1. 1) The authors are indebted to Grant in Aid for Fundamental Scientific Research of the Ministry of Education and to Takasago Perfumery Co., Ltd. and Sankyô Co., Ltd. for financial support.
2. 2) This work was presented at Symposium on Tropolone and Allied Compounds held by the Chemical Society of Japan in Tokyo, February 6, 1954.
3. 3) T. Nozoe, Y. Kitahara, and S. Masamune: Proc. Japan Acad., 27, 649 (1951).
4. 4) B. J. Abadir, J. W. Cook, J. D. Loudon, and D. K. V. Steel: J. Chem. Soc., 2350 (1952).
5. 5) T. Nozoe, Y. Kitahara, and S. Masamune: Proc. Japan Acad., 29, 17 (1953).