Phototransformations of some 3-alkoxy-6-chloro-2-{(E)-1′-methyl-2′-phenylvinyl}chromones: A study of type-II and triene bichromophoric system

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Abstract

Irradiation of a methanolic solution of 3-alkoxy-6-chloro-2-{(E)-1′-methyl-2′-phenylvinyl}-4-oxo-4H-1-benzopyrans yielded 12H-benzo[a]xanthen-12-one, pyranopyrones, oxetanopyrananones and 7-chloro-3-methyl-2-phenyl-1,4-dioxa-cyclopenta-[b]naphthalene-9-one depending upon the structure of 3-alkoxy group (methoxy, benzyloxy, and allyloxy). The methyl group on the styryl moiety has been found to have a profound effect on the product formation due to the variation of energy gap between the π-π* excited state of triene system as compared to the n-π* state of the C{double bond, long}O group. © 2009 Elsevier B.V. All rights reserved.

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Kamboj, R. C., Berar, S., Berar, U., Thakur, M., & Gupta, S. C. (2009). Phototransformations of some 3-alkoxy-6-chloro-2-{(E)-1′-methyl-2′-phenylvinyl}chromones: A study of type-II and triene bichromophoric system. Journal of Photochemistry and Photobiology A: Chemistry, 204(2–3), 122–128. https://doi.org/10.1016/j.jphotochem.2009.03.005

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