Substituted ethane diphosphonic acids and salts and esters thereof
AssigneeMonsanto Company
InventorAl F. Kerst
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Abstract
New and useful substituted ethane diphosphonic acids and salts thereof as exemplified by the compound having the formula ##EQU1## 2-amino-1-hydroxyethane-1,1-diphosphonic acid and processes for preparing the same which generically comprise the "de-oxiranization" of an epoxy ethane diphosphonate having the formula ##EQU2## wherein R.sub.3 is hydrogen, a metal ion, or an organic radical.
Claims7
An ethane diphosphonate of the formula ##EQU15## wherein each R.sub.3 is individually selected from the group consisting of hydrogen, alkali metal ions, alkaline earth metal ions, ammonium ions and lower alkyl amine ions, and R.sub.1 and R.sub.2 are either hydroxy or -N(R.sub.4).sub.2 groups wherein R.sub.4 is either hydrogen or alkyl, provided that R.sub.1 or R.sub.2, but not both, is always hydroxy.
2-amino-1-hydroxy ethane - 1,1-diphosphonic acid.
Dependencies are inferred from the claim text.