Phosphines diphosphine disulfide

Other related compounds are the diphosphine disulfides R2P(S)P(S)R2 14, which contain a direct phosphorus-phosphorus bond, and polysulfur fe(dior-ganophosphine sulfides) R2P(S)-S -P(S)R2 in which the two phosphorus centres are connected by a chain of one of more sulfur atoms. R2P(S)P(S)R2 compounds are accessible from heating secondary phosphine sulfides with thiophosphinic chlorides (Equation 10) or by reaction of fephosphines with... 

The metal and ammonium salts of dithiophosphinic acids tend to exhibit far greater stability with respect to this thermal decomposition reaction, and consequently these acids are often prepared directly in their salt form for convenience and ease of handling. Alkali-metal dithiophosphinates are accessible from the reaction of diphosphine disulfides with alkali-metal sulfides (Equation 22) or from the reaction of alkali-metal diorganophosphides with two equivalents of elemental sulfur (Equation 23). Alternatively, they can be prepared directly from the parent dithiophosphinic acid on treatment with an alkali-metal hydroxide or alkali-metal organo reagent. Reaction of secondary phosphines with elemental sulfur in dilute ammonia solution gives the dithiophosphinic acid ammonium salts (Equation 24). 

Cleavage of diphosphines with LiAIH, can be a route to secondary phosphines, e.g., diphosphine disulfides react ... 

Tertiary phosphine sulfides were reported as products from the reaction of thiophosphoryl chloride with Grignard reagents in a ratio greater than 1 3 (183,188). However, Kabachnik and Shepeleva discovered in 1949 that diphosphine disulfides can result from this condensation (101). 

Thionyl chloride Phosphinic acid chlorides from diphosphine disulfides... 

Without additional reagents Thiophosphinic acid bromides from diphosphine disulfides s. 19, 590 Thionyl chloride Phosphinic acid chlorides from diphosphine disulfides s. 19, 591... 

Reactions with diphosphine disulfides Phosphinic acids and sec. phosphines... 

The preparation of ethylenebis(dimethylphosphine) has been described by metallation of phosphine with sodium, followed by methylation of the resulting sodium phosphide with iodomethane. Two further metallation-methylation sequences using sodamide and iodomethane produce sodium dimethylphosphide, which is treated with 1,2-dichloroethane in liquid ammonia, to give the diphosphine.2 Other procedures involve heating tetramethyldiphosphane with ethylene,3 or tetramethyldiphosphane disulfide with ethylene, both... 

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