Chromone Studies. Part 9.1 Dynamic NMR Analysis of Rotational Isomerism in 2-(N,N-Dialkylamino)chromones
Abstract
Dynamic 1H NMR spectroscopy has been used to explore the influence of substituents on the internal rotation of the amino group in a series of twelve 2-(N,N-dialkylamino)chromones; the rotational barriers (ΔG‡) in CDCl3 and CD2Cl2 were found to range from 38 to 52 kJ mol-1.