Keto–Enol Tautomerism as a Polarity Indicator in Ionic Liquids

Abstract

The keto–enol tautomeric equilibrium for pentane-2,4-dione has been explored in several ionic liquids and these data have been used to give an indication of their polarities in the ground state. The results suggest higher apparent polarities than have been previously indicated by the use of solvatochromatic dyes.