Quadricyclane (1a) as well as its 3-substituted derivatives were rapidly isomerized to norbornadiene (2a) and the corresponding derivatives by the action of catalytic amounts of tris-(p-bromophenyl)ammoniumyl salts (5).
R. W. Hoffmann and W. Barth, J. Chem. Soc., Chem. Commun., 1983, 345 DOI: 10.1039/C39830000345
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