Process for preparing n-phosphonomethylamino carboxylic acids

Details Process for preparing n-phosphonomethylamino carboxylic acids Process for preparing n-phosphonomethylamino carboxylic acids

C - Chemistry, Metallurgy

07

F

C07F 9/38 (2006.01)

Patent

CA 2193234

A process for preparing N-hydroxyalkylaminomethylphosphonic acid or salts thereof which comprises contacting an alkanolamine, formaldehyde and a dialkyl phosphite in the presence of an alcohol under suitable reaction conditions to produce a reaction mixture, and hydrolyzing the reaction mixture under acidic or basic conditions. In one embodiment, the N- hydroxyalkylaminomethylphosphonic acid or salts thereof is catalytically oxidized to produce an N-phosphonomethylaminocarboxylic acid or salts thereof.

Procédé de préparation de l'acide N-hydroxyalkylaminométhylphosphonique ou de sels de celui-ci, consistant à mettre en contact une alcanolamine, un aldéhyde formique ainsi qu'un phosphite de dialkyle en présence d'un alcool dans des conditions de réaction appropriées afin d'obtenir un mélange de réaction, puis à hydrolyser ce mélange dans des conditions neutres, acides ou basiques. Dans un mode de réalisation, on oxyde de façon catalytique l'acide N-hydroxyalkylaminométhylphosphonique ou des sels de celui-ci afin d'obtenir un acide N-phosphonométhylaminocarboxylique ou des sels de celui-ci.

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