The monochloro- and dichloro-derivatives of 5H-dibenzo[a,d]cyclohepten-5-one and 10,11-dihydro-5H-dibenzo-[a,d]cyclohepten-5-one have been synthesised. Dipole moments of the compounds show that their molecules cannot be planar.
H. Weiler-Feilchenfeld and A. Solomonovici, J. Chem. Soc. B, 1971, 869 DOI: 10.1039/J29710000869
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