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. 2004 Jan 21;126(2):470-1.
doi: 10.1021/ja038817q.

New Fischer carbene complexes of rhodium(i): preparation and 2-cyclopentenone ring synthesis by annelation to alkynes

José Barluenga  1 , Rubén Vicente, Luis A López, Eduardo Rubio, Miguel Tomás, Carmen Alvarez-Rúa
Affiliations

New Fischer carbene complexes of rhodium(i): preparation and 2-cyclopentenone ring synthesis by annelation to alkynes

José Barluenga et al. J Am Chem Soc. .

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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