forms a monoanion containing a putative carbene moiety. Oxidation of the anion with iodine leads to net hydride removal and yields the unusual C2-bridged dimers Tp‘(CO)2M⋮CC⋮W(CO)(PhC⋮CPh)Tp (M = Mo, 7; W, 8). Conversion of the tungsten−carbon single bond in the precursor complex to a triple bond in the product is accompanied by a significant reduction in donation to the metal from the alkyne π⊥ orbital
阴离子亚
乙烯基络合物 K[Tp'(CO)2MCCH2](M = Mo, W;Tp' = 氢化三(
3,5-二甲基吡唑基)
硼酸盐)与 Tp(CO)(PhC⋮CPh)W-I (Tp) 的反应= hydridotris(pyrazolyl)borate) 生成 Tp'(CO)2MCCH2−W(CO)(PhC⋮CPh)Tp (M = Mo, 4; W, 5) 和
碘化钾。用 KOBut 从 (⋮CCH2-) 桥上去除一个亚甲基质子,形成一个含有推定卡宾部分的单阴离子。用
碘氧化阴离子导致净
氢化物去除并产生不寻常的 C2 桥连二聚体 Tp'(CO)2M⋮CC⋮W(CO)(PhC⋮CPh)Tp (M = Mo, 7; W, 8)。前体复合物中的
钨-碳单键转化为产物中的三键伴随着从炔 π⊥ 轨道对
金属的捐赠显着减少。