The radical cation generated from bicyclobutylidene in the CFCl3 solution γ-irradiated at 77 K exhibits a 26.2 G nonet (1 G = 10–4 T) of 2.7 G quintets in its e.s.r. spectrum; this experimental result and INDO and MINDO/3-UHF calculations predict a planar structure for the bicyclobutylidene radical cation.
K. Morihashi, H. Kometani, O. Takahashi, H. Togo and O. Kikuchi, J. Chem. Soc., Chem. Commun., 1989, 1473 DOI: 10.1039/C39890001473
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