THE ISOMERISM OF THE (ETHYLENEDIAMINE-N,N'-DIPROPIONATO)(ETHYLENEDIAMINE)-COBALT(III) ION AND ITS STEREOSELECTIVE ISOMERIZATION REACTION

被引：21

作者：

KAWAGUCHI, H

MARUYAMA, N

AMA, T

YASUI, T

机构：

来源：

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN | 1992年 / 65卷 / 01期

关键词：

D O I：

10.1246/bcsj.65.175

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Three isomers (one alpha and two beta) of [Co(eddp)(en)]+ were prepared and optically resolved. The stereochemistry was studied on the basis of absorption, CD and C-13 NMR spectral data. Two beta-isomers, beta(e-1) and beta(e-2), were conformational diastereomers arising from a difference of the chirality around one of the asymmetric N atoms in a coordinated eddp ligand. The beta(e-1) half-arrow-right-over-half-arrow-left beta(e-2) change was an inversion reaction at the asymmetric sec-N atom in the in-plane beta-alaninate ring of the coordinated eddp, and the rate was slow. The alpha half-arrow-right-over-half-arrow-left beta(e-1) or beta(e-2) change (coordination-site exchange reaction) was stereoselective and could be explained by the Co-O bond rupture mechanism proposed for Co(III)-edda complexes.

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页码：175 / 179

页数：5

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