Azulenophenanthrenes from 2,2′-Di(arylethynyl)biphenyls through C[BOND]C Bond Cleavage of a Benzene Ring


  • We thank Prof. S. Kitagawa and Dr. S. Horike (both Kyoto University) for their generosity and assistance in the X-ray crystal structural analysis.


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From six to seven: 2,2′-Di(arylethynyl)biphenyls undergo a skeletal rearrangement in the presence of a platinum(II) catalyst to afford polycyclic aromatic compounds containing an azulene unit. The reaction involves C[BOND]C bond cleavage of a benzene ring, which expands into a seven-membered ring.