1. Department of Chemistry, Faculty of Science, Toho University, Miyama 2-2-1, Funabashi, Chiba 274, Japan, Department of Chemistry, Faculty of Science, Nara Women's University, Nara-shi, Nara 630, Japan, Department of Synthetic Chemistry, Faculty of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan, and The Institute of Physical and Chemical Research, Wako-shi, Saitama 351, Japan