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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
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

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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