Experimental Basicities of Superbasic Phosphonium Ylides and Phosphazenes
作者:Jaan Saame、Toomas Rodima、Sofja Tshepelevitsh、Agnes Kütt、Ivari Kaljurand、Tõiv Haljasorg、Ilmar A. Koppel、Ivo Leito
DOI:10.1021/acs.joc.6b00872
日期:2016.9.2
spanning more than 30 pKa units, has been compiled. Basicities of 47 compounds (around half of which are newly synthesized) are included. The solution basicity of the well-known t-Bu-N═P4(dma)9 phosphazene superbase is now rigorously linked to the scale. The compiled scale is a useful tool for further basicity studies in THF as well as in other solvents, in particular, in acetonitrile. A good correlation
的一些曾经测量(鏻叶立德)最强的超强碱的实验碱度被报告,并通过采用这些化合物,在THF超强碱的实验自洽碱度规模,达到AP ķ α(对的估计ķ一个的35)和跨过超过30 p K a单位,已被编译。包括47种化合物的碱性(其中大约一半是新合成的)。公知的溶液碱度吨-Bu-N = P 4(DMA)9磷腈超强碱现已与规模紧密相关。编制的量表是在THF以及其他溶剂(尤其是乙腈)中进一步进行碱度研究的有用工具。THF和乙腈中的碱度之间的良好相关性跨越了25个数量级,从而可以得到实验支持的乙腈中非常高的碱度(p K a > 40),而无法直接测量。提出了结构-基本趋势的分析。
[EN] MODIFIED HECK REACTION<br/>[FR] REACTION DE HECK MODIFIEE
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2005123662A1
公开(公告)日:2005-12-29
The present invention includes a method for the preparation of a cinnamonitrile by addition of an aryl to acrylonitrile in the presence of a heterogeneous palladium catalyst, a phosphine, a base and a salt. The reaction can be conducted not only on aryl compounds activated with electron withdrawing groups, but also on neutral and even on deactivated aryl compounds.
Highly Linear Selective Cobalt-Catalyzed Addition of Aryl Imines to Styrenes: Reversing Intrinsic Regioselectivity by Ligand Elaboration
作者:Wengang Xu、Naohiko Yoshikai
DOI:10.1002/anie.201408028
日期:2014.12.15
Highlylinearselective, imine‐directed hydroarylation of styrene has been achieved with cobalt‐based catalytic systems featuring bis(2,4‐dimethoxyphenyl)(phenyl)phosphine and either 2‐methoxypyridine or DBU as a ligand and a Lewis base additive, respectively, thus affording a variety of 1,2‐diarylethanes (bibenzyls) in good yields under mild reaction conditions. The triarylphosphine controls the regioselectivity
NOVEL PHOSPHINE-BASED CATALYSTS USEFUL FOR THE TELOMERIZATION OF BUTADIENE
申请人:Leeuwen Petrus Van
公开号:US20130123516A1
公开(公告)日:2013-05-16
A phosphine-based catalyst composition suitable for the telomerization of butadiene to produce 1-octene includes palladium and one of a class of novel phosphine ligands characterized by two potentially functionalized phenyl rings and a third phenyl group having an alkoxy functionality on one of the ortho-positions, which is part of a 5- or 6-membered ring between this ortho position and the adjacent meta position, this ring not being part of a second aryl group. The catalysts including this class of phosphine ligands may exhibit higher catalytic activity and selectivity, and may be used at lower temperatures, than many other phosphine ligand catalysts, reducing costs. Palladium precipitation may also be reduced.