Production of dialkylthiophosphates
AssigneeHoechst Aktiengesellschaft
InventorBernhard Lippsmeier
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Abstract
Production of dialkylthiophosphates of the general formula: ##EQU1## IN WHICH R.sub.1 and R.sub.2 stand for identical or different linear and/or branched alkyl radicals having from 1 to 6 carbon atoms, M stands for a metal cation and n stands for the valence of the metal cation concerned, wherein O,O-dialkylphosphites of the general formula: ##EQU2## in which R.sub.1 and R.sub.2 have the meanings given above, are reacted with a compound yielding the metal cation M, in the presence of pulverulent sulfur and organic solvents at elevated temperature, More particularly, high-grade and very pure dialkylthiophosphates are produced by using, as the compound yielding the metal cation M, the oxide of the corresponding mono- to tetravalent metal.
Claims7
In the process for making dialkylthiophosphates of the general formula:
- ##EQU3## in which R.sub.1 and R.sub.2 stand for identical or different linear and/or branched alkyl radicals having from 1 to 6 carbon atoms, M stands for a metal cation and n stands for the valence of the metal cation concerned, wherein O,O-dialkylphosphites of the general formula:
- ##EQU4## in which R.sub.1 and R.sub.2 have the meanings given above, are reacted with a compound yielding the metal cation M, in the presence of pulverulent sulfur and organic solvents at elevated temperature, the improvement which comprises reacting an oxide of zinc, cadmium or lead or either in admixture with at most 50 weight % of the corresponding metal carbonates or basic metal oxides as the compound yielding the metal cation M, with the remaining reaction compounds, whereby high grade and very pure dialkylthiophosphates are obtained.
Dependencies are inferred from the claim text.