Irradiation of bromonaphthoquinone-fused diphenylcyclopropane in the presences of naphthalene, dimethoxybenzene or triphenylamine gave xanthylium salt via an intramolecular cyclization ofintermediary 2-bromo-ediphenylmethylene-2,3-dihydronaphthoquinone.
H. Moriwaki, T. Oshima and T. Nagai, J. Chem. Soc., Chem. Commun., 1994, 1681 DOI: 10.1039/C39940001681
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