Process for preparing polycarboxylic acid imidazolines by condensation reaction

US5151522A · kind A · utility

Assignees

• Chemisches Institut Schaefer AG · CH
• Joh A. Benckiser, GmbH · DE

Inventors

• Hans Hitz · Arisdorf, CH
• Rolf Schaefer · Mainz, DE
• Heinrich Baust · Plankstadt, DE
• Wolfgang Gross · Unterföhring, DE

Key dates

• Filing date: Jul 22, 1991
• Grant date: Sep 29, 1992
• Expiry date: Jul 22, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D3/3472
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The present invention provides a process for preparing polycarboxylic acid imidazolines of the general formula: ##STR1## wherein X is --Cl, --OH, --O--SO.sub.3 H, --O--PO.sub.3 H.sub.2, --O--CH.sub.2 --CH.sub.2 --COOH, --NH.sub.2, --NHalk or --N(alk).sub.2, alk being an alkyl radical containing up to 6 carbon atoms, n is a whole number of from 2 to 4, R is a C.sub.8 -C.sub.18 hydrocarbon radical which is straight-chained, branched, saturated or one to three times unsaturated, m is a whole number of from 2 to 5, R' is a hydrogen atom or a carboxyl group and R" is a hydrogen atom or a methyl radical. In the process, a compound of the formula ##STR2## in which R, X and n are as defined above, is condensed with about a 2- to 5-fold excess of acrylic acid, methacrylic acid, maleic acid or a mixture thereof.