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Molecules 2014, 19(8), 11988-11998;

Synthesis, Immobilization and Catalytic Activity of a Copper(II) Complex with a Chiral Bis(oxazoline)

Department of Chemistry, CICECO, University of Aveiro, Aveiro 3810-193, Portugal
Departamento de Física de Polímeros, Elastámeros y Applicaciones Energéticas, Instituto de Ciencia e Tecnología de Polímeros, CSIC, Madrid 28006, Spain
Green Chemistry Centre of Excellence, Department of Chemistry, University of York, York YO10 5DD, UK
Author to whom correspondence should be addressed.
Received: 13 July 2014 / Revised: 30 July 2014 / Accepted: 30 July 2014 / Published: 11 August 2014
(This article belongs to the Special Issue Practical Applications of Metal Complexes)
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A chiral bis(oxazoline) bearing CH2OH groups was synthesized from a commercial bis(oxazoline) and characterized by 1H- and 13C-NMR, high resolution ESI-mass spectrometry and FTIR. The corresponding copper(II) complex was immobilized onto the surface of a mesoporous carbonaceous material (Starbon® 700) in which the double bonds had been activated via conventional bromination. The materials were characterized by elemental analysis, ICP-OES, XPS, thermogravimetry and nitrogen adsorption at 77 K. The new copper(II) bis(oxazoline) was tested both in the homogeneous phase and once immobilized onto a carbonaceous support for the kinetic resolution of hydrobenzoin. Both were active, enantioselective and selective in the mono-benzoylation of hydrobenzoin, but better enantioselectivities were obtained in the homogeneous phase. The heterogeneous catalyst could be separated from the reaction media at the end of the reaction and reused in another catalytic cycle, but with loss of product yield and enantioselectivity. View Full-Text
Keywords: copper(II); bis(oxazoline); homogeneous catalysis; heterogeneous catalysis; asymmetric catalysis copper(II); bis(oxazoline); homogeneous catalysis; heterogeneous catalysis; asymmetric catalysis

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Carneiro, L.; Silva, A.R.; Shuttleworth, P.S.; Budarin, V.; Clark, J.H. Synthesis, Immobilization and Catalytic Activity of a Copper(II) Complex with a Chiral Bis(oxazoline). Molecules 2014, 19, 11988-11998.

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