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Supramolecular photochemical synthesis of an unsymmetrical cyclobutane

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Abstract

2-Styrylbenzothiazole (1) and cinnamic acid (2) derivatives containing 15-crown-5 ether moieties form a supramolecular assembly in the presence of Ba2+ 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 Ba2+ complex formation between the crown ether moieties of 1 and 2, and by p–p 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.

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Fedorova, O., Fedorov, Y.V., Gulakova, E. et al. Supramolecular photochemical synthesis of an unsymmetrical cyclobutane. Photochem Photobiol Sci 6, 1097–1105 (2007). https://doi.org/10.1039/b707093d

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  • DOI: https://doi.org/10.1039/b707093d

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