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Abstract

3-R.sup.1 -3-oxoprop-1-ene-1,1-diphosphonic acids corresponding to the following general formula ##STR1## in which R.sup.1 is a tertiary substituted alkyl group, an optionally substituted cycloalkyl group, or an optionally substituted aryl or heteroaryl group, and M is hydrogen or the cation of a base; to a process for their production in which 3-R.sup.1 -3-oxo-1-aminopropane-1,1-diphosphonic acids corresponding to the following general formula ##STR2## in which R.sup.1 is as defined above, are reacted with an aqueous or alcoholic alkali metal hydroxide solution; then water followed by an alcohol infinitely miscible with water is added to the reaction mixture, and the pure olefinic diphosphonic acids are obtained by addition of an acid; to the use of the above compounds of formula III as complexing agents and as thresholders; and to compositions containing one or more compounds of formula (III).

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First Claim