1. 1) Paper read before the 9th Annual Meeting of the Chemical Society of Japan at Kyoto, April 5, 1956.
2. 2) P. Akroyd, R. D. Haworth, and P. R. Jefferies: J. Chem. Soc., 1954, 286.
3. 3) Cf. P. L. Pauson: Chem. Rev., 55, 9 (1955).
4. 4) T. Nozoe, T. Ikemi, N. Miyai, and Y. Kikuchi: Proc. Japan Acad., 32, 476 (1956).
5. 5) T. Nozoe, E. Sebe, L. S. Chien, Y. Mayama, and T. J. Hsü: Science Repts. Tohoku Univ., First Ser., 36, 299 (1952).