SUBSTITUENT EFFECTS ON THE N-15 MMR PARAMETERS OF AZOLES

The N-16 chemical shifts and a large collection of coupling constants pertaining to azoles have been gathered from the literature. To comple te this collection and to check some anomalies, the spectra of 14 comp ounds in several solvents were recorded again and 31 compounds were st udied for the first time; in all, data for 420 compounds (pyrroles, im idazoles, pyrazoles, triazoles, tetrazoles, indoles, benzimidazoles, i ndazoles, benzotriazoles and carbazoles) are reported. Additive models are used to discuss the substituent chemical shifts.