Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 21st October 2020 from 07:00 AM to 07:00 PM (BST).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 28, 2007
Previous Article Next Article

Structural variation, dynamics, and catalytic application of palladium(ii) complexes of di-N-heterocyclic carbene–amine ligands

Author affiliations

Abstract

A series of palladium(II) complexes incorporating di-NHC–amine ligands has been prepared and their structural, dynamic and catalytic behaviour investigated. The complexes [trans-(κ2-tBuCN(Bn)CtBu)PdCl2] (12) and [trans-(κ2-MesCN(H)CMes)PdCl2] (13) do not exhibit interaction between the amine nitrogen and palladium atom respectively. NMR spectroscopy between −40 and 25 °C shows that the di-NHC–amine ligand is flexible expressing Cs symmetry and for 13 rotation of the mesityl groups is prevented. In the related C1 complex [(κ3-tBuCN(H)CtBu)PdCl][Cl] (14) coordination of NHC moieties and amine nitrogen atom is observed between −40 and 25 °C. Reaction between 12–14 and two equivalents of AgBF4 in acetonitrile gives the analogous complexes [trans-(κ2-tBuCN(Bn)CtBu)Pd(MeCN)2][BF4]2 (15), [trans-(κ2-MesCN(H)CMes)Pd(MeCN)2][BF4]2 (16) and [(κ3-tBuCN(H)CtBu)Pd(MeCN)][BF4]2 (17) indicating that ligand structure determines amine coordination. The single crystal X-ray structures of 12, 17 and two ligand imidazolium salt precursors tBuC(H)N(Bn)C(H)tBu][Cl]2 (2) and [tBuC(H)N(H)C(H)tBu][BPh4]2 (4) have been determined. Complexes 12–14 and 15–17 have been shown to be active precatalysts for Heck and hydroamination reactions respectively.

Graphical abstract: Structural variation, dynamics, and catalytic application of palladium(ii) complexes of di-N-heterocyclic carbene–amine ligands

Back to tab navigation

Supplementary files

Article information


Submitted
05 Mar 2007
Accepted
23 Apr 2007
First published
17 May 2007

Dalton Trans., 2007, 3065-3073
Article type
Paper

Structural variation, dynamics, and catalytic application of palladium(II) complexes of di-N-heterocyclic carbeneamine ligands

J. Houghton, G. Dyson, R. E. Douthwaite, A. C. Whitwood and B. M. Kariuki, Dalton Trans., 2007, 3065
DOI: 10.1039/B703248J

Social activity

Search articles by author

Spotlight

Advertisements