Acid-base equilibria in nonpolar media. Absolute pK(a) scale of bases in tetrahydrofuran.
The acidity constants (pKa) of 11 bases (amines, anilines, pyridines, pyrrolidines, and iminophosphoranes) have been determined in tetrahydrofuran by potentiometry, complemented by conductometric measurements. The pK(a) values of the studied bases cover a wide absolute pH range of acidity in tetrahydrofuran, from 7.4 to 21.7. From the pK(a) values obtained, a scale of absolute acidity in tetrahydrofuran has been established, which has allowed calculation of the absolute pKa values of 77 bases from literature relative pK(a) data.
Garrido
Gemma
G
Departament de Química Analítica, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.
Koort
Eve
E
Ràfols
Clara
C
Bosch
Elisabeth
E
Rodima
Toomas
T
Leito
Ivo
I
Rosés
Martí
M