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■ Reaction of N-Benzoyl-4,7-phenanthrolinium Salt with Trimethyl Phosphite and Crystal Structure of Dimethyl N,N’-Dibenzoyl-3,4,7,8-tetrahydro-4,7-phenanthroline-3,8-diphosphonate

Isao Takeuchi, Yoshiki Hamada,* and Zenei Taira

*Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tenpaku, Nagoya 468-8503, Japan

Abstract

The reaction of 4,7-phenanthroline (1) with some substituted benzoyl chlorides and trimethyl phosphite in the presence of sodium iodide gave the corresponding α,α’-diphosphonates, α,γ’-diphosphonates, α-phosphonates, and γ-phosphonates respectively. 3,8-Diphosphonates (2a₁, 2a₂) were separated by thin layer chromatography and the crystal structure of 2a₂ was determined by X-ray analysis.