1. 1) T. Nozoe and Y. Kitahara: Paper read before the “Discussions on Tropolone Chemistry”. Chemical Society of Japan, Tokyô, July 5, 1952.
2. 2) A part of this experiment was summarized in J. Chem. Soc. Japan, 73, 781 (1952).
3. 3) B. D. Abadir, J. W. Cook, J. D. Loudon, and D. K. V. Steel: J. Chem. Soc., 1952, 2350.
4. 4) T. Nozoc, S. Seto, H. Takeda, S. Morosawa, and K. Matsumoto: Sci. Rep. Tôhoku Univ. [I] 36, 54 (1952).
5. 5) Cook, et al.3) gave m.p. 117-119° for 2-bromotropone obtained by the action of phosphorus tribromide on tropolone.