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A 1 H and 13 c Nmr study of the structure and tautomerism of 4‐pyrazolylpyrazolinones
Author(s) -
Elguero J.,
Martíanez A.,
Singh S. P.,
Grover M.,
Tarar L. S.
Publication year - 1990
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570270409
Subject(s) - chemistry , tautomer , yield (engineering) , dehydroacetic acid , medicinal chemistry , organic chemistry , materials science , metallurgy
It has been established that the primary reactions products between dehydroacetic acid and p ‐chlorophenylhydrazine or 4‐phenylthiazol‐2‐ylhydrazine are 4‐acetylacetyl‐5‐hydroxypyrazoles. These compounds react with the above hydrazines to yield 4‐(pyrazol‐5′‐yl)‐2‐pyrazolin‐5‐ones which exist in solution as 5‐hydroxypyrazoles.