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FT-IR and 13C-NMR Correlations for Some N-Substituted Azoles and Benzazoles

Volume 49, Number 8 (Aug. 1995) Page 1111-1119

Elguero, José; Gil, Manuel; Iza, Nerea; Pardo, Carmen; Ramos, Mar

The FT-IR (in carbon tetrachloride) and 13C-NMR (in deuterochloroform) spectra of six p-substituted aniline derivatives, as reference compounds, and nine 1-p-aminophenyl-azoles and benzazoles were recorded. The measured spectral parameters from FT-IR were symmetric, v3(NH2), and antisymmetric, vas(NH2), stretching fundamentals and their band intensity ratio, A(vas)/A(vs), while the corresponding 13C-NMR parameters were C-1 to C-4 chemical shifts of 1-p-aminophenyl carbons. Different IR and 13C-NMR spectral parameters and Hammett constants σp (or σp-) were correlated, and statistic analysis of the results permitted an estimation of σp values of the nine (azol-1-yl) substituents. An empirical equation to calculate the Hammett constants of new azoles and benzazoles is proposed.