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

  • Kamboj R
  • Berar S
  • Berar U
 et al. 
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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.

Author-supplied keywords

  • 1,4-Biradical
  • 12H-Benzo(a)xanthen-12-one
  • Photocyclisation
  • Pyranopyrone

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