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GRAPHICAL ABSTRACTS S 0.25 (RO) 2 PSH + 0.5 P red + S ROH + 0.25 (RO) 2 POH + 0.25 H 2 S 3a-c 4a-c R = Bu-i (3a, 4a), Oct-i (3b, 4b), Pr-i (3c, 4c) Abstract Mixtures of long chain S-alkyl O,O-dialkyl dithiophosphates, and O-alkyl O,Odialkyl thionophosphates were obtained by the reaction of red phosphorus with elemental sulfur, alcohols, and industrial fractions of С 16 -С 18 and С 20 -С 26 of higher olefins in the presence of Lewis acid catalysts. The products obtained possess high anticorrosion activities toward mild steel.