A METHOD OF PREPARING MONOTHIOPHOSPHORIC ACID BY SULFURIZING A PHOSPHITE IN THE PRESENCE OF AN AMIDE

摘要

A method of preparing an oil-soluble composition is disclosed. The method comprises preparing a dihydrocarbyl monothiophosphoric acid characterized by the formula (I) wherein R1 and R2 are each independently hydrocarbyl groups of from 1 to about 30 carbon atoms and X is oxygen or sulfur, with the proviso that one X is sulfur comprising reacting (A) a phosphite ester of the structure with (B) a sulfur source, in the presence of (C) a catalytic amount of an amide of the structure R3CONR4R5 wherein R3, R4 and R5 are each independently hydrogen or a hydrocarbyl group containing from 1 to about 30 carbon atoms or an ethoxylated amide of the structure wherein the sum of x and y is from 1 to about 50; and isolating the reaction product obtained.