Conclusion This study fails to support bicycloaromaticity as a significant factor in determining radical cation structures. In contrast, homoaromaticity is Seen to provide stabilization to the extent that the intramolecular [3+ 21 cycloaddition of y+ to homoaromatic a homoaromatic radical cation structure type. As with several Other recent examples from Our laboratory, we note that the potential energy surfaces of radical cation and the corresponding neutral ...
[Turro, Nicholas J.; Cha, Yuan; Gould, Ian R.; Padwa, Albert; Gasdaska, John R.; Tomas, Miguel Journal of Organic Chemistry, 1985 , vol. 50, # 22 p. 4415 - 4417]