Structural studies of asymmetric hydrogenation. II. The crystal structure of methyl(R(+)-.ALPHA.-methylbenzylamine)bis(dimethylglyoximato)cobalt(III) benzene solvate.

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概要

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• The structure of methyl (<I>R</I>(+)-α-methylbenzylamine)bis(dimethylglyoximato)cobalt(III) benzene solvate has been determined by X-ray crystal analysis. The crystal is orthorhombic; space group, P2<SUB>1</SUB>2<SUB>1</SUB>2<SUB>1</SUB>; <I>Z</I>=4 with <I>a</I>=14.074(1), <I>b</I>=14.390(1), and <I>c</I>=12.202(1) Å. The structure was deduced by the heavy-atom method and refined by the block-diagonal least-squares method to a final <I>R</I> value of 0.063 for 1413 observed reflections. The symmetry of the bis(dimethylglyoximato)cobalt moiety has been lowered from D<SUB>2h</SUB> to C<SUB>2h</SUB> as a result of the steric repulsion from optically active amine. It is proposed that this deformation is a factor inducing the asymmetry in the hydrogenation catalyzed by the complex of bis(dimethylglyoximato)cobalt and the active amine.

• 公益社団法人 日本化学会の論文

著者

• Ohashi Yuji

  Laboratory Of Animal Science Kyoto Prefectural University

• Sasada Yoshio

  Laboratory of Chemistry for Natural Products, Faculty of Science, Tokyo Institute of Technology

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