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