✦ LIBER ✦

Synthesis and reactivity of some 3,4-dibromo-2H-[1]benzopyrans: The generation and reactions of 3,4-didehydro-2H-[1]benzopyran

✍ Scribed by Christopher D. Gabbutt; John D. Hepworth; B.Mark Heron; Md.Moshfiqur Rahman; Simon J. Coles; Michael B. Hursthouse

Publisher: Elsevier Science
Year: 1999
Tongue: French
Weight: 785 KB
Volume: 55
Category: Article
ISSN: 0040-4020
DOI: 10.1016/s0040-4020(99)00571-2

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✦ Synopsis

Reaction of 3,2,

benzopyran with either organolithium reagents or magnesium generates the novel strained alkyne, 3,4-didehydro-2H-[1]benzopyran. Cycloaddition with furans gives access to the dibenzo[b,d]pyran system.

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