申请人:Henkel & Cie G.m.b.H.
公开号:US04006182A1
公开(公告)日:1977-02-01
Process for the preparation of 1-aminoalkane-1,1-diphosphonic acids of the formula ##STR1## in which R.sub.1 represents a member selected from the group consisting of alkyl with 1 to 20 carbon atoms, phenyl, phenylalkyl with 7 to 12 carbon atoms, alkylphenyl with 7 to 12 carbon atoms, and in which R.sub.2 represents a member selected from the group consisting of hydrogen and alkyl with 1 to 4 carbon atoms, consisting essentially of reacting adducts of a hydrogen halide selected from the group consisting of HCl and HBr to a corresponding carboxylic acid amide of the formula R.sub.2 --NH--CO--R.sub.1 wherein R.sub.1 and R.sub.2 have the above-assigned meanings, with phosphorus acid; and recovering said 1-aminoalkane-1,1-diphosphonic acids.
制备式为##STR1##中的1-氨基烷基-1,1-二膦酸的过程,其中R.sub.1表示选择自由基群的一员,该自由基群由1至20个碳原子的烷基、苯基、7至12个碳原子的苯基烷基、7至12个碳原子的烷基苯基组成;R.sub.2表示选择自由基群的一员,该自由基群由氢和1至4个碳原子的烷基组成,基本上包括将HCl和HBr中选择的氢卤素加合物与式为R.sub.2 --NH--CO--R.sub.1的相应羧酸酰胺(其中R.sub.1和R.sub.2具有上述分配的含义)与磷酸反应;并回收所述的1-氨基烷基-1,1-二膦酸。