摘要
Treatment of [Cr(μ-Cl)(Nacnac)] 2 (Nacnac = HC(C(Me)NC 6 H 3 -i-Pr 2 ) 2 ) with 2.5 equiv of KC 8 in toluene allows the isolation of an inverted-sandwich toluene-bridged complex, (μ-η 6 :η 6 -C 7 H 8 )[Cr(Nacnac)] 2 (1), in 88.2% yield as a dark-purple solid. The valency of each Cr is determined to be I by X-ray absorption spectroscopy. The twelve Cr-C distances are moderately long and 1 readily undergoes an arene exchange reaction with benzene. As a result, 1 behaves as a two-Cr(Nacnac) synthetic equivalents upon reaction with appropriate substrates. For example, treatment of 1 with 2 equiv of O 2 , 4 equiv of MesN 3 (Mes = 2,4,6-C 6 H 2 Me 3 ), and Ph 2 N 2 engenders the formation of a monomeric Cr(O) 2 (Nacnac) (2), Cr(NMes) 2 (Nacnac) (3), and (μ-NPh)(Nacnac)] 2 (4), respectively. Complex 1 is therefore an 8-electron reductant. Copyright © 2007 American Chemical Society.