Issue 2, 2010

Syntheses and structures of zirconium(iv) complexes supported by 2,6-di-adamantylaryloxide ligands and formation of arene-bridged dizirconium complexes with an inverse sandwich structure

Abstract

The reaction of 2,6-di-adamantyl-4-R-phenol (ArROH, R = Me, tBu) with nBuLi in THF gave good yields of the lithiated derivatives (ArRO)Li(THF)2. Addition of 2 equiv. of (ArRO)Li(THF)2 to ZrCl4(THF)2 in THF afforded the base-free dichloride complexes (ArRO)ZrCl2 (R = Me 1a, tBu 1b). The dibenzyl derivative (ArMeO)2Zr(CH2Ph)22 was synthesized by addition of 2 equiv. of PhCH2MgCl to 1a in toluene. Reduction of the dichloride complexes 1a and 1b with KC8 in toluene led to the formation of the toluene-bridged dizirconium complexes [(ArRO)2Zr]2(μ-η66-C7H8) (R = Me 3a, tBu 3b). A similar reaction was carried out in benzene to produce the corresponding benzene-bridged analogue [(ArRO)2Zr]2(μ-η66-C6H6) (R = Me 4a, tBu 4b). Treatment of 3a with 2 equiv. of 1-azidoadamantane (AdN3) in THF resulted in the release of toluene and N2, generating the monomeric imide complex (ArMeO)2Zr(NAd)(thf) 5. When the analogous reaction was carried out in toluene, (ArMeO)2Zr(AdNN[double bond, length as m-dash]NNAd) 6 was obtained. Structures of (ArRO)Li(THF)2, 1a, 2 and 5 were determined by X-ray crystallography.

Graphical abstract: Syntheses and structures of zirconium(iv) complexes supported by 2,6-di-adamantylaryloxide ligands and formation of arene-bridged dizirconium complexes with an inverse sandwich structure

Supplementary files

Article information

Article type
Paper
Submitted
05 Jun 2009
Accepted
14 Aug 2009
First published
02 Sep 2009

Dalton Trans., 2010,39, 484-491

Syntheses and structures of zirconium(IV) complexes supported by 2,6-di-adamantylaryloxide ligands and formation of arene-bridged dizirconium complexes with an inverse sandwich structure

T. Watanabe, Y. Ishida, T. Matsuo and H. Kawaguchi, Dalton Trans., 2010, 39, 484 DOI: 10.1039/B911082H

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