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NMR studies in the heterocyclic series. XXXII. Carbon-13 NMR study of N-arylpyrazoles and N-arylpyrazolium salts

✍ Scribed by Antonio De La Hoz; Maria Del Carmen Pardo; José Elguero; Alain Fruchier

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
253 KB
Volume
27
Category
Article
ISSN
0749-1581

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✦ Synopsis

A comparative study of the 13C chemical shifts and the 'H-13C and 19F-13C coupling constants of N-arylpyrazoles, pyrazolium salts and 2-methyl-and 2-vinylpyrazolium quaternary salts has been carried out. The effect of introducing a substituent at positions 2 and 5 of the pyrazole ring on the conjugation between the heterocycle and the N-phenyl group has been studied.

KEY WORDS "C NMR

Chemical shifts J(CH) and J(FC) N-Arylpyrazoles N -Arylpyrazolium salts ' H-'H and ' H-' 3C COSY experiments, and permit an evaluation of linear vs. angular endo and ex0 ketone orientation on the NMR parameters.

KEY WORDS "C NMR 'H N M R Tricyclic aromatic ketones

Linear and angular effects

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