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Extraction of thorium(IV) as perchlorate and chloroacetate complexes with 1-phenyl-2,3-dimethyl-5-pyrazolone (antipyrine)

✍ Scribed by Roopa Bose; D. S. R. Murty; G. Chakrapani

Publisher: Springer
Year: 2005
Tongue: English
Weight: 634 KB
Volume: 265
Category: Article
ISSN: 1588-2780
DOI: 10.1007/s10967-005-0795-5

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## Abstract A facile procedure for preparing 4‐fluoroantipyrine is reported. Treatment of antipyrine with molecular fluorine gives 4‐fluoroantipyrine (3) and 4,4‐difluoro‐3‐hydroxy‐2,3‐dimethyl‐1‐phenylpyrazolidin‐5‐one (2). The product distribution depends on the ratio of antipyrine and molecular