Enhanced Catalytic Activity of Iridium(III) Complexes by Facile Modification of C,N-Bidentate Chelating Pyridylideneamide Ligands
作者:Miquel Navarro、Christene A. Smith、Martin Albrecht
DOI:10.1021/acs.inorgchem.7b01654
日期:2017.10.2
phenylacetylene. Moreover, these PYA iridium complexes catalyze the base-free transfer hydrogenation of aldehydes, and to a lesser extent also of ketones. Under standard transfer hydrogenation conditions including base, aldehydes are rapidly oxidized to carboxylic acids rather than reduced to the corresponding alcohol, as is observed under base-free conditions.
在五甲基环戊二烯基(Cp *)铱中心,将一组由于明显的两性离子和中性二烯型共振结构而具有可变的给体性质的芳基取代的吡啶基亚酰胺(PYA)配体用作电子柔性配体。这种类型的配体的直接合成使得可以容易地在C,N-二齿螯合PYA的苯环的不同位置引入供体取代基,例如甲氧基。这些修饰大大增强了配位铱中心对羰基和亚胺的需氧转移催化氢化以及苯乙炔的氢化硅烷化的催化活性。而且,这些PYA铱络合物催化醛的无碱转移氢化,并且在较小程度上也催化酮。