Carbon‐13 nuclear magnetic resonance study of a new ring‐chain tautomerism of some pyridazine derivatives
作者:
Rodolfo Nesi,
Stefano Chimichi,
Francesco De Sio,
Mirella Scotton,
期刊:
Organic Magnetic Resonance
(WILEY Available online 1983)
卷期:
Volume 21,
issue 1
页码: 42-45
ISSN:0030-4921
年代: 1983
DOI:10.1002/omr.1270210111
出版商: John Wiley&Sons Limited
数据来源: WILEY
摘要:
AbstractThe13C NMR spectra of a number of pyridazine derivatives have been recorded in DMSO‐d6solution and analysed. Examination of the most diagnostic resonances, with particular emphasis on those arising from the pyridazine ring system, enabled the ready establishment of the presence of a ring‐chain tautomerism in 5‐(o‐aminophenylcarbamoyl)pyridazine‐4‐carboxylic acid, methyl 5‐(o‐aminophenylcarbamoyl)pyridazine‐4‐carboxylate, 5‐(o‐aminophenylcarbamoyl)‐3,6,‐dimethylpyridazine‐4‐carboxylic acid and 5‐(2‐amino‐1,2‐dicyanovinylenecarbamoyl)pyridazine‐4‐carboxylic acid. This gave rise to 3′,4′‐dihydro‐3′‐oxospiro[pyridazine‐5(2H),2′(1H)‐quinoxaline]‐4‐carboxylic acid, methyl 3′,4′‐dihydro‐3′oxospiro[pyridazine‐5(2H),2′(1′H)‐quinoxaline]‐4‐carboxylate, 3′,4′‐dihydro‐3′‐oxo‐3,6‐dimethylspiro[pyridazine‐5(2H), 2′(1′H)‐quinoxaline]‐4‐ca
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