Tetrabutylammonium Hydroxide as Titrant for Acids in Nonaqueous Solutions

Fluorometric Determination of 0.1 to 10 Micrograms of Cholesterol

Basic Behavior of Molecules and Ions in Acetic Anhydride

Separation of 2,4-Dinitrophenylhydrazones of Aldehydes and Ketones by Paper Chromatography

The protonation equilibrium of six β-carbolines has
been studied in organic media. The pKa values in
acetonitrile were determined by spectrophotometric methods. The
pKa values in the first excited singlet state
(pKa*) were calculated from the Forster cycle
and the values compared with those obtained by fluorimetric titration.
It is concluded that the acid–base equilibrium is not established
during the lifetime of the excited state. The differences between the
pKa of the ground and the electronic excited singlet
states in different organic media (MeOH, EtOH, PriOH,
ButOH, MeCN and CH2Cl2) were
also calculated.

Charles W. Pifer

Papers

Titration of Pharmaceuticals in Nonaqueous Solvents