一系列含有双(二芳基膦基)丙烷,双(二芳基膦基)乙烷,双(二芳基膦基)甲烷和N,N-双(二芳基膦基)胺配体的铜(I)配合物(芳基= Ph,2-C 6 H 4( Me)或2-C 6 H 4(i -Pr))已合成。报道了所选氯化物衍生物的晶体结构。事实证明,该复杂结构对螯合配体的主链和P-取代基都非常敏感。已经针对催化酰胺化反应筛选了配合物。尽管在大多数情况下仅观察到非常低的活性,与简单的卤化铜盐相比,值得注意的例外是基于N,N的催化剂-双(二苯基膦基)胺配体,其中观察到催化剂效率的显着改善。我们提出这些配体的不同寻常的电子性能可能是它们在先前已使用硬供体配体的这些和其他催化反应中表现出不同性能的原因。
Copper(I) Diphosphine Catalysts for C−N Bond Formation: Synthesis, Structure, and Ligand Effects
作者:Stephen Daly、Mairi F. Haddow、A. Guy Orpen、Giles T. A. Rolls、Duncan F. Wass、Richard L. Wingad
DOI:10.1021/om800139v
日期:2008.7.1
chelating ligand. The complexes have been screened for catalytic amidation reactions. Although in most cases only very low activity is observed, comparable with simple copper halide salts, notable exceptions are catalysts based on N,N-bis(diphenylphosphino)amine ligands, where a significant improvement in catalyst efficiency is observed. We propose the unusual electronic properties of these ligands may be
一系列含有双(二芳基膦基)丙烷,双(二芳基膦基)乙烷,双(二芳基膦基)甲烷和N,N-双(二芳基膦基)胺配体的铜(I)配合物(芳基= Ph,2-C 6 H 4( Me)或2-C 6 H 4(i -Pr))已合成。报道了所选氯化物衍生物的晶体结构。事实证明,该复杂结构对螯合配体的主链和P-取代基都非常敏感。已经针对催化酰胺化反应筛选了配合物。尽管在大多数情况下仅观察到非常低的活性,与简单的卤化铜盐相比,值得注意的例外是基于N,N的催化剂-双(二苯基膦基)胺配体,其中观察到催化剂效率的显着改善。我们提出这些配体的不同寻常的电子性能可能是它们在先前已使用硬供体配体的这些和其他催化反应中表现出不同性能的原因。
Rhodium-Catalyzed Branched-Selective Alkyne Hydroacylation: A Ligand-Controlled Regioselectivity Switch
作者:Carlos González-Rodríguez、Rebekah J. Pawley、Adrian B. Chaplin、Amber L. Thompson、Andrew S. Weller、Michael C. Willis
DOI:10.1002/anie.201100956
日期:2011.5.23
It's all in the ligand: By choice of the appropriate diphosphine ligand a previously linear‐selective alkynehydroacylation process can be “switched” to be highly branched‐selective (see scheme, l=linear, b=branched). Structural data for the ortho‐iPr‐dppe–rhodium catalyst suggest restricted rotation of the phosphine aryl units may be responsible for the observed selectivity.