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Université de Fribourg

Chelating C4-bound imidazolylidene complexes through oxidative addition of imidazolium salts to palladium(0)

Krüger, Anneke ; Kluser, Evelyne ; Müller-Bunz, Helge ; Neels, Antonia ; Albrecht, Martin

In: European Journal of Inorganic Chemistry, 2012, p. -

Oxidative addition of donor-functionalised 4-iodoimidazolium salts to palladium(0) provides a selective route for the preparation of abnormal chelating N-heterocyclic carbene complexes and enables the introduction of a variety of donor groups. The activation of the C4 position does not necessitate protection of the imidazolium C2 position, thereby leaving this site available for further...

Université de Fribourg

Normal and abnormal carbene complexes derived from thiazole: Preparation and a preliminary investigation of their relative catalytic performance

Stander-Grobler, Elzet ; Schuster, Oliver ; Strasser, Christoph E. ; Albrecht, Martin ; Cronje, Stephanie ; Raubenheimer, Helgard G.

In: Polyhedron, 2011, vol. 30, no. 17, p. 2776-2782

Readily prepared 2-, 4- and 5-bromo-3-methyl thiazolium triflates react by oxidative substitution with M(PPh₃)₄ (M = Ni or Pd) to furnish five of the expected normal and abnormal cationic thiazolylidene complexes (1a, 1b, 2a, 2b, and 3b). Carbene complex formation is accompanied by a ca. 40 ppm downfield shift of the α-N carbene carbons in Pd...

Université de Neuchâtel

Synthesis and structural characterization of binuclear palladium(II) complexes of salicylaldimine dithiosemicarbazones

Stringer, Tameryn ; Chellan, Prinessa ; Therrien, Bruno ; Shunmoogam-Gounden, Nelusha ; Hendricks, Denver T. ; Smith, Gregory S.

In: Polyhedron, 2009, vol. 28, no. 14, p. 2839-2846

A series of binuclear palladium(II) salicylaldiminato dithiosemicarbazone complexes have been synthesized and characterized. The palladium complexes were obtained by the reaction of various ethylene- and phenylene-bridged dithiosemicarbazones with Pd(PPh3)2Cl2. The free salicylaldimine ligands and their palladium complexes were characterized by NMR and IR...

Université de Neuchâtel

Synthesis and structural analysis of palladium biscarbene complexes derived from bisimidazolium ligand precursors

Heckenroth, Marion ; Neels, Antonia ; Stoeckli-Evans, Helen ; Albrecht, Martin

In: Inorganica Chimica Acta, 2006, vol. 359, no. 6, p. 316-330

The palladation of potentially chelating bisimidazolium ligand precursors with palladium acetate gives bridging bimetallic, chelating monometallic, and homoleptic tetracarbene complexes. The coordination mode of the biscarbene ligand has been identified by spectroscopic analysis and crystallographic characterization of representative complexes, including the first example of a biscarbene A-frame...

Université de Neuchâtel

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...

Université de Neuchâtel

Complexes plan-carrés de palladium à configuration “trans” : nouveaux ligands, coordination et potentiel catalytique pour le couplage de Suzuki

Chahen, Ludovic ; Süss-Fink, georg (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2007 ; Th. 1953.

La réaction de couplage carbone-carbone de Suzuki représente une des meilleures voies de synthèse des composés biaryles. Ces composés constituent des blocs de construction fondamentaux en synthèse organique, et leur préparation représente un défi important pour les industriels. Le mécanisme de la réaction de Suzuki a fait l’objet de nombreuses recherches et il reste encore...

Université de Neuchâtel

1,2-Bis-N-[2’-(diphenylphosphanyl)benzoyl]diaminobenzene, a New Chelating Ligand with Versatile Coordination Properties

Burger, Sylvain ; Therrien, Bruno ; Süss-Fink, Georg

In: European Journal of Inorganic Chemistry, 2003, vol. 17, p. 3099 - 3103

1,2-Bis-N-[2’-(diphenylphosphanyl)benzoyl]diaminobenzene (dppbH; 1) was prepared by peptidic coupling and shown to exist, in the solid state, in the form of hydrogen-bonded dimers by single-crystal X-ray structure analysis. As expected, 1 reacts with [MCl2 (cod)] (M = Pd, Pt; cod = cyclooctadiene) to form square-planar complexes. However, in the case of palladium...