Faculté des sciences
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Square-Planar Diacetatopalladium Complexes with trans-Configured Secondary Amine Ligands that Avoid Orthometalation: Ligand Synthesis, Coordination, Molecular Structure and Catalytic Potential for Suzuki Cross-Coupling Reactions

Chahen, Ludovic ; Therrien, Bruno ; Süss-Fink, Georg

In: European Journal of Inorganic Chemistry, 2007, vol. 32, p. 5045-5051

The trans-configured square-planar palladium complexes [Pd(OAc)2 (LNtBu)2] (1), [Pd(OAc)2 (η2-LN∩NtBu)] (2), [Pd(OAc)2 (LNPh)2] (3), and [Pd(OAc)2 (η2-LN∩NPh)] (4), have been synthesized by treating palladium acetate with the amines... More

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    Title
    • Square-Planar Diacetatopalladium Complexes with trans-Configured Secondary Amine Ligands that Avoid Orthometalation: Ligand Synthesis, Coordination, Molecular Structure and Catalytic Potential for Suzuki Cross-Coupling Reactions
    Author
    • Chahen, Ludovic. Institut de Chimie, Université de Neuchâtel, Switzerland
    • Therrien, Bruno. Institut de Chimie, Université de Neuchâtel, Switzerland
    • Süss-Fink, Georg. Institut de Chimie, Université de Neuchâtel, Switzerland
    Document Type
    • Postprint
    Publication Date
    • 2007
    OAI-PMH Identifier
    • oai:doc.rero.ch:20090327162815-PL
    Submission No.
    • 20090327162815-PL
    Summary
    The trans-configured square-planar palladium complexes [Pd(OAc)2 (LNtBu)2] (1), [Pd(OAc)2 (η2-LN∩NtBu)] (2), [Pd(OAc)2 (LNPh)2] (3), and [Pd(OAc)2 (η2-LN∩NPh)] (4), have been synthesized by treating palladium acetate with the amines NHtBuCH2-2,4,6-Me3C6H2 (LNtBu) or NHPhCH2-2,4,6-Me3C6H2 (LNPh) or with the diamines NHtBuCH2-2,4,6-Me3C6H-CH2-2,4,6-Me3C6H-CH2-NHtBu (LN∩NtBu) or NHPh-CH2-2,4,6-Me3C6H-CH2-2,4,6-Me3C6H-CH2-NHPh (LN∩NPh). The single-crystal X-ray structure analysis of complexes 1-3 confirms a trans arrangement of the two acetato groups and of the two nitrogen atoms. Orthometalation leading to palladacycles is impossible in all cases as the ortho positions in the benzylic rings are blocked by methyl substituents. All complexes are found to catalyze Suzuki cross-coupling reactions of deactivated and even sterically hindered arene substrates.