具有多种功能的分级介孔聚合物的合成是具有挑战性的。在此,我们报告了在温和条件下基于重氮偶合反应在水性溶液中合成具有分级多孔结构的酚类偶氮聚合物的无模板策略。所得聚合物的表面积最大为593 m 2 g -1,中孔比率> 80%,并且具有与金属离子(例如Cu 2 +,Zn 2 +,Ni 2+)络合的良好能力,从而获得了金属负载量高达26.24 wt%。此外,与Zn络合的聚合物表现出优异的催化CO 2与环氧化物反应的性能,TOF为2570 h -1在四丁基溴化铵(7.2摩尔%)的存在下。与铜配合的聚合物可以高效地催化醇的氧化。
transfer hydrogenation and borrowinghydrogen reactions paved the way to manipulate simple alcohols in previously unthinkable manners and circumvented the need for hydrogen gas. Analogously, transfer hydrocarbylation could greatly increase the versatility of tertiary alcohols. However, this reaction remains unexplored because of the challenges associated with the catalytic cleavage of unactivated C–C bonds
One-Pot Synthesis of Diarylmethanones through Palladium-Catalyzed Sequential Coupling and Aerobic Oxidation of Aryl Bromides with Acetophenone as a Latent Carbonyl Donor
作者:Xing Wang、Fu-Di Liu、Hai-Yang Tu、Ai-Dong Zhang
DOI:10.1021/jo5010185
日期:2014.7.18
A one-pot palladium-catalyzedsynthesis of symmetrical and unsymmetrical diarylmethanones using acetophenone and aryl bromides as raw materials has been developed. In this reaction, acetophenone acts as a latent carbonyl donor and two pathways of palladium-catalyzed sequential coupling and aerobic oxidation are identified. The reaction is applicable to a spectrum of substrates and delivers the products
Towards High-Performance Lewis Acid Organocatalysis
作者:Lars Ratjen、Manuel van Gemmeren、Fabio Pesciaioli、Benjamin List
DOI:10.1002/anie.201402765
日期:2014.8.11
The combination of Lewisacidorganocatalysis and internal hydrogen‐bond assistance was used to develop a new type of highly active disulfonimide catalyst. The increased Lewis acidity was documented by activity comparisons as well as theoretical investigations. Finally, the potential of the hydrogen‐bond‐assisted disulfonimide catalyst was demonstrated by its application in an enantioselective transformation
Insertions of Ketones and Nitriles into Organorhodium(I) Complexes and β-Hydrocarbyl Eliminations from Rhodium(I) Alkoxo and Iminyl Complexes
作者:Pinjing Zhao、John F. Hartwig
DOI:10.1021/om800378v
日期:2008.9.22
electron-poor aryl group. Independent preparation of 3f−g and studies on their thermal decomposition with added PEt3 confirmed that selective β-aryl elimination occurs to generate aryl complex 1g and the corresponding ketones. Analogous β-aryl eliminations from bis-phosphine rhodium(I) alkoxo complexes 3a−e and trisphosphine rhodium(I) alkoxo complexes 4b−e were also studied, and the kinetic results were most
制备了一系列的三(三乙基膦)-连接的有机铑(I)配合物,并研究了它们与电子贫芳基腈和二芳基酮的反应。[(PEt 3)3 Rh(Ar)](Ar =苯基(1a)或邻-茴香基(1e))与过量的电子贫芳基Ar'C≡N(Ar'= p -CF 3 C 6 H 4或3,5-bis(CF 3)C 6 H 3)形成Rh(I)亚氨基络合物(PEt 3)3 Rh [N═C(Ar)(Ar')]}(2h - j) 。相反,3,5-bis(CF 3)C 6 H 3 CN没有插入芳基铑(I)配合物[(PEt 3)3 Rh(Ar)](Ar = p -CF 3 C 6 H 4(1f)或3, 5-双(CF 3)C 6 H 3(1g)),含有更多的贫电子芳基。腈插入的动力学数据与涉及初始配体解离,随后经典的迁移插入的途径最一致。亚胺基络合物2i - j在较高温度下通过β-芳基消除而分解,同时电子侧差的芳基3,5-双(CF 3)C
Catalysts, ligands and use thereof
申请人:Fletcher Stephen Patrick
公开号:US09636670B2
公开(公告)日:2017-05-02
According to the present invention, there is provided a catalytic complex comprising a metal, one or more ligands and one or more counterions, wherein said one or more ligands include a non-racemic chiral ligand and wherein said one or more counterions include a triflimide counterion. Also provided are methods of making said catalytic complex and processes for producing chiral compounds which involve the use of said catalytic complex. In addition, the present invention provides compounds of the formula (2) as defined herein. The compounds of formula (2) may be useful as ligands in catalytic complexes.