The pulse Fourier transform 13C n.m.r. spectra at –135·5 and –150 °C of the 13C-labelled barbaralyl cation in superacid show that it has a rapidly rearranging 9-barbaralyl cation structure and/or one with D3h symmetry.
C. Engdahl, G. Jonsäll and P. Ahlberg, J. Chem. Soc., Chem. Commun., 1979, 626 DOI: 10.1039/C39790000626
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