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Title: Syntheses and Structural Characterization of 2,2’- methylene-bis(6-t-butyl-4-methyl-phenoxide)Complexes of Titanium, Zirconium and Tantalum
Authors: Chisholm, Malcolm H.;Huang, Jui-Hsien;Tiedtke, Darin;Huffman, John C.
Contributors: 化學系
Keywords: Chelating diphenoxides;Titanium;Zirconium;Tantalum
Date: 1997
Issue Date: 2012-12-10T01:39:18Z
Publisher: Elsevier
Abstract: The reactions of M(NMe2)n (M = Ti, Zr, n = 4; Ta, n = 5) with 2,2′-methylene-bis(6-t-butyl-4-methylphenol), HO---CH2---OH, in toluene produce Ti(O---CH2z.sbnd;O)2 (1), Zr2(η2---O---CH2---O)2(μ,η1-O---CH2---O)2 (2) and Ta(O---CH2---O)(NMe2)3 (3). Compounds 1 and 2 can also be obtained via metathesis of MCI4 with Li2(O---CH2---O). Reducing (O---CH2---O)TiCl2 with 2 equiv. of Na/Hg also generates 1 by ligand redistribution. Reaction of Zr(NMe2)4 with I equiv. of HO---CH2---OH yields (O---CH2---O)Zr(NMe2)2 (4). Metathesis of TaCl5 with 1 equiv. of Li2(O---CH2---O) produces (O---CH2---O)TaCl3 (5). (O---CH2---O)Ta(NMe2)2Cl (6) is formed from the reaction of 3 with 1 equiv. of trimethylsilylchloride in toluene. The dimethylamide groups of compounds 3 and 4 reveal dynamic behavior on the NMR time-scale. The compounds 1, 2 and 3 have been characterized by single-crystal X-ray crystallography.Ltd
Relation: Polyhedron, 16(17): 2941-2949
Appears in Collections:[化學系] 期刊論文

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