N-Carboxy alkyl amino alkane polyphosphonic acids

Details N-Carboxy alkyl amino alkane polyphosphonic acids N-Carboxy alkyl amino alkane polyphosphonic acids

1978-07-20

1981-12-22

Evans, Joseph E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

210700, 252180, 26050112, C07F 938, C02B 514

Patent

active

043070388

ABSTRACT:
Novel N-carboxy alkyl amino alkane polyphosphonic acids which have more than two carbon atoms in their carboxy alkyl group, and their alkali metal salts are prepared in a good yield by reacting alkali metal salts of amino alkane phosphonic acids in which at least one hydrogen atom of the amino group is unsubstituted, in an alkaline medium with an .alpha., .beta.-unsaturated carboxylic acid at increased temperature. The free acids are preferably recovered from the reaction solution by a treatment with a cation exchange agent. In place of the .alpha., .beta.-unsaturated carboxylic acids there can also be used their anhydrides, esters, or nitriles. The resulting polyphosphonic acids have a good complexing or sequestering effect on polyvalent metal ions.

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Sommer et al., "Chem. Abstracts", vol. 82 (1975), p. 460.

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