Chiral <i>Ansa</i> Metallocenes with Cp Ring-Fused to Thiophenes and Pyrroles: Syntheses, Crystal Structures, and Isotactic Polypropylene Catalysts
作者:John A. Ewen、Michael J. Elder、Robert L. Jones、Arnold L. Rheingold、Louise M. Liable-Sands、Roger D. Sommer
DOI:10.1021/ja004266h
日期:2001.5.1
Syntheses, crystalstructures, and polymerization data for new isospecific metallocenes (heterocenes) having cyclopentenyl ligands b-fused to substituted thiophenes (Tp) and pyrroles (Pyr) are reported. The C2- and C1-symmetric heterocenes are dimethylsilyl bridged, have methyl groups adjacent to the bridgehead carbon atoms, and have aryl substituents protruding in the front. rac-Me2Si(2,5-Me2-3-P