Funktionelle Trimethylphosphinderivate, VIII Phosphoniumsalze, Oxide und Sulfide von Tetraorganodiphosphinomethanen, R2PCH2P(CH3)2/ Functional Derivatives of Trimethylphosphine, VIII Phosphonium salts, Oxides and Sulfides of Tetraorganodiphosphinomethanes, R2PCH2P(CH3)2

Abstract

Tetramethyldiphosphinomethane (CH₃)₂PCH₂(CH₃)₂ (1a) reacts with HCl/ether to form the mono-and bisquaternary salts [(CH₃)₂PCH₂P(H)(CH₃)₂]Cl (2) and [(CH₃)₂(H)PCH₂P(H)(CH₃)₂]Cl₂ (3), respectively. The system 1a/HCl, incorporating 1 a/2/3, represents a useful tool for studying the appearance of XnAA′X′n-spin type systems. These compounds are also prototypes for a variety of other mono-or bis-phosphonium salts, which are formed in the reactions of the diphosphines (CH₃)₂PCH₂PR₂ (R = CH₃, t-C₄H₉, C₆H₅) (1a-c) with (CH₃)₂CO + HCl, CH₃I, t-C₄H₉Br, C₆H₅COCl, (CH₃)₂PCl and Br(CH₂)_nBr (n = 1, 2). Heterocycles are not obtained. The dioxide 14 and the disulfide 15 are also described. Some properties and spectroscopic data (IR, ¹H, ³¹P and ¹³C NMR) of 26 new compounds are reported and briefly discussed.