Phosphonothioic dichlorides, general

Phosphonothioic dichlorides, general preparation from phosphonic di-... 

Preparative methods have been devised for two new phosphonothioic dichlorides RP(S)C12, where R = 2-chlorocyclohexyl and 1-cyclohexen-l-yl,594 and for the pentafluorophenyl derivatives C6F5P(S)X2, R(C6F5)P(S)X, and (C6Fs)2P(S)X.595 Compounds with the general formula [R2P(X)]2Y, where X and Y = O or S, have been prepared for detailed n.m.r. 

In 1952, Kinnear and Perren recorded that the complex from EtCl, AICI3 and PCI3 was reactive to H2S at 130 °C and afforded a substance with the composition EtPS2- This reaction received further attention from Newallis et and was developed as a general method of synthesis in its essentials, the synthesis involves the formation of the dichlorides, RP(S)Cl2, which, in the absence of an acid acceptor, react slowly with H2S even at 160 °C in the presence of Et3N, the reactions are much faster (Scheme 56). Indeed, Grishina and coworkers and also Fukuto s group prepared the same products directly from phosphonothioic dichlorides and H2S. 

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