Supporting Information Synthesis of a [(π-Cyano-nacnac)Cp]zirconium Complex and its Remote Activation for Ethylene Polymerization Alan R. Cabrera, † Yanika Schneider ‡ , Mauricio Valderrama, † Roland Fröhlich, § Gerald Kehr, § Gerhard Erker * , § Rene S. Rojas *† † Departamento de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Santiago-22, Chile, ‡ Departments of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106 (USA) § Chemisches Institut der Universität Münster, Corrensstrasse 40, 48149 Münster, Germany. Experimental Section General Remarks. All manipulations were performed under an inert atmosphere using standard glovebox and Schlenk-line techniques. All reagents were used as received from Aldrich unless otherwise specified. Ethylene was purchased from Matheson Tri-Gas (research grade, 99.99 % pure). Toluene, THF, ether and pentane were distilled from benzophenone ketyl. All polymerization reactions were carried out in a Parr autoclave reactor as described below. Toluene for polymerization was distilled from sodium benzophenone. The following instruments were used for the physical characterization of the compounds. NMR: Varian Inova 500 ( 1 H: 500 MHz, 13 C: 126 MHz, 19 F: 470 MHz, 11 B: 160 MHz), Bruker Unity Plus 600 ( 1 H: 600 MHz, 31 C: 151 MHz, 19 F: 564 MHz, 11 B: 64 MHz) and Bruker Advance 400. Most NMR assignments were supported by additional 2D experiments. FT-IR spectra were recorded on a Bruker Vector-22 Spectrophotometer using KBr pellets, and in solution using C 6 D 6 as solvent. X-ray crystal structure analyses: Data sets were collected with Nonius KappaCCD diffractometers, in case of Mo-radiation equipped with a rotating anode generator. S1 of 26