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trans-Disubstituted diamido/diamine cyclam zirconium complexes

Titletrans-Disubstituted diamido/diamine cyclam zirconium complexes
Publication TypeJournal Article
Year of Publication2008
AuthorsMunha, RF, Alves, LG, Maulide, N, Duarte, MT, Marko, IE, Fryzuk, MD, Martins, AM
JournalInorganic Chemistry Communications
Volume11
Pagination1174-1176
Date PublishedOct
Type of ArticleArticle
ISBN Number1387-7003
Keywordsamido ligands, CATALYSTS, CHEMISTRY, CONTAIN, Cyclam, epsilon-Caprolactone polymerisation, ETHYLENE, HAFNIUM COMPLEXES, LIGANDS, macrocycles, OLEFIN POLYMERIZATION, polymerisation, Tetraazamacrocycles, TITANIUM COMPLEXES, ZIRCONIUM
Abstract

The reaction of H-2[1,8-dibenzyl-1,4,8,11-tetraazacyclotetradecanel (H(2)Bn(2)CYclam) with 2 equiv of LiBu gives Li(2)Bn(2)Cyclam(L)2 (L = Et2O or THF) that reacts with ZrCl4(THF)(2) to afford (Bn(2)Cyclam)ZrCl2 in 40% yield. Alternatively (Bn(2)Cyclam)ZrCl2 may be obtained via ZrCl2(CH2SiMe3)(2)(Et2O)(2) in a significantly higher yield (87%), avoiding the lithiation of H(2)Bn(2)Cyclam. The syntheses of other H-2*Bn(2)CYClaM ligand precursors (*Bn = 3,5-dimethylbenzyl and 3,5-di(tert-butyl)benzyl) and the corresponding Zr derivatives ({3,5-Me2Bn}(2)-Cyclam)ZrCl2 and ({3,5-(Bu2Bn)-Bu-t}(2)-Cyclam)ZrCl2 are also reported. Results on preliminary tests of E-caprolactone and ethylene polymerisation reactions are presented. (C) 2008 Elsevier B.V. All rights reserved.
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