## 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
NMR study of antipyrine adducts with lanthanide shift reagents. Molecular structure of 2,3-dimethyl -1-phenyl- 5-ethoxypyrazole
✍ Scribed by E. I. Oblapenko; A. V. Polyakov; A. I. Ermakov; A. I. Yanovskii; A. V. Krylov; V. G. Voronin; Yu. T. Struchkov
- Book ID
- 104783177
- Publisher
- Springer US
- Year
- 1989
- Tongue
- English
- Weight
- 447 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0009-3122
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📜 SIMILAR VOLUMES
## Abstract X‐ray analysis of a crystalline product obtained by treatment of 5‐ethylthieno[2,3‐__b__]pyridine with excess acidified hypochlorite establishes its stereochemistry as __trans__‐2,3‐dichloro‐5‐ethyl‐2,3‐dihydrothieno‐[2,3‐__b__]pyridine __syn__‐1‐oxide (5), wherein the pyridine ring is
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