1. trans-Disubstituted diamido/diamine cyclam zirconium complexes
- Author
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UCL - SC/CHIM - Département de chimie, Munha, Rui F., Alves, Luis G., Maulide, Nuno, Duarte, M. Teresa, Marko, Istvan, Fryzuk, Michael D., Martins, Ana M., UCL - SC/CHIM - Département de chimie, Munha, Rui F., Alves, Luis G., Maulide, Nuno, Duarte, M. Teresa, Marko, Istvan, Fryzuk, Michael D., and Martins, Ana M.
- 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.
- Published
- 2008