Process for preparing malathion for pharmaceutical use

Details Process for preparing malathion for pharmaceutical use Process for preparing malathion for pharmaceutical use

A - Human Necessities

61

K

A61K 31/6615 (2006.01) A61P 33/14 (2006.01) C07F 9/02 (2006.01)

Patent

CA 2612578

The present invention provides a process for preparing a highly pure form of malathion having a reduced level of toxic impurities. In addition, the malathion prepared by the process of this invention is storage stable. The level of toxic impurities in the malathion, e.g., isomalathion, O,O,S- trimethyl phosphorodithioate (MeOOSPS), O, O, S-trimethyl phosphorothioate (MeOOSPO), O,S,S-trimethyl phosphorodithioate (MeOSSPO), malaoxon, isomalathion, diethyl fumarate, methyl malathion, dimethyl malathion, O,O- methyl, ethyl-S-(1,2-dicarboethoxy)ethyl-phosphorodithioate arse lower than that of any other commercial preparation of malathion that may be used for pharmaceutical purposes.

L'invention concerne un procédé pour préparer une forme de malathion présentant un degré de pureté extrêmement élevé et un niveau réduit d'impuretés toxiques. De plus, le malathion préparé au moyen du procédé selon l'invention est stable au stockage. Le niveau d'impuretés toxiques contenues dans le malathion, par ex. dans les composés isomalathion, O,O,S-triméthyl phosphorodithioate (MeOOSPS), O,O,S-triméthyl phosphorothioate (MeOOSPO), O,S,S-triméthyl phosphorodithioate (MeOSSPO), malaoxon, isomalathion, fumarate de diéthyle, malathion de méthyle, malathion de diméthyle, O,O-méthyl,éthyl-S-(1,2-dicarboéthoxy)éthyl-phosphorodithioate est inférieur à celui de toute autre préparation commerciale de malathion pouvant être utilisée à des fins pharmaceutiques.

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