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DOI: 10.1055/s-2007-985577
N-Heterocyclic Carbene-Copper(I) Complexes in Homogeneous Catalysis
Publication History
Publication Date:
13 August 2007 (online)
Abstract
N-Heterocyclic carbenes (NHCs) have become increasingly popular as ligands for transition metals, thanks to their remarkable successes in metathesis and cross-coupling areas. Important advances have also been achieved in organocopper chemistry. To date, the reported neutral N-heterocyclic carbene-copper(I) complexes have shown outstanding catalytic activity. In this account, we describe the application of such complexes in a variety of organic transformations.
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1 Introduction
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2 Copper-Hydride-Mediated Reactions
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2.1 Reduction of Carbonyl Compounds
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2.1.1 Activity and Scope
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2.1.2 Mechanistic Considerations
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2.2 Related Transformations
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3 Carbene Transfer Reactions
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3.1 Cyclopropanation and Insertion Reactions
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3.2 Olefination Reactions
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4 [3+2] Cycloaddition of Azides and Alkynes
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4.1 ‘Click Chemistry’
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4.2 Use of Internal Alkynes: Mechanistic Implications
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5 Miscellaneous Reactions
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6 Concluding Remarks
Key words
N-heterocyclic carbene - copper - diazo compounds - homogeneous catalysis - hydrosilylation
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References
Formation of the homocoupling byproduct had occurred with the previously reported copper(I) complexes, see ref. 32.
43As representative examples, the formation of the products given in Table [4] , entries 1 and 4, was not observed when the reaction was carried out in the presence of copper(I) chloride instead of [(IPr)CuCl].
59[(IPr)CuCl] is now commercially available from Strem.