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...