| 摘要 |
1316025 Preparing 1 - amino - alkane -1,1- diphosphonic acids HENKEL & CIE GmbH 5 Oct 1971 [6 Oct 1970] 46207/71 Heading C2P 1 - Aminoalkane - 1,1 - diphosphonic acids of the general formula wherein R is a hydrocarbon or substituted hydrocarbon residue having 1 to 12 carbon atoms are obtained by reacting an organic nitrile (RCN) with phosphorous acid in the presence of a hydrogen halide, e.g. HCl, HBr or HI. The reaction may be carried out in the presence of an inert solvent, e.g. benzene, toluene, CCl 4 , CHCl 3 , nitromethane or tetrachloroethane. Examples are given for the production of compounds in which R is CH 3 , C 2 H 5 , C 9 H 19 , -CH 2 (COOH), C 6 H 5 , and C 6 H 5 CH 2 respectively. The products are useful as complex-forming compounds, e.g. in water softening or bottle washing, and as additives to dyebaths for textiles. |
