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Copper(II) complexes of pyridine-oxazoline (Pyox) ligands: coordination chemistry, ligand stability, and catalysis

By Andrew J. Hallett, Thomas O'Brien, Emma Carter, Benson Kariuki, Damien Martin Murphy and Benjamin David Ward

Abstract

The coordination chemistry of copper(II) complexes bearing pyridine-oxazoline (“Pyox”) ligands has been studied, with an aim of investigating their catalytic ability. Interestingly, the stability of the coordinated ligands has been shown to be much less than previously assumed: hydrolysis of the ligands by fortuitous water gives rise to 2-pyridine carboxylate formation, which encapsulate the copper in a two-dimensional coordination polymer 3. The complexes [Cu(R-Pyox)(NCMe)2(ClO4)2] {R = benzyl (Bn) 2a, phenyl (Ph) 2b, isopropyl (iPr) 2c} have been prepared, of which the benzyl derivative has been analysed by CW EPR spectroscopy. The complex [Cu(Bn-Pyox)(NCMe)2(ClO4)2] and the afore-mentioned coordination polymer have been crystallographically characterised. The performance of complexes 2a–c in the asymmetric allylic oxidation of cyclohexene is describe

Topics: QD Chemistry
Publisher: Elsevier
Year: 2016
DOI identifier: 10.1016/j.ica.2015.10.032
OAI identifier: oai:http://orca.cf.ac.uk:83327
Provided by: ORCA
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