Unprecedented Rhodium-Mediated Trimerization of Alkynes HC⋮CR (R = Ph, <i>p</i>-Tolyl) Leading to (η<sup>4</sup>-Cyclobutadiene)rhodium Complexes
作者:María Pilar Lamata、Emilio San José、Daniel Carmona、Fernando J. Lahoz、Reinaldo Atencio、Luis A. Oro
DOI:10.1021/om960318t
日期:1996.10.29
[(η5-C5Me5)Rh(l-alaninate)Cl] (1) reacts with HC⋮CR (R = Ph, p-tolyl), in methanol, in the presence of NEt3, to form the new cyclobutadiene compounds [(η5-C5Me5)Rh(η4-C4HR2C⋮CR)] (R = Ph (2a), p-tolyl (2b)) as the major products. The X-raymolecularstructuredetermination of complex 2a has been carried out. The complex exhibits a sandwichlike structure with the rhodium metal located between a η4-phenylethynyl
Half-sandwich organometallic complexes with stereogenic metal centres: Synthesis and characterization of diastereomeric [(ηn-ring)M(Aa)X] (Aa = α-amino carboxylate) compounds
作者:Daniel Carmona、M. Pilar Lamata、Fernando Viguri、Emilio San José、Ana Mendoza、Fernando J. Lahoz、Pilar García-Orduña、Reinaldo Atencio、Luis A. Oro
DOI:10.1016/j.jorganchem.2012.07.022
日期:2012.10
epimers at metal of the α-amino carboxylate compounds [(ηn-ring)M(Aa)Cl] [(ηn-ring)M = (η5-C5Me5)Rh(III), (η5-C5Me5)Ir(III), (η6-p-MeC6H4iPr)Ru(II); Aa = α-amino carboxylate] can be readily prepared from the corresponding acetylacetonate compounds [(ηn-ring)M(acac)Cl]. In general, even below 0 °C, these complexes epimerise at the metal. The absoluteconfiguration at the metal has been determined by X-ray