1. 1) The authors wish to take this opportunity to express their gratitude for the donation of the Grant in Aid for Scientific Research from the Ministry of Education (for 1953).
2. 2) a) A. G. Anderson and J. Tazuma: J. Am. Chem. Soc., 74, 3455 (1952). b) W. Treibs et al.: Ann., 576, 110 (1952); 581, 54 (1953); Angew. Chem., 65, 542 (1953). c) D. Lloyd: Chem. & Ind., 921 (1953).
3. 3) T. Nozoe, S. Seto, S. Matsumura, and T. Terasawa: To be published.
4. 4) T. Nozoe, S. Seto, H. Takeda, S. Morosawa, and K. Matsumoto: Proc. Japan Acad., 28, 192 (1952). T. Nozoe, Y. Kitahara, T. Andô, S. Masamune, and H. Abe: Sci. Rep. Tohoku Univ., First Ser., I, 36, 166 (1952).
5. 5) Microanalyses were carried out by Mr. Onoe of the Sankyô Co., Ltd. (Tokyo) and by Miss K. Katô of this laboratory, to whom the authors express their gratitude.