A study of the orbitals of a-aminoacetone and a-aminoacetaldehyde as a function of the two important torsions in these molecules is reported. The individual level shifts are much greater than the variation of the total energy. We identify four significant interactions affecting the level ordering. Each interaction has its distinctive conformational dependence. In order of decreasing spectroscopic importance the interactions are as follows.(1) Through bond coupling of the nitrogen and oxygen lone-pairs. (2) Through space interaction of these lonepairs. (3) Hyperconjugation between the C-N G* level and the carbonyl x-system. (4) Direct overlap of the nitrogen lone-pair with the carbonyl x-system.OUR continuing interest in the interaction of orbitals through space and through bonds prompted us to examine the electronic structure of a series of a-substituted carbonyl compounds (1). This particular
R = H , Me(1) carbonyl grouping was examined for the following reasons. (1) Previous investigations have focused on the interaction between equivalent lone-pairs ; the series (1) serves as a useful prototype for the study of hetero-
for the N02 radical which may indicate association with the 7 bonds of the solvent. The equilibrium constant in benzene deviates from the correlation line in the opposite sense. This deviation may be indicative of a differential complexation effect with the N204 forming a better it complex than N02.Oxidation by Palladium (II). II.1 Products of the Oxidation and Isomerization of Phenylcyclopropane by Palladium (II)2
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