1. Cope, A. C.; Hardy, E. M. J. Am. Chem. Soc. 1940, 62, 441444.
2. Frey, H. M.; Walsh, R. Chem. Rev. 1969, 69, 103124. (Review).
3. Rhoads, S. J.; Raulins, N. R. Org. React. 1975, 22, 1252. (Review).
4. Wender, P. A.; Schaus, J. M. White, A. W. J. Am. Chem. Soc. 1980, 102, 6159–6161.
5. Hill, R. K. In Comprehensive Organic Synthesis Trost, B. M.; Fleming, I., Eds.; Pergamon, 1991, Vol. 5, 785826. (Review).