A strikingly high (ca. 16 kcal/mol) barrier to rotation around the C(9)–CH2Cl bond in chloromethyl-triptycenes has been detected by temperature-dependent n.m.r. spectroscopy.
N. M. Sergeyev, K. F. Abdulla and V. R. Skvarchenko, J. Chem. Soc., Chem. Commun., 1972, 368 DOI: 10.1039/C39720000368
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