Phosphoric dithiophosphoric ester acids

The neutral thio- and dithiophosphoric ester acids with a reactive easily hydrolytically cleavable group, are utilized as insecticides. Their effect is based on in vivo oxidation to the corresponding phosphoric acid ester, which... 

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. 

Acyclic and six-membered cyclic phosphorous acids, except salicylic derivatives, exist in a form containing the P(0)H fragment and have AHn values in the gaseous phase of —70 kJ mol", and values for 1,3,2-dioxophospholanic analogues are —40 kJ mol". Calorimetric studies, in a heat-flow reaction calorimeter on the reaction of dithiophosphoric acid 0,0 -dialkyl esters, (R0)2P(S)SH, with zinc oxide, have been used to determine the reaction kinetics, "... 

Phosphoric acid monoesters from dithiophosphorous acid esters... 

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See also in sourсe #XX -- [ ]

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