The conformational analysis of saturated heterocycles. Part 92. Conformational equilibria of 1,2-dioxa-4,5-diazacyclohexanes
Abstract
Proton and 13C n.m.r. spectra indicate that 4,5-dimethyl- and 4,5-diethyl-1,2-dioxa-4,5-diazacyclohexanes exist very predominantly in the equilibrating ax–eq and/or ax–ax conformations: for the di-isopropyl analogue this co-exists with ca. 20% of the eq–eq conformer.