Organophosphorus sulfides

Azinphos-methyl is unstable in basic conditions and can degrade to benzazimide, hydroxymethyl-benzazimide, mercaptomethylbenzazimide or bis(benzazimide-A/-methyl) sulfide Azinphos-methyl is an organophosphorus insecticide used to control chewing and sucking mites and insects such as aphids and scale. Azinphos-methyl has both contact and stomach action. Azinphos-methyl is a cholinesterase inhibitor and interferes with the nervous system... 

The nature of the aryl substituent attached to phosphorus has a subtle influence on the ring size of the organophosphorus-sulfur heterocycle obtained from the reactions of ArPCl2 (Ar = aryl) and a source of sulfide. The six-membered ring cyclo-(Mes PS)3 is formed from treatment of Mes PCl2 with lithium sulfide the P3S3 ring adopts a chair conformation with the sulfur atoms... 

In the Nippon Mining Company process,163 the aqueous feed consists of a solution of cobalt, nickel and other metal sulfates obtained by the high-pressure oxidative leaching of a mixed metal sulfide ore. Following the removal of iron and copper by chemical precipitation methods, and the successive extraction of zinc and cobalt by organophosphorus acid reagents (Section 63.3.2.2) under weakly acidic conditions, the pH value of the solution is adjusted to between 9 and 9.5 with ammonia, and nickel is extracted into a 25% solution of LIX 64N in an alkane solvent. 

The reaction of H—SR compounds with vinylic ethers and vinylic sulfides occurs more readily than with unactivated alkenes (equations 300 and 301 ).544-547 An application of this reaction is found in the synthesis of organophosphorus insecticides.548... 

A characteristic property of organophosphorus compounds with P=0 or P=S bonds is their ability to form complexes. This was the basis for the industrial use of these substances as flotation agents in nonferrous metallurgy. Dibutyl- and dicresyldithiophosphates proved efficient collectors of sulfide or sulfidised nonferrous metals during the flotation of oxide ores. 

F. R. Hartley (Ed.), The Chemistry of Organophosphorus Compounds Phosphine Oxides, Sulfides, Selenides, and Tellurides The Chemistry of Functional Groups, Wiley, Chichester, U.K., 1992. 

The sulfones, sulfolane and 3-methylsulfolane, are shown to function quite well, as cosurfactants with CTAB, in the solubilization of both organophosphorus esters and betahalosulfides. For the organophosphate used, tributylphosphate, it is shown through pseudo-three-component phase diagrams that the sulfone functions as effectively as the alcohol in its role of cosurfactant. Solubilization of chloroethyl ethyl sulfide is less effective when the sulfone cosurfactant is used, but is still a dramatic enhancement over its solubility in water alone. The effect of added salt on the solubilization is reported, as well as the effect of changes in the surfactant-cosurfactant ratio. Preliminary quasielastic lightscattering measurements are also reported for these unconventional systems. 

---