Tri(1-adamantyl)phosphine: Expanding the Boundary of Electron-Releasing Character Available to Organophosphorus Compounds
作者:Liye Chen、Peng Ren、Brad P. Carrow
DOI:10.1021/jacs.6b03215
日期:2016.5.25
We report here the remarkable properties of PAd3, a crystalline air-stable solid accessible through a scalable SN1 reaction. Spectroscopic data reveal that PAd3, benefiting from the polarizability inherent to large hydrocarbyl groups, exhibits unexpected electron releasing character that exceeds other alkylphosphines and falls within a range dominated by N-heterocyclic carbenes. Dramatic effects in
[EN] TRI-(ADAMANTYL)PHOSPHINES AND APPLICATIONS THEREOF<br/>[FR] TRI-(ADAMANTYL)PHOSPHINES ET LEURS APPLICATIONS
申请人:UNIV PRINCETON
公开号:WO2017075581A1
公开(公告)日:2017-05-04
In one aspect, phosphine compounds comprising three adamantyl moieties (PAd3) and associated synthetic routes are described herein. Each adamantyl moiety may be the same or different. For example, each adamantyl moiety (Ad) attached to the phosphorus atom can be independently selected from the group consisting of adamantane, diamantane, triamantane and derivatives thereof. Transition metal complexes comprising PAd3 ligands are also provided for catalytic synthesis including catalytic cross-coupling reactions.
An “On-Cycle” Precatalyst Enables Room-Temperature Polyfluoroarylation Using Sensitive Boronic Acids
作者:Liye Chen、Haydn Francis、Brad P. Carrow
DOI:10.1021/acscatal.8b00341
日期:2018.4.6
fluorinated arylboronic acid building blocks in cross-coupling has remained challenging, because of their acute base sensitivity. We report a general solution to this problem using a true catalytic intermediate, Pd(PAd3)(p-FC6H4)Br, as a uniquely effective “on-cycle” precatalyst that allows Suzuki–Miyaura coupling to occur much faster than even the most severe protodeboronation side reactions. Control of boron
交叉偶联中使用氟化芳基硼酸结构单元仍然具有挑战性,因为它们具有敏锐的碱敏感性。我们报告了使用真正的催化中间体Pd(PAd 3)(p -FC 6 H 4)Br作为唯一有效的“循环”预催化剂,可以使Suzuki-Miyaura偶联发生的速度快得多的一般解决方案。即使是最严重的原去硼副反应。还发现控制活性酸形式和休眠酯形式之间的硼形态在平衡催化速率与试剂分解之间起着至关重要的作用。该方法与任何氟化模式,对碱不稳定的官能团以及一系列溴(杂)芳烃均兼容。
Catalytic Preparation of Cyclic Carboxylic Esters
申请人:Spindler Felix
公开号:US20090275761A1
公开(公告)日:2009-11-05
Preparation of cyclic esters by hydrogenation of a carbonyl group in at least one anhydride radical —C(O)—O—C(O)— of a cyclic dicarboxylic or polycarboxylic anhydride by means of hydrogen in the presence of a homogeneous noble metal catalyst, characterized in that the hydrogenation is carried out in a homogeneous reaction mixture using an iridium catalyst. The cyclic esters are obtained in good chemical and optical yields when prochiral anhydrides are used together with chiral iridium catalysts.
[EN] MONO-LIGATED PALLADIUM CATALYSTS, THEIR SYNTHESIS AND USE IN SUZUKI COUPLING<br/>[FR] CATALYSEURS AU PALLADIUM MONO-LIGATURÉS, LEUR SYNTHÈSE ET LEUR UTILISATION DANS UN COUPLAGE DE SUZUKI
申请人:DOW GLOBAL TECHNOLOGIES LLC
公开号:WO2018106338A1
公开(公告)日:2018-06-14
The present invention is mono-ligated palladium catalysts that are easy to synthesize and are effective in Suzuki coupling reactions. Specifically these catalysts are characterized by an aromatic ring having a substituent with two nitrogen atoms one of which associates with the palladium atom.