Substituent effects on ionisation and (13)C NMR properties of some monosubstituted phenols A potentiometric, spectrophotometric and (13)C NMR study.
The pK(a) values of ionisation of a set of phenols ortho, meta and para substituted are studied by spectrophotometry and (13)C 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.
Crisponi
Guido
G
Dipartimento di Chimica Inorganica e Analitica, Università di Cagliari, Complesso Universitario di Monserrato, 09042 Monserrato, Cagliari, Italy.
Casu
Mariano
M
Nurchi
Valeria Marina
VM
Cesare-Marincola
Flaminia
F
Pivetta
Tiziana
T
Silvagni
Roberta
R