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Siglinde Hemmann

Helmut Blum

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

Olefinic diphosphonic acids, a process for their production, their use

Hydroxyacetonitrile diphosphonic acid corresponding to the following general formula ##STR1## in which M represents H or a cation of a base, and salts thereof; to a process for their preparation comprising reacting 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 a tertiary substituted alkyl group, an optionally substituted cycloalkyl group or an optionally substituted aryl or heteroaryl radical, with nitrous acid, the secondary product R.sup.1 -COOH and unreacted starting material are separated off from the reaction mixture and the hydroxyacetonitrile diphosphonic acid is obtained in the form of a salt by addition of a base; and to the use of the above compounds as complexing agents and as thresholders.

Hydroxyacetonitrile diphosphonic acid, a process for its production, and

Oxa-alkane polyphosphonic acids corresponding to general formula (I) ##STR1## in which R.sup.1 is a C.sub.1 -C.sub.10 alkyl group, an optionally substituted C.sub.6 -C.sub.10 aryl group, a phenyl- or naphthylalkyl group, a group having the general formula ##STR2## or a group having the general formula ##STR3## R.sup.2 represents H or methyl, A represents the structural unit ##STR4## where n is an integer of from 1 to 20 and M represents H or the cation of a base, to the use of the above compounds as complexing agents and as thresholders, and to compositions containing one or more compounds of general formula (I).

Oxa-alkane polyphosphonic acids, their use as thresholders, and

A reaction medium of ethanol condensed with 1-20, most preferably 4-6 moles, of ethylene or propylene oxide per mole of ethanol greatly improves the practicality of the preparation of azacycloalkane-2,2-diphosphonic acids of the general formula I: ##STR1## where R means a hydrogen or a lower alkyl radical with from 1 to 3 carbon atoms, and n means an integer between 3 and 11, by phosphonylating the corresponding lactams with phosphonic acid and phosphorous trihalides in the presence of water.

Process for synthesis of azacycloalkane-2,2-diphosponic acids

3-Alkyl-3-oxo-1-aminopropane-1,1-diphosphonic acids and water-soluble salts thereof corresponding to the formula ##STR1## in which R.sup.1 represents an unbranched or branched C.sub.1 -C.sub.8 alkyl group, R.sup.2 and R.sup.3 independently of one another represent methyl or ethyl, and each M represents H or a cation of a water-soluble base, to a process for producing these compounds wherein oxonitriles corresponding to the formula: ##STR2## in which R.sup.1, R.sup.2 and R.sup.3 are as defined above, are reacted with mixtures of a phosphorus trihalide PX.sub.3, where X represents fluorine, chlorine or bromine, with phosphorous acid, the reaction mixture is hydrolyzed, and the reaction products are optionally converted into water-soluble salts; and to the use of the resulting compounds corresponding to general formula (III).

Diphosponylated oxonitriles, processes and uses therefor, and

4-Dimethylamino-1-hydroxybutane-1,1-diphosphonic acid and water-soluble salts thereof, methods for their preparation, and uses thereof as complexing agents.

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Meerbusch, Germany

Siglinde Hemmann