The e.s.r. spectrum of the norbornadien-7-yl radical shows that its trigonal carbon atom (Cα) is more pyramidal than that of the cyclopropyl radical; it is suggested that the pyramidal deformation of the former is due to electron transfer interaction from the etheno bridges to Cα as well as to the small bond angle around Cα.
Y. Sugiyama, T. Kawamura and T. Yonezawa, J. Chem. Soc., Chem. Commun., 1978, 804 DOI: 10.1039/C39780000804
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