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Issue 14, 2011
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Novel bis(azole) pincer palladium complexes: synthesis, structures and applications in Mizoroki–Heck reactions

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Abstract

Two novel NCN-pincer complex precursors bearing frameworks of 2,6-bis(oxazol-4-yl)benzene (A) and 2-(thiazol-4-yl)-6-(oxazol-4-yl)benzene (B) were synthesized. Palladations of A and B afforded two new bis(azole) pincer complexes, [(A3NCN)PdBr] (1) and [(B3NCN)PdBr] (2). Both complexes were fully characterized by NMR, MS, DSC-TGA and single-crystal X-ray diffraction analysis. Complex 1 crystallizes in a noncentrosymmetric orthorhombic space group Cmc21 (No. 36, Z = 4). Complex 2 crystallizes in a centrosymmetric monoclinic space groupP21/n (No. 14, Z = 4). Despite the similarity in their chemical formulas, the structures of the two complexes are subtly different: they are built up of two-dimensional supramolecular layers with identical topology, but stacked in different sequences, i.e., the layers in complex 1 are stacked in an AAAA-type fashion, while those in complex 2 are stacked in an alternating AA−1AA−1 sequence (A denotes a layer; A−1 stands for A's inversion symmetry equivalent). In addition, the complexes showed good catalytic activity toward Mizoroki–Heck reactions.

Graphical abstract: Novel bis(azole) pincer palladium complexes: synthesis, structures and applications in Mizoroki–Heck reactions

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Publication details

The article was received on 19 Oct 2010, accepted on 26 Jan 2011 and first published on 03 Mar 2011


Article type: Paper
DOI: 10.1039/C0DT01414A
Citation: Dalton Trans., 2011,40, 3601-3609
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    Novel bis(azole) pincer palladium complexes: synthesis, structures and applications in Mizoroki–Heck reactions

    Q. Luo, J. Tan, Z. Li, Y. Qin, L. Ma and D. Xiao, Dalton Trans., 2011, 40, 3601
    DOI: 10.1039/C0DT01414A

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