Acid-Base Equilibria in Nonpolar Media. 1. A Spectrophotometric Method for Acidity Measurements in Heptane.
A UV-vis spectrophotometric method for measurements of relative acidities in heptane has been developed. The phosphazene base t-BuP(4) is used as the deprotonating agent. Its protonated form is a good counterion for the anions of the acids because it is bulky, has delocalized charge, and therefore does not have specific interactions with the anions. A self-consistent scale of relative acidities in heptane spanning for 3 pK(a) units has been constructed.
Leito
Ivo
I
Department of Chemistry, Tartu University, EE2400 Tartu, Estonia, Chemisches Laboratorium, Institut für Organische Chemie und Biochemie, Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany, and Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia.
Rodima
Toomas
T
Koppel
Ilmar A.
IA
Schwesinger
Reinhard
R
Vlasov
Vladislav M.
VM