Facile Formation of Hexacyclic [Al3O2Cl] Aluminum and Alkoxide-Bridged Titanium Complexes: Reactions of AlMe3 with [Ti(L)Cl2] [L = 2,2′-Methylenebis(6-tert-butyl-4-methylphenolato)]

✍ Scribed by Dao Zhang

• Book ID: 102168201
• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 136 KB
• Volume: 2007
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200601227

✦ Synopsis

Abstract

The titanium dichloride complex [(L)TiCl~2~] [L = 2,2′‐methylenebis(6‐__tert‐__butyl‐4‐methylphenolato)] (1) reacted with trimethylaluminum (AlMe~3~) in a 1:2 ratio to give a trimetallic aluminum complex of the composition [(L)(AlMe~2~)~3~(μ‐Cl)] (2) with a symmetric six‐membered ring [Al~3~(μ~2~‐O)~2~(μ~2~‐Cl)] and a four‐coordinate aluminum center in the solid state. The reaction of 1 equiv. AlMe~3~ gave [(L)TiMeCl] (3), which could absorb O~2~ gas to afford the oxygen‐insertion product [{(L)TiCl}~2~(μ‐OMe)~2~] (4) with a five‐coordinate metal center. Upon reaction of H~2~L with AlMe~3~, the binuclear, four‐coordinate adduct [{(L)AlMe}~2~] (5) was formed. Complex 4 supported on MgCl~2~ and activated with aluminum alkyls reveals high catalytic activity for ethylene polymerization to produce polymers with molecular weight distributions of ca. 3.1. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)