Oxiranylidene-2,2-bis(phosphonate): Unambiguous Synthesis, Hydrolysis to 1,2-Dihydroxyethylidene-1,1-bis(phosphonate), and Identification as the Primary Product from Mild Na2WO4/H2O2 Oxidation of Ethenylidene-1,1-bis(phosphonate)
N-Substituted 2-aminoethylidenediphosphonic acids as complexones
摘要:
A novel complexone, 2-dimethylaminoethylidenediphosphonic acid, was synthesized. Its acid-base and complexation properties were studied by potentiometric titration in aqueous solutions (25 degrees C) and compared to those of 2-amino-1-hydroxyethylidencdiphosphonic acid and omega-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 omega-aminonlkylidcnediphosphonic acids was analyzed.