Process for preparing pyrrolidone-5,5-diphosphonic acids

Details Process for preparing pyrrolidone-5,5-diphosphonic acids Process for preparing pyrrolidone-5,5-diphosphonic acids

C - Chemistry, Metallurgy

07

F

260/324

C07F 9/65 (1980.01)

Patent

CA 1043341

A B S T R A C T Pyrrolidone-5,5-diphosphonic acids having the formula Image wherein R is a member selected from the group consisting of hydrogen and alkyl having from 1 to 6 carbon atoms; as well as their water-soluble salts. The pyrrolidone- 5,5-aiphosphonic acids are excellent sequestering agents especially for alkaline earth metal ions. They are stabi- lizers for percompounds and are useful in the delaying of the setting times for gypsum. This divisional application is particularly directed to the process of preparing said diphosphonic acids by (1) reacting a compound of the formulae Image and Image with at least the stoichiometric amount of a phosphorus re- actant selected from the group consisting of phosphorus tri- halide and a mixture of a phosphorus trihalide and phosphorous acid, (2) subjecting the resulting product of an aqueous hydro- lysis at an elevated temperature and (3) recovering the desired diphosphonic acid derivative.

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