Process for preparing vinylphosphonic acid

Details Process for preparing vinylphosphonic acid Process for preparing vinylphosphonic acid

C - Chemistry, Metallurgy

07

F

260/501.3

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

Patent

CA 1185262

Abstract of the disclosure: Process for preparing vinylphosphonic acid, by heating dialkyl 2-acetoxyethanephosphonates of the general formula Image in which R denotes alkyl groups having 1 to 4 carbon atoms, at 150 to 270°C in the presence of acid or basic catalysts, reacting the resulting reaction product with orthoesters of the general formula R'C(OR)3 in which R' denotes hydrogen, C1-C4-alkyl or C1-C4-alkoxy and R denotes alkyl groups having 1 to 4, preferably 1 to 2, carbon atoms, at 30 to 200°C and hydrolyzing the resulting vinylphosphonic acid diester with water at tem- peratures between 130 and 230°C while simultaneously distilling off the alcohols formed.

403374

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