Bei der Umsetzung von w‐Dialkylamino‐carbonsäuren (I) mit phosphoriger Säure und Phosphortrichlorid in Chlorbenzol bei 100°C entstehen die w‐Dialkylamino‐hydroxyalkyliden‐bisphosphonsäuren (II) als amorphe Pulver, die sich beim Stehen an der Luft zu farblosen Ölen verflüssigen und in Wasser löslich sind.
A novel complexone, 2-dimethylaminoethytidenediphosphonic acid, was synthesized. Its acid-base and complexation properties were studied by potentiometric titration in aqueous solutions (25 ~ and compared to those of 2-amino-l-hydroxyethylidenediphosphon ic acid and ~-aminoalkylidenediphosphonic analogs. Parameters of efficiency and selectivity of complexation were determined. The influence of the alkylidene chain length on complexone properties in a series of ~-aminoalkylidenediphosphonic acids was analyzed.
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