The pK(a) values of ionisation of a set of phenols ortho, meta and para substituted are studied by spectrophotometry and C-13 NMR spectroscopy. A dual substituent analysis of equilibrium and NMR results, according to the Swain and Lupton procedure, is presented. The results of this analysis allow the assignment of the contribution of field and resonance contributions, both on equilibrium constants and chemical shifts.

Substituent effects on ionisation and 13C NMR properties of some monosubstituted phenols. A potentiometric, spectrophotometric and 13C NMR study

CRISPONI, GUIDO;CASU, MARIANO;NURCHI, VALERIA MARINA;CESARE MARINCOLA, FLAMINIA;PIVETTA, TIZIANA;
2002-01-01

Abstract

The pK(a) values of ionisation of a set of phenols ortho, meta and para substituted are studied by spectrophotometry and C-13 NMR spectroscopy. A dual substituent analysis of equilibrium and NMR results, according to the Swain and Lupton procedure, is presented. The results of this analysis allow the assignment of the contribution of field and resonance contributions, both on equilibrium constants and chemical shifts.
2002
potentiometry; UV-Vis spectroscopy; C-13 NMR chemical shift; ionisation constants; fibre optics; substituent effect; Swain-Lupton constants
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/1830
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