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  • Title: New Fischer carbene complexes of rhodium(i): preparation and 2-cyclopentenone ring synthesis by annelation to alkynes.
    Author: Barluenga J, Vicente R, López LA, Rubio E, Tomás M, Alvarez-Rúa C.
    Journal: J Am Chem Soc; 2004 Jan 21; 126(2):470-1. PubMed ID: 14719936.
    Abstract:
    A new type of metal carbene complexes of group 9, specifically a cationic Fischer carbene of rhodium(I), has been synthesized from chromium carbene complexes via double transfer of carbene and CO ligands. These complexes reveal a different reactivity than other transition metal carbenes, including their chromium precursors, toward neutral and electron-poor alkynes, giving selectively polysubstituted cyclopentenones.
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