Abstract
Two novel syntheses of dibenzo[d,f][1,3]dioxepines starting with biphenol are described. Treatment of biphenol 11a with 2-chloroacrylonitrile gave a 47% yield of dibenzo[d,f][1,3]dioxepin-6-acetonitrile 4, and treatment of 11a with two equivalents of diethyl bromomalonate gave a 95% yield of diethyl dibenzo[d,f][1,3]dioxepin-6,6-dicarboxylate 5a.
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