Process for the preparation of methylenebisphosphonic acids

Details Process for the preparation of methylenebisphosphonic acids Process for the preparation of methylenebisphosphonic acids

C - Chemistry, Metallurgy

07

F

C07F 9/38 (2006.01)

Patent

CA 2066430

The object of the invention is a process for the preparation of optionally mono- or dihalogen substituted methylenebisphosphonic acids, whereby the corresponding lower alkyl tetraester is hydrolyzed in an aqueous solution of the tetraester and hydrochloric acid, which solution contains 1 to 5 % by weight of HCl, calculated on the mixture.

Procédé de préparation des acides méthylènebisphosphoniques substitués par mono- ou par dihalogène. Le tétraester d'alkyle inférieur correspondant est hydrolysé dans une solution aqueuse du tétraester et d'acide chlorhydrique, laquelle solution contient de 1 à 5 % en poids d'acide chlorhydrique, calculé à partir du mélange.

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