Process for producing dialkyl dithiophosphoric acid esters
AssigneeBoots Hercules Agrochemicals Co.
InventorJames Minn
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Abstract
Disclosed is a method for improving the yield of dialkyl dithiophosphoric acid esters produced by the Lewis acid catalyzed reaction of an O,O-dialkyl dithiophosphoric acid and an organic chloride. More specifically, the method concerns the improvement wherein the reaction is carried out in the presence of from 0.1 to 1.5 moles, per mole of organic chloride, of an anhydride of a fatty acid containing 2 to 5 carbon atoms.
Claims7
In the process of producing O,O-dialkyl dithiophosphoric acid esters by the reaction of an O,O-dialkyl dithiphosphoric acid with an organic chloride which contains at least one acid-replaceable chlorine atom on a carbon atom attached to oxygen, sulfur or nitrogen by a single bond in the presence of a catalytic amount of zinc chloride, ferrous chloride or stannous chloride, the improvement which comprises effecting said reaction in the presence of from 0.1 to 1.5 moles per mole of the organic chloride of an anhydride of a fatty acid containing 2 to 5 carbon atoms.
Dependencies are inferred from the claim text.