Keywords
f-block elements
2,3-bis(diphenylphosphoryl)pyrazine
2,3,5,6-tetrakis(diphenylphosphoryl)pyrazine
complexes
extraction
organophosphorus compounds
pyrazines
quinoxalines
X-ray diffraction analysis
Abstract
2,3-Bis- and 2,3,5,6-tetrakis(diphenylphosphoryl)-substituted pyrazines have been synthesized from the corresponding polychloropyrazines and ethyl diphenylphosphinite. They may serve as new N,O-bidentate organophosphorus ligands for extraction and recovery of f-block metal ions from nitric acid solutions.
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