for the reduction of PhCHO under water-gas shift conditions; 4a exhibits higher activity than 4b/4b′. Control experiments with monometallic species establish the cooperativity between a bifunctional iron fragment and a copper fragment during the catalytic reaction. A mechanistic investigation including stoichiometric reactions, various control experiments, and labeling studies has led to the proposal
两
铁铜双核配合物已经从(
环戊二烯酮)
铁配合物的反应合成2,5-(
EME 3)2 -3,4-(CH 2)4(η 4 -C 4 C = O)} Fe(CO)3(E = Si,1a ; E = C,1b)与(IPr)CuOH(IPr = 1,3-双(
二异丙基苯基)
咪唑-2-亚烷基)。X-射线结晶研究表明,这些配合物通过设有可以由下式描述的桥接
氢化物的结构2,5-(
EME 3)2 -3,4-(CH 2)4(η 4 -C 4 Ç ═O)}(CO)2Fe(μ-H)Cu(IPr)(E = Si,4a '; E = C,4b ')。当它们溶解在
甲苯,THF或
环己烷中时,这些络合物形成4a '或4b '与末端氢化
铁2,5-(
EMe 3)2 -3,4-(CH 2)的快速平衡的异构体混合物4(η 5 -C 4 COCuIPr)}的Fe(CO)2 H(E =
硅,4A ; E = C,图4b)。Me 3 Si