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Issue 2, 2014
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Ligand spheres in asymmetric hetero Diels–Alder reactions catalyzed by Cu(II) box complexes: experiment and modeling

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Abstract

The stereoselective hetero Diels–Alder reaction between ethyl glyoxylate and cyclohexadiene catalyzed by [Cu(II)t-Bu-(box)](OTf)2 was investigated. The reaction was performed step-by-step and the geometry of the Cu(II) complexes formed in the course of the catalysis was analysed by EPR spectroscopy, advanced pulsed EPR methods (ENDOR, and HYSCORE) and DFT calculations. Our results show that one triflate counterion is directly coordinated to Cu(II) during the catalytic process (axial position). This leads to penta-coordinated Cu(II) complexes. Solvent molecules are able to alter the geometry of the Cu(II) complexes although their coordination is weak. These findings provide an explanation for the solvent and counterion effects observed in many catalytic reactions.

Graphical abstract: Ligand spheres in asymmetric hetero Diels–Alder reactions catalyzed by Cu(ii) box complexes: experiment and modeling

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Publication details

The article was received on 17 Jun 2013, accepted on 13 Sep 2013 and first published on 13 Sep 2013


Article type: Paper
DOI: 10.1039/C3DT51602D
Citation: Dalton Trans., 2014,43, 698-705
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    Ligand spheres in asymmetric hetero Diels–Alder reactions catalyzed by Cu(II) box complexes: experiment and modeling

    V. Umamaheswari, P. Cias, A. Pöppl, M. Kaupp and G. Gescheidt, Dalton Trans., 2014, 43, 698
    DOI: 10.1039/C3DT51602D

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