Polarity and acidity of solvents. Part 3. Polarity of non-aromatic polychloro-substituted solvents
Abstract
The empirical solvent polarity parameters ET(30), (π*), and (G) have been measured for thirty-four non-aromatic polychloro-substituted solvents. The ET(30) values of these polychloro-substituted solvents, determined by means of the betaine dyes (1a) and (1b), are practically insensitive to the solvent polarizability, as previously found for the corresponding ET(30) values of hydrocarbon and aromatic solvents. The difference between the empirical solvent parameters ET(30), (π*), (G), and * for these three groups of solvents (i.e. alkanes, polychloroalkanes, and aromatics) stems above all from their different susceptibility to solvent polarizability. For those polychloroalkanes capable of solute ⋯ H–C hydrogen bonding, the empirical solvent parameters depend also on their different sensitivity to the C–H acidity of the solvent.