In 7-(1,2,3,4,5,6,7-heptaphenylcycloheptatrienyl) isothiocyanate and isoselenocyanate, migration of isothiocyanate and isoselenocyanate groups along the perimeter of the seven-membered ring occurs via an intramolecular dissociation–recombination mechanism with high free energy barriers (ΔG≠298) of 24.3 and 22.4 kcal mol–1, respectively.
G. A. Dushenko, I. E. Mikhailov, A. Zschunke, G. Reck, B. Schulz and V. I. Minkin, Mendeleev Commun., 1999, 9, 222 DOI: 10.1070/MC1999v009n06ABEH001166
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