Organic Syntheses via Transition Metal Complexes. 109.¹ Transfer of Carbene Ligands from Group VI Metals to Rhodium as the Key Step of a Rhodium-Catalyzed Reactivity Enhancement of Fischer Carbene Complexes

Half-sandwich ruthenium(II) complexes of aminophosphines: synthesis, structures and catalytic applications in C–C coupling reactions between styrenes and diphenyldiazomethane

“…It is well known that many metal-mediated C Ã/C bond-forming reactions using diazo compounds proceed through a carbene intermediate [22,23]. The reactions follow the mechanism proposed earlier by Werner [24] and are shown in Scheme 6, which explains the formation of all products (cyclopropane, propene and Table 3 Selected bond distances (Å ) and bond angles (8) (1) …”

Catalytic Transmetalation from Group 6 Fischer Carbene Complexes: An Emerging Powerful Tool in Organic Synthesis

“…The exact nature of the catalytically active species is not known. Rh I species are good candidates because [(CO) 2 RhCl] 2 is active in this reaction and the system Rh III /MeOH is known to generate Rh I in the presence of suitable ligands 20 …”

Negishi Cross-Coupling Reaction as a Simple and Efficient Route to Functionalized Amino and Alkoxy Carbene Complexes of Chromium, Molybdenum, and Tungsten

“…Thermal and photochemical reactions of Fischer carbene complexes of chromium and tungsten have found a number of applications in the synthesis of complex organic molecules. Some of these reactions are moderated by other transition metals and involve transfer of a carbene ligand to the late transition metals, including copper, gold, nickel, ,, palladium , and rhodium. ,,,, Relatively little attention has been paid to the transition-metal-mediated modifications of already formed carbene complexes. For instance, ring-closing metathesis was used for the synthesis of complexes with attached carbocycles or heterocycles, and Fischer biscarbene complexes were prepared by oxidative cross-coupling and by click chemistry .…”