Premium
Pyrazoles VI: The electron‐releasing capacity of the pyrazole ring
Author(s) -
Wijnberger C.,
Habraken Clarisse L.
Publication year - 1969
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.5570060415
Subject(s) - chemistry , pyrazole , ring (chemistry) , group (periodic table) , electron , position (finance) , medicinal chemistry , stereochemistry , organic chemistry , physics , quantum mechanics , finance , economics
UV and PMR spectral data and CO frequencies of some methylpyrazoles containing in the 3‐, 4‐ or 5‐position, a formyl‐, acetyl‐ or ethoxycarbonyl group are reported. These data confirm earlier conclusions that, in particular, the 4‐pyrazolyl group acts as an electron releasing group. The syntheses of a number of formyl‐, acetyl‐ and ethoxycarbonyl pyrazoles are described. In addition, some 4‐dicyanovinyl‐ and 4‐tricyanovinylpyrazoles were investigated.