1. H. C. Brown and M.-H. Rei, J. Amer. Chem. Soc., 86, 5008 (1964).
2. P. v. R. Schleyer and D. C. Kleinfelter, 138th Meeting of the American Chemical Society, New York, 1960, Abstracts, p. 43P.
3. J. A. Berson, Molecular Rearrangements, P. de Mayo, Ed., Interscience, New York, 1963, p. 182.
4. P. v. R. Schleyer, M. M. Donaldson, and W. E. Watts, J. Amer. Chem. Soc., 87, 375 (1965).
5. P. v. R. Schleyer, P. J. Stang, and D. J. Raber, J. Amer. Chem. Soc., 92, 4725 (1970).