Photochemical Generation and Reversible Cycloaromatization of a Nine-Membered Ring Cyclic Enediyne
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Date
2009
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Journal of the American Chemical Society
Abstract
Irradiation of the nine-membered ring enediyne precursor, which has one of its triple bonds masked as cyclopropenone, efficiently (? = 0.34) generates the reactive 4,5-benzocyclonona-2,6-diynol. The latter rapidly equilibrates with the corresponding 1,4-didehydronaphthalene diradical and then undergoes rate-limiting hydrogen abstraction to produce the ultimate product of the Bergman cyclization, benz[f]indanol.