Abstract
Zinc enolates obtained from substituted 1-aryl-2,2-dibromoalkanones and zinc react with alkyl 3-oxo-1,3-dihydrobenzo[c]oxepine-4-carboxylate to give the alkyl 1-alkyl-1-aroyl-2-oxo-4,8b-dihydro-1H-3-oxabenzo[a]cyclopropa[c]cycloheptene-1a-carboxylate.
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