1. 1) The present research was financed by the Grant in Aid of Scientific Research by the Ministry of Education and by the donation from the Takasago Perfumery Co. Ltd.
2. 2) T. Nozoe, T. Mukai, and J. Minegishi: Proc. Japan Acad., 27, 419 (1951).
3. 3) T. Nozoe, Y. Kitahara, and S. Masamune: Proc. Japan Acad., 27, No. 10 (1951).
4. 4) Private communication from Prof. T. Watanabe. X-ray-analysis shows that (I) is 2-methoxy-7-bromotropone.
5. 5) Microanalyses were carried out by Messrs. Hirai and Kawamoto of the Sankyo Co., Ltd.