Mono(amidinate) Yttrium Alkyl Complexes: The Effect of Ligand Variation on Ethene Polymerization Catalysis

Yttrium dialkyl complexes were prepared for three different 2,6-diisopropylphenyl-substituted benzamidinate ligands. The electron-donating ability of the parent ligand (L1) was decreased by a pentafluorophenyl backbone substituent (L2), and enhanced by addition of a pendant Lewis base (L3). The corresponding cationic monoalkyl species were generated and compared in catalytic ethene polymerization.

[1]  H. Tsurugi,et al.  Neutral versus cationic Group 3 metal alkyl catalysts: performance in intramolecular hydroamination/cyclisation. , 2006, Dalton transactions.

[2]  S. Arndt,et al.  Cationic alkyl complexes of the rare-earth metals: Synthesis, structure, and reactivity , 2005 .

[3]  M. W. Bouwkamp,et al.  One ligand fits all: cationic mono(amidinate) alkyl catalysts over the full size range of the group 3 and lanthanide metals. , 2004, Journal of the American Chemical Society.

[4]  Paul G. Hayes,et al.  Scandium-Catalyzed Intramolecular Hydroamination. Development of a Highly Active Cationic Catalyst , 2004 .

[5]  B. Hessen,et al.  Yttrium Alkyl Complexes with Triamino−Amide Ligands , 2004 .

[6]  B. Hessen,et al.  Neutral and cationic alkyl and alkynyl complexes of lanthanum: Synthesis, stability, and cis-selective linear alkyne dimerization , 2004 .

[7]  A. Mortreux,et al.  Group 3 metal catalysts for ethylene and α-olefin polymerization , 2004 .

[8]  J. H. Teuben,et al.  Yttrium alkyl complexes with a sterically demanding benzamidinate ligand: synthesis, structure and catalytic ethene polymerisation. , 2003, Chemical communications.

[9]  W. Piers.  Non-cyclopentadienyl ancillaries in organogroup 3 metal chemistry: a fine balance in ligand design , 2002 .

[10]  Paul G. Hayes,et al.  Cationic scandium methyl complexes supported by a beta-diketiminato ("Nacnac") ligand framework. , 2002, Journal of the American Chemical Society.

[11]  J. H. Teuben,et al.  Neutral and cationic yttrium alkyl complexes with linked 1,4,7-triazacyclononane-amide monoanionic ancillary ligands: synthesis and catalytic ethene polymerisation , 2001 .

[12]  J. H. Teuben,et al.  Yttrium alkyl and benzyl complexes with amino-amidinate monoanionic ancillary ligands , 2000 .

[13]  Thomas P. Spaniol,et al.  Halbsandwich-Alkyl- und Hydridoyttriumkomplexe: einfache Synthese und Polymerisationskatalyse polarer Monomere , 1999 .

[14]  J. H. Teuben,et al.  An amidinate ligand with a pendant amine functionality; synthesis of a vanadium(III) complex and ethene polymerization catalysis , 1998 .

[15]  Y. Mu,et al.  Use of Alkane Elimination in the One-Step Synthesis of Organoscandium Complexes Containing a New Multidentate Cyclopentadienyl Ligand , 1996 .

[16]  M. Lappert,et al.  Stable silylmethyl and neopentyl complexes of scandium(III) and yttrium(III) , 1973 .

[17]  K. Hess.  Zur Konstitution der Verbindungen von Cellulose mit Metallbasen , 1925 .