... Masahiko Yamaguchi,* Akio Hayashi, and Masahiro Hirama Department of Chemistry, Faculty of Science Tohoku University, Aoba, Sendai 980-77, Japan Received May 16, 1994 ... 0 1995 American Chemical Society Page 2. 1152 J. Am. Chem. Soc., Vol. 117, No. 3, 1995 ...