Synthesis and Catalytic Applications of Stable Palladium Dioxygen Complexes
作者:Alexey G. Sergeev、Helfried Neumann、Anke Spannenberg、Matthias Beller
DOI:10.1021/om1003418
日期:2010.8.9
The synthesis and characterization of air-stable palladium dioxygen complexes Pd(O2)L2 of basic phosphines L = P(1-Ad)2nBu, PtBu2nBu is described. Contrary to general belief, these dioxygen complexes are stable catalyst precursors for palladium-catalyzed coupling reactions. Specifically, palladium-catalyzed formylations and alkoxy carbonylations of aryl bromides proceed in high yield in air using commercial
描述了碱性膦L = P(1-Ad)2 n Bu,P t Bu 2 n Bu的空气稳定的钯二氧配合物Pd(O 2)L 2的合成和表征。与一般的看法相反,这些双氧配合物是钯催化的偶联反应的稳定催化剂前体。具体地,使用市售的非脱气溶剂,在空气中高产率地进行芳族溴化物的钯催化的甲酰化和烷氧基羰基化。结果表明,在CO或H 2的还原气氛中,Pd(O 2)L 2络合物被还原成催化活性的钯(0)物种。 在羰基化反应开始时。
Synthesis and Crystal Structure of Palladium(0) and Arylpalladium(II) Bromide Complexes of Cata<i>CX</i>ium A
作者:Alexey G. Sergeev、Alexander Zapf、Anke Spannenberg、Matthias Beller
DOI:10.1021/om700889b
日期:2008.1.1
Diphosphine palladium(0) (1) and arylpalladium(II) bromide complexes (2a-d) of di-1-adamantyl-n-butylphosphine (CataCXium A) have been synthesized. The PdL2 complex 1 takes a remarkable eclipsed conformation of the substituents along the P-Pd-P direction. NMR and X-ray studies of 2a showed its dimeric structure with the n-butyl groups of the coordinated phosphine ligands lying nearly parallel to the planes of the aromatic rings, which results in an anomalous H-1 NMR upfield shift of the n-butyl protons caused by the aromatic ring current effect.