A mild and efficient method for the synthesis of structurally diverse 1,2,3-triazolylidene palladium(II) diiodo complexes. Comparison of catalytic activities for Suzuki–Miyaura coupling
towards the selective formation of mononuclear [(Tz)2Pd(I)2] complexes, iodo bridged binuclear complexes [(Tz)Pd(I)(μ-I)2Pd(I)(Tz)], mononuclear PEPPSItypecomplexes [(Tz)Pd(I)2(Py)], bridged binuclear PEPPSItypecomplexes [(Tz)Pd(I)2-(bridge biPy)-(I)2Pd(Tz)]. The catalytic activities of these three structurally different types of complexes are compared for Suzuki–Miyaura coupling reaction.
Selective Anion Recognition by a Dynamic Quadruple Helicate
作者:Peter J. Steel、David A. McMorran
DOI:10.1002/asia.201801262
日期:2019.4.15
An M2L4 quadruplehelicate, formed by wrapping four molecules of 1,4‐bis(3‐pyridyloxy)benzene (L1) about two palladium(II) centers, is shown to bind anions within its internal cavity. 1H NMR exchange experiments provide a quantitative measure of anionselectivity and reveal a preference for ClO4− over the other tetrahedral anions BF4− and ReO4− and the octahedral anion PF6−. X‐ray crystal structures
The encapsulation of a PF6- ion within a quadruply stranded helicate (shown schematically) results from the self-assembly of four molecules of 1,4-bis(3-pyridyloxy)benzene and two PdII ions. This represents not only the first example of a coordinatively saturated quadruplehelicate, but also the first example of the encapsulation of a complex anion by a helicate.
Stability of [2]Pseudorotaxanes Templated Through Second-Sphere Coordination
作者:Barry A. Blight、James A. Wisner、Michael C. Jennings
DOI:10.1021/ic801725u
日期:2009.3.2
4-substituted pyridine co-ligand and the subsequent complexation strength in [2]pseudorotaxane formation. These trends also extended to trans-dibromobis(pyridine)palladium(II) (3a-e) and trans- dichlorobis(pyridine)platinum(II) complexes (5a-e) when plotted against σp° values. In addition, solid-state structures of three [2]pseudorotaxanes (1·2h, 1·2i, and 1·5e) were determined by single crystal X-ray
crystallography. The complexes were successfully employed in the Suzukicross-coupling of aryl bromides, Suzukicross-coupling of amides, Heckcross-coupling, and Sonogashira cross-coupling. Computational studies were employed to determine frontier molecular orbitals and bond order analysis of caffeine-derived Pd–PEPPSI complexes. This class of catalysts offers an entry to utilize benign and sustainable biomass-derived