An improved synthesis of 4,4-bis(hydroxymethyl)-1,2-diselenolane and the complexation properties of the corresponding diselenolato dianion to group-10 metals are reported. We describe an efficient and straightforward procedure that bypasses the isolation of the malodorous and air-sensitive diselenol and starts with the diselenide and an appropriate group-10 metalcomplexbearingphosphane and chlorido
Insights into Formate Oxidation by a Series of Cobalt Piano-Stool Complexes Supported by Bis(phosphino)amine Ligands
作者:Andrew W. Cook、Thomas J. Emge、Kate M. Waldie
DOI:10.1021/acs.inorgchem.1c00563
日期:2021.5.17
accepting ability of these CoIII centers and to evaluate their reactivity toward the oxidation of formate. We find that the hydride accepting ability of 1–4 ranges from 71 to 74 kcal/mol in acetonitrile, which should favor a highly exergonic reaction with formate through direct hydride transfer. Formate oxidation was demonstrated at elevated temperatures in the presence of stoichiometric quantities
Ethylene Tetramerisation: A Structure‐Selectivity Correlation
作者:Boitumelo F. Makume、Cedric W. Holzapfel、Munaka C. Maumela、J. Alexander Willemse、Jan A. Berg
DOI:10.1002/cplu.202000553
日期:2020.10
The effect of ethylene tetramerisation ligand structures on 1‐octene selectivity is well studied. However, by‐product formation is less understood. In this work, a range of PNP ligand structures are correlated with the full product selectivity and with catalyst activity. As steric bulk on the N‐substituent increases, the product selectivity shifts from >10 % to < 3% of both C6 cyclics and C16+ by‐products
Studies of phosphorus–phosphorus nuclear-spin coupling in species with phosphorus–nitrogen bonds
作者:Ian J. Colquhoun、William McFarlane
DOI:10.1039/dt9770001674
日期:——
used to study 34 organophosphorus spacies with a P–N–P skeleton. The geminal 31P–31P coupling constant is large and positive in derivatives of three-co-ordinate phos-phorus and is increased by bulky or electronegative substituents on phosphorus. The results for several pairs of diastereoisomers, and also the temperature dependence, indicate a strong conformational dependence of the coupling which is
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。