Synthesis and ROMP activity of aminophenol-substituted tungsten(VI) and molybdenum(VI) complexes

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• 作者：Ari Lehtonen ; Hynek Balcar ; Jan Sedlá ; č ; ek ; Reijo Sillanp4 ; 4
• 关键词：Tungsten ; Molybdenum ; Metathesis ; ROMP ; Imido complexes
• 刊名：Journal of Organometallic Chemistry
• 出版年：2008
• 出版时间：1 April 2008
• 年：2008
• 卷：693
• 期：7
• 页码：1171-1176
• 全文大小：216 K

文摘

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).