Dbf–ruthenocenes: Towards chiral halfsandwich Lewis acidic Dbf complexes
摘要:
In order to develop a new class of chiral metallocene catalysts, halfsandwich ruthenocenes of dibenzo[c,g]fluorenide (Dbf (1)) have been prepared. Structural and spectroscopic characterization of (eta(5)-Dbf)Ru(PPh3)(2)Cl and [(eta(5)-Dbf)Ru(PPh3)(2)(NCMe](+)[SbF6] provide evidence for strong metal-ligand binding in these sterically crowded complexes. In the solid state the complexes assume conformations ideal for transfer of the stereo information unto a prochiral substrate. (C) 2011 Elsevier B.V. All rights reserved.