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New Fischer Carbene Complexes of Rhodium(I):  Preparation and 2-Cyclopentenone Ring Synthesis by Annelation to Alkynes

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posted on 2004-01-21, 00:00 authored by José Barluenga, Rubén Vicente, Luis A. López, Eduardo Rubio, Miguel Tomás, Carmen Álvarez-Rúa
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.