Structural Studies of Asymmetric Hydrogenation. V. The Crystal Structures of [(S)-1-Cyanoethyl][(S)(−)-α-methylbenzylamine]bis(dimethylglyoximato)cobalt(III) at 293 K and 173 K
- 1 June 1980
- journal article
- research article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 53 (6) , 1501-1509
- https://doi.org/10.1246/bcsj.53.1501
Abstract
The structure of [(S)-1-cyanoethyl][(S)(−)-α-methylbenzylamine]bis(dimethylglyoximato)cobalt(III) has been determined by X-ray analysis at 293 K and 173 K. The crystal is monoclinic, the space group being P21, Z=2, with a=8.768(2), b=13.356(2), c=9.538(3) Å, and β=96.73(3)° at 293 K, and a=8.617(4), b=13.222(4), c=9.517(7) Å, and β=96.26(7)° at 173 K. The structure was deduced by the heavy-atom method and was refined by the block-diagonal least-squares method to the final R values of 0.051 and 0.060 for 1878 and 1848 observed reflections at 293 K and 173 K respectively. The bis(dimethylglyoximato)cobalt moiety is twisted in the opposite way from that of [(R)-1-cyanoethyl][(S)(−)-α-methylbenzylamine]bis(dimethylglyoximato)cobalt(III). This supports the proposal that the asymmetry of the optically active amine is transferred into the substrate through the twist of the bis(dimethylglyoximato) cobalt moiety in the step of the σ-bond formation.Keywords
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