Section 7
Chapter 6,111

Photochemistry of flavonoids 5. photo cyclization of 2 styryl 4h chromen 4 ones

Yokoe, I.; Higuchi, K.; Shirataki, Y.; Komatsu, M.

Chemical and Pharmaceutical Bulletin 29(9): 2670-2674


ISSN/ISBN: 0009-2363
Accession: 006110332

Irradiation of 2-styryl-4H-chromen-4-ones with a high pressure Hg lamp at room temperature under air gave benzo[a]xanthones. The cyclization of methoxy-substituted styrylchromones occurred at the para position relative to the OMe [methoxy] group on the styryl ring, whereas 2-[.beta.-(2-naphthyl)vinyl]chromone cyclized at the .alpha.-position of the naphthalene ring.

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