Proton magnetic resonance studies of pyrazoles was written by Tensmeyer, L. G.;Ainsworth, C.. And the article was included in Journal of Organic Chemistry in 1966.Application of 10199-53-8 This article mentions the following:
4-Proton chem. shift data for 54 pyrazoles are correlated in the empirical equation δ4 = δ4(s) + α1 + α3 + α5, where δ4(s) is a constant for each solvent, and α1, α3, and α5 are empirical constants that represent the effect of replacing a methyl substituent by another group at positions 1, 3, and 5 of the pyrazole nucleus. The equation can be used for isomer identification and for the study of tautomers. The α constants of the equation are correlated with Hammett σ constants In the N.M.R. spectra, a phenyl group attached to a pyrazole ring appears as a multiplet resonance unless a substituent is α to it. Under the latter condition the phenyl resonance is a singlet. Chem. shift data are used to distinguish relative coplanarity of the phenyl and pyrazole rings. Ring proton coupling constants of pyrazoles are discussed. In the experiment, the researchers used many compounds, for example, 1-Methyl-5-phenyl-1H-pyrazole-3-carboxylic acid (cas: 10199-53-8Application of 10199-53-8).
1-Methyl-5-phenyl-1H-pyrazole-3-carboxylic acid (cas: 10199-53-8) belongs to pyrazole derivatives. Pyrazole and its derivatives are considered a pharmacologically important active scaffold that possesses almost all types of pharmacological activities. Pyrazoles and pyrimidines have diverse biological and pharmacological activities. There are a number of antimicrobial compounds containing pyrazole moiety as the core unit. Pyrazofurin is important antimicrobial drug and 2-methylpyrimidine-4-ylamine derivatives I and II were found to be effective inhibitors of Escherichia coli PDHc-E1 with antibacterial and antifungal activity.Application of 10199-53-8
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics