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.
羟基
乙腈双膦酸对应以下一般式:##STR1## 其中M代表H或碱的阳离子,以及其盐;一种制备它们的方法包括将与
亚硝酸反应的3-R.sup.1-3-氧代-1-
氨基
丙烷-1,1-
二膦酸对应以下一般式:##STR2## 其中R.sup.1是三级取代烷基,可选择取代的环烷基或可选择取代的芳基或杂环芳基基团,将副产物R.sup.1-COOH和未反应的起始物质从反应混合物中分离出来,通过加入碱使羟基
乙腈双膦酸以盐的形式获得;以及将上述化合物用作络合剂和阈值剂。