stacking interactions. Irradiation of solutions containing these supramolecular complexes leads to highly specific formation of an unsymmetrical cycloadduct. This investigation provides an interesting example of supramolecular control of [2 + 2]-photocyclization in solution.
authors.affiliation: Photochemistry Center of Russian Academy of Sciences, Novatorov str., 7a, 119421, Moscow, Russia.
authors.forename: O
authors.initials: O
authors.lastname: Fedorova
authors.forename: Yu V
authors.initials: YV
authors.lastname: Fedorov
authors.forename: E
authors.initials: E
authors.lastname: Gulakova
authors.forename: N
authors.initials: N
authors.lastname: Schepel
authors.forename: M
authors.initials: M
authors.lastname: Alfimov
authors.forename: U
authors.initials: U
authors.lastname: Goli
authors.forename: J
authors.initials: J
authors.lastname: Saltiel