The Molecular Structure of Bromo(ethyl)[(−)-sparteine]magnesium(II), a Catalyst for the Asymmetric-selective Polymerization of Racemic Methacrylates
- 1 May 1983
- journal article
- research article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 56 (5) , 1319-1321
- https://doi.org/10.1246/bcsj.56.1319
Abstract
The molecular structure of EtMgBr-(−)-sparteine, which initiates asymmetric (enantiomer) selective polymerization of racemic methacrylates, has been determined by means of X-ray diffraction. The crystal is orthorhombic, space group P212121, a=11.278(2), b=14.112(3), c=11.746(2) Å, Z=4. The structure was established by the heavy atom method and refined by the block-diagonal least-squares procedure: R=0.100 for 1272 non-zero reflections. The Mg atom is tetrahedrally coordinated by the Et group, Br and two N atoms of the (−)-sparteine.Keywords
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