The dehydrobromination of 5,7-dibromodibenzo[a,c]cycloheptadien-6-one (II) has been investigated as a possible route to phenanthrocyclopropenone (I). The products of the reactions are derivatives of 9-phenanthroic acid, but the cyclopropenone is probably not an intermediate in their formation.
T. L. Gilchrist and C. W. Rees, J. Chem. Soc. C, 1969, 1763 DOI: 10.1039/J39690001763
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