Phthalazin-2-ylidenes As Cyclic Amino Aryl Carbene Ligands in Rhodium(I) and Iridium(I) Complexes

4 páginas, 6 figuras, 1 tabla, 2 esquemas.The direct metalation of phthalazinium halides with [Rh(tBuO)(COD)]2 or [Ir(tBuO)(COD)]2 led to the isolation of stable [MCl(phthalazin-2-ylidene)X(COD)] (M = Rh, Ir) as a new family of cyclic amino aryl carbene transition metal complexes. The X-ray diffraction analysis of several representatives systematically revealed a relatively short C(aryl)−C(carbene) bond distance of 1.44−1.46 Å, shorter than the typical C(sp2)−C(sp2) single bond, indicating some electron density delocalization from the π system of the aryl ring over the vacant carbene orbital.We thank the Spanish “Ministerio de Ciencia e Innovación” (grants CTQ2007-61915 and CTQ2007-60244), the European FEDER funds and the Junta de Andalucía (grants 2009/FQM-4537 and 2008/FQM-3833) for financial support.Peer reviewe