The conformational analysis of saturated heterocycles. Part LXX. Nitrogen inversions in 1,3,4-oxadiazolidines
Abstract
Free energies of activation for inversion at nitrogen in NN′-disubstituted 1,3,4-oxadiazolidines depend markedly on the bulk of the substituents demonstrating that the steric strain of substituents eclipsed in the transition state is a dominant effect in the nitrogen inversions of substituted hydrazines.