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2004
Benzopyran derivatives
R 0350
Phototransformations of Some 3-Alkoxy-2-styrylchromones: Type II Cyclizations
1,4- and 1,6-Biradicals. — The reactions of chromones bearing methoxy, benzyl51- 106 of
oxy, and allyloxy groups at the 3-position are studied under irradiation with UV-light.
In general, the products are formed by initial H-abstraction by the C=O group, producing mesomeric biradicals which further react. In all cases except for methoxy chromone
(I), tricyclic pyranones are isolated as main products. — (GUPTA*, S. C.; YUSUF,
M.; SHARMA, S.; SAINI, A.; ARORA, S.; KAMBOJ, R. C.; Tetrahedron 60 (2004)
38, 8445-8454; Dep. Chem., Kurukshetra Univ., Kurukshetra 136 119, India; Eng.)
— Klein
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