NEW ETHYLENE BRIDGED MONOFLUORENYL-AMIDO GROUP-4 COMPLEXES

9-[(2-t-Butylamino)ethyl] fluorene (1) was synthesized by the use of ( 1-chloro-2-t-butylamino)ethane (3) which provided convenient routes to 1 as well as 3-[(2-t-butylamino)ethyl] indene (7). Deprotonation of 1 with 2 equivalents of butyllithium followed by addition of ZrCl4 or H fCl4 led to eta(1)-t-butylamido)-2-(eta(5)-9-fluorenyl)ethane] zirconi um (8) and hafnium (9) dichloride, respectively. Complexes 8 and 9 whe n activated with methylaluminoxane (MAO) are active catalysts for the polymerization of ethylene. (C) 1997 Elsevier Science B.V.