Dithiophosphoric acid diesters

Phosphorus containing additives include esters of phosphoric acids, derivatives of thiophosphoric acids, phosphites (Davey, 1950 Sakuri and Sato, 1970), and the metal salts of dithiophosphoric acid diesters, the best known of these compounds being the ZDDPs. The structure of ZDDP films, the composition of the film formed, and the mechanism of action on the molecular level are summarized in Chapter 4. 

The preparation methods of dithiophosphoric acid diesters, (RO)2P(S)SH, which are the proligands for dithiophosphato complexes, use almost exclusively the reaction of alcohols with tetra-phosphorus decasulfide ... 

The water soluble sodium and ammonium salts of dithiophosphoric acid-0,0-diesters are used as flotation aids for sulfidic ores. 

Addition of an acid dithiophosphoric acid-0,0-diester to a -C=C- or C=0 double bond results in a neutral 0,0,S-triester as, for example in the synthesis of the insecticide Malathion ... 

Dithiophosphinic acids Dithiophosphoric acid 0,0-diesters Dithiophosphonic acid O-esters... 

In this section we discuss compounds with key elements other than oxygen linked directly to phosphorus. Of these elements, the most important is sulfur, and of the phosphorus/sulfur compounds the most important are the metal salts of diesters of dithiophosphoric acid (phos-phorodithioates), which are used extensively in commercial practice. These have the general formula... 

The 0,0-diesters of dithiophosphoric acids, (RO)2P(S)SH, were first reported in 1908. Chemical interest in these compounds is threefold (a) their coordination with transition metal ions (b) their use as analytical reagents (c) the biological activity of both the ligands and their metal complexes. They have been used for the vulcanization of rubber and as insecticides the latter activity is related to their enzyme-inhibition ability. ... 

Dithiophosphonic acids and esters Dithiophosphorous acid esters Thiolthionophosphonic acid 0-diesters... 

Without additional reagents w.ax. Boronic and halogenohoronic acid esters B,0-Heterocyclics s. 16, 156 Bisboric acid esters s. 16, 157 Diacoxystannanes from stannanes > SnHg > Sn(OAc)2 s. 17,689 Phosphorylation of hydroxy compounds OH OPO3H2 Simplified procedure—Labeled compounds s. 17, 164 Dithiophosphoric acid esters -e- via dithiophosphoric acid 0,0-diesters—P-Lebeled compounds s. 17, 165 ... 

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