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■ Synthesis of Stable 7-Phosphanorbornadiene P-Oxides

Kiyoshi Matsumoto,* Shiro Hashimoto, and Takane Uchida

*Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan

Abstract

Nonbenzo-annelated stable 7-phosphanorbornadiene P-oxides have been prepared for the first time by the high pressure Diels-Alder reaction of 1,2,3,4,5-pentaphenylphosphole oxide with diaroylacetylenes. The P-oxides decompose around 100°C to give the 1,2-diaroyl-3,4,5,6-tetraphenylbenzenes.