Process for the preparation of n-(phosphonomethyl)glycine by...

Details Process for the preparation of n-(phosphonomethyl)glycine by... Process for the preparation of n-(phosphonomethyl)glycine by...

C - Chemistry, Metallurgy

07

F

C07F 9/40 (2006.01) B01J 23/38 (2006.01)

Patent

CA 2339747

This invention is directed to an improved process for the preparation of N- (phosphonomethyl)glycine (i.e., "glyphosate"), a salt of N-(phosphonomethyl)glycine, or an ester of N-(phosphonomethyl)glycine. The process comprises combining an N-substituted N-(phosphonomethyl)glycine reactant with oxygen in the presence of a noble metal catalyst. The N-substituted N-(phosphonomethyl)glycine reactant has formula (V) wherein R1 and R2 are independently selected from the group consisting of hydrogen, halogen, -PO3R12R13, -SO3R14, -NO2, hydrocarbyl, and substituted hydrocarbyl other than -CO215; and R7, R8, R9, R12, R13, R14, and R15 are independently selected from the group consisting of hydrogen, hydrocarbyl, substituted hydrocarbyl, and an agronomically acceptable cation.

Cette invention porte sur un procédé amélioré de préparation de N-(phosphonométhyl)glycine (à savoir </= glyphosate >/= ), d'un sel de -N-(phosphonométhyl)glycine ou d'un ester de N-(phosphonométhyl)glycine. Ce procédé consiste à combiner un réactif de N-substitué N-(phosphonométhyl)glycine avec l'oxygène en présence d'un catalyseur de métal noble. Le réactif de N-substitué N-(phosphonométhyl)glycine a la formule (V) dans laquelle R<1> et R<2> sont sélectionnés indépendamment dans le groupe comprenant hydrogène, halogène, -PO3R<12>R<13>, -SO3R<14>, -NO2, hydrocarbyle, hydrocarbyle substitué autre que -CO2R<15>; et R<7>, R<8>, R<9>, R<12>, R<13>, R<14> et R<15> sont indépendamment sélectionnés dans le groupe comprenant hydrogène, hydrocarbyl, hydrocarbyl substitué et un cation agronomiquement acceptable.

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