Preparation of phosphonic acid derivatives

Details Preparation of phosphonic acid derivatives Preparation of phosphonic acid derivatives

C - Chemistry, Metallurgy

07

F

C07F 9/38 (2006.01) C07F 9/6571 (2006.01)

Patent

CA 2317479

The method provides for the preparation of alkene phosphonic acids and salts thereof, such as VDPA (vinylidene diphosphonic acid). The products can be produced in a stable, substantially pure form and in high yield. The method includes the azeotropic removal of water from salts of .alpha.-hydroxy-alkane disphosphonic acid dimer or corresponding acids thereof, and the pyrolysis of the dehydrated reactant at a temperature of from 170 °C to 300 °C. There may be included a step to convert anhydrides which have been formed during the pyrolysis. The method may include the use of heat transfer agents and/or bases, and may be carried out at elevated or reduced pressure.

L'invention concerne un procédé qui permet de préparer des acides alcène-phosphoniques et leurs sels, tels que le VDPA (acide vinylidène-phosphonique). Ces acides peuvent être produits sous une forme stable sensiblement pure et avec un rendement élevé. Le procédé comprend l'élimination azéotropique de l'eau des sels d'un dimère d'acide alpha -hydroxy-alcane-diphosphonique ou des acides correspondants, puis la pyrolyse du réactif déshydraté à une température comprise entre 170 et 300 DEG C. Il peut comporter également une étape de conversion des anhydrides formés durant la pyrolyse, ainsi que l'utilisation d'agents de transfert et/ou de bases. Il peut être réalisé sous une pression élevée ou réduite.

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