1. J. Chem. Soc., Chem. Commun. 1993, 1305.
2. J. Chem. Soc., Chem. Commun. 1971, 1129;
3. J. Chem. Soc., Chem. Commun. 1973, 78.
4. ?Circular Dichroic Spectroscopy,? Oxford University Press, Oxford, 1983.
5. (a) in ?Comprehensive Organic Synthesis,? Eds. and Pergamon Press, Oxford, 1991, Vol. 2, p. 1050;