Nitrogen bridgehead compounds. Part 75. Study of tautomerism of 9-oxalyl derivatives of condensed pyrimidinones by 1H and 13C nuclear magnetic resonance and ultraviolet spectroscopy
Abstract
The tautomerism of the title compounds has been investigated by 1H and 13C n.m.r. and u.v. spectroscopy. The effect of ring size, substituents, and various annellations of the tautomerism have also been studied. The ring size has been found to be decisive from the point of view of tautomerism.