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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...