Association constants of anionic-protactinium (V) complexes
Abstract This study was undertaken to investigate the interaction of aqueous protactinium with various monobasic acids at an ionic strength and acidity of 1·00. This present work adds to the existing information on the anionic complexing of protactinium which was collected at an ionic strength of 3 and an acidity of 1–3 N. The solvent extraction method involves the measurement of the distribution of protactinium (Pa-233) between various aqueous solutions and a benzene phase containing the bidentate chelating agent, thenoyltrifluoroacetone (TTA).
FIELD: chemistry. SUBSTANCE: invention concerns process of production of diisopropyl {[1-(hydroxymethyl)-cyclopropyl]oxy}methylphosphonate represented by the formula , which is the key intermediate compound in synthesis of antiviral nucleoside analogue. The invention also concerns new intermediate compounds of formulae and , and their production of compound (2) obtained under this invention, which is an antiviral nucleoside analogue (especially against hepatitis B virus) represented by the formula . EFFECT: high purity grade and high output. 4 ex