Process for the preparation of diphosphonic acids and salts...

Details Process for the preparation of diphosphonic acids and salts... Process for the preparation of diphosphonic acids and salts...

C - Chemistry, Metallurgy

07

F

C07F 9/38 (2006.01)

Patent

CA 2058905

ABSTRACT A process for the preparation of diphosphonic acids of the formula Image and salts thereof, wherein 2 ? n ? 8, obtained by reacting the corresponding aminocarboxilic acid with phosphorous acid and phosphorus trihalide characterized in that the reaction is conducted under relatively large excess of phosphorous acid and phosphorus trihalide.

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