Preparation of o,s-dialkyl phosphoroamidothioates

Details Preparation of o,s-dialkyl phosphoroamidothioates Preparation of o,s-dialkyl phosphoroamidothioates

C - Chemistry, Metallurgy

07

F

260/459.2

C07F 9/24 (2006.01)

Patent

CA 1183146

ABSTRACT In the isomerization of an O,O-dialkyl phosphoroamidothioate to an O,S-dialkylphosphoroamidothioate by heating the O,O-dialkyl starting material in the presence of a catalyst, followed by recovery of the desired O,S-dialkyl end product, the improvement which comprises arresting the heating when about 40 to 70% of the O,O-dialkyl starting material has isomerized to O,S-dialkyl product, separating unreacted O,O-dialkyl starting material from the O,S-dialkyl isomeriza- tion product, and further treating the O,O-dialkyl starting material to effect further isomerization. The separation is effected either by cooling to crystal- lize out O,S-dialkyl isomer or by evaporating off the O,O-dialkyl starting mate- rial.

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