The thermal rearrangement of 1,1,2,2-tetraphenylcyclopropane (1) to 1,1,3-triphenylindan (2) involves formation of an intermediate triene (3) which has been detected by u.v. spectroscopy and trapped by reaction with enophiles.
R. W. R. Humphreys and D. R. Arnold, J. Chem. Soc., Chem. Commun., 1979, 793 DOI: 10.1039/C39790000793
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