已经测量了从广泛的路易斯碱硼烷加合物中置换 BH 3的奎宁环动力学。这些速率的参数化使得能够开发出离核量表 (NF B ),以量化和预测一系列其他路易斯碱基的离去基团能力。在多个系列 R' 3– n R n X (X = P, N; R' = 芳基, 烷基) 中观察到的可加性允许制定相关的取代基参数 ( n f PB , n f AB ),提供了一种方法计算N F B一系列路易斯碱基的值远远超出了实验得出的值。通过取代基参数n f PB与一系列烷基和芳基 MIDA 硼酸盐在中性条件下的水解速率的相关性,探索了核离性参数的效用。这允许鉴定具有接近反应中心的杂原子的 MIDA 硼酸盐,显示出不寻常的动力学不稳定性或水解稳定性。
The effects of phosphorus substituents on the reactivity of α‐alkoxyphosphonium salts with nucleophiles has been explored. Reactions of α‐alkoxyphosphonium salts, prepared from various acetals and tris(o‐tolyl)phosphine, with a variety of nucleophiles proceeded efficiently. These processes represent the first examples of high‐yielding nucleophilic substitution reactions of α‐alkoxyphosphonium salts
Optically active transition-metal complexes VII Iron and ruthenium complexes with the optically active cyclopentadienyl ligand PCp: syntheses and ligand exchange reactions
作者:Bernhard Pfister、Ruedi Stauber、Albrecht Salzer
DOI:10.1016/s0022-328x(96)06849-0
日期:1997.4
The opticallyactivecomplexes [PCpFe(CO)2]2 and [PCpRu(CO)2]2 (PCp = pinene-fused cyclopentadiene) have been converted into half-sandwich complexes PCpM(CO)2X (XCl, Br, I, CH3, COMe, COPh, COMes) by either oxidative or reductive methods. Ligand exchange of one of the diastereotopic carbonyl ligands for a Lewis base L L = tertiary phosphine or phosphite) generates diastereomeric complexes PCpML(CO)X
Five-coordinate Bis(1,1,1,5,5,5-hexafluoro-2,4-pentanedionato)(tertiary phosphine)palladium(II) and -platinum(II) Complexes. X-Ray Crystal and Molecular Structures and Fluxional Motions in Solution
and structures of [Pd(hfac)2P(o-tolyl)3}] and [Pt(hfac)2P(cyclohexyl)3}] were determined by X-ray analysis. Both complexes have very distorted square-pyramidal structures, one of the two hfac anions in either of them spanning the apical and basal coordination sites. NMR spectra at various temperatures disclosed the fluxional behaviors of these complexes which retain the solid-state structures at such
BIS(6-METHYL-3-SULPHOPHENYL)PHENYLPHOSPHINE, AMMONIUM SALT THEREOF, AND METHOD FOR PRODUCING SAME
申请人:HOKKO CHEMICAL INDUSTRY CO., LTD.
公开号:US20160052947A1
公开(公告)日:2016-02-25
Provided are a water-soluble triarylphosphine for a palladium catalyst, which has high selectivity in a telomerization reaction and can be recovered with efficiency, an ammonium salt thereof, and a method for efficiently producing the same. Specifically, provided are bis(6-methyl-3-sulphophenyl)phenylphosphine; a bis(6-methyl-3-sulphonatophenyl)phenylphosphine diammonium salt obtained by reacting the phosphine with a tertiary amine having a total of 3 to 27 carbon atoms in groups bonded to one nitrogen atom; and a method for producing the same.
Biphasic Aqueous Organometallic Catalysis Promoted by Cyclodextrins: How to Design the Water-Soluble Phenylphosphane to Avoid Interaction with Cyclodextrin
generated by the methyl groups on the CD secondary face. The absence or presence of an interaction between phosphanes and methylated β-CD was also confirmed by catalytic experiments. Thus, the phosphanes that do not interact with the methylated CD were the most efficient mass-transfer promoters in an aqueousbiphasic palladium-catalyzed Tsuji–Trost reaction.