FIELD: organophosphorus chemistry. SUBSTANCE: triphenyl thionphosphate, used in industry as motor and transmission oil additives, plasticizers, antioxidants, cracking catalysts, etc., are prepared via interaction of triphenyl phosphite with sulfur in presence of amines. Reaction is carried out in nonpolar or moderately polar solvent in presence of diamine, in particular ethylenediamine or propylenediamine, taken in amounts 2 to 4 molar % based on initial triphenyl phosphite. EFFECT: reduced reaction temperature and increased purity of products. 5 ex
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