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Synthesis and ROMP activity of aminophenol-substituted tungsten(VI) and molybdenum(VI) complexes |
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| Authors: | Ari Lehtonen,Hynek Balcar,Reijo Sillanpä ä |
| Affiliation: | a Department of Chemistry, University of Turku, FIN-20014 Turku, Finland b J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 182 00 Prague 8, Czech Republic c Department of Physical and Macromolecular Chemistry, Charles University in Prague, Faculty of Science, Hlavova 2030, CZ-128 40, Prague 2, Czech Republic d Department of Chemistry, University of Jyväskylä, FIN-40351 Jyväskylä, Finland |
| Abstract: | Tungsten(VI) and molybdenum(VI) complexes [MO(L1)Cl2] and [M(X)(L2)Cl3] (X = O, NPh) with tridentate aminobis(phenolate) ligand L1 = methylamino-N,N-bis(2-methylene-4,6-dimethylphenolate) and bidentate aminophenolate ligand L2 = 2,4-di-tert-butyl-6-((dimethylamino)methyl)phenolate) were prepared and characterised. These complexes are principally stable in open atmosphere under ambient conditions. When activated with Et2AlCl, they exhibited high activity in ring-opening metathesis polymerisation (ROMP) of 2-norbornene (NBE) and its derivatives. Especially complexes [M(NPh)(L2)Cl3], which are easily available from corresponding metal oxides MO3 by a simple three-step synthesis, were found very efficient ROMP catalysts for NBE (M = Mo, W) and 2-norbornen-5-yl acetate (M = Mo). |
| Keywords: | Tungsten Molybdenum Metathesis ROMP Imido complexes |
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