Gabbutt, Christopher D., Heron, B. Mark, Hepworth, John D and Rahman, M.Moshfiqur (1996) The generation and reactions of 3,4-didehydro-2H-[1]benzopyran, a highly strained heterocycle. Tetrahedron Letters, 37 (8). pp. 1313-1316. ISSN 0040-4039
Abstract

Reaction of 3,4-dibromo-2,2,6,8-tetramethyl-2H-[1]benzopyran with either organolithium reagents or magnesium generates the novel aryne, 3,4-didehydro-2H-[1]benzopyran. Cycloaddition with dienes gives access to the dibenzo[b,d]pyran system.

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