Key points are not available for this paper at this time.
K. N. Houk, E. J. McAlduff, P. D. Mollére, R. W. Strozier and Y. Chang, J. Chem. Soc., Chem. Commun., 1977, 141 DOI: 10.1039/C39770000141
Houk et al. (Sat,) studied this question.