N-Phenylurea was found to constitute a highly efficient, yet low-priced, phosphine-free ligand for the Pd-catalyzedHeck and room-temperature Suzukireactions of aryl bromides and iodides with very high turnover numbers (ca. 103–104).
Mizoroki–Heck reactions catalyzed by palladium dichloro-bis(aminophosphine) complexes under mild reaction conditions. The importance of ligand composition on the catalytic activity
作者:Miriam Oberholzer、Christian M. Frech
DOI:10.1039/c3gc40493e
日期:——
Dichloro-bis(aminophosphine) complexes of palladium with the general formula [(P(NC5H10)3−n(C6H11)n})2Pd(Cl)2] (where n = 0–2) are easily accessible, cheap and air stable, highlyactive and universally applicable C–C cross-coupling catalysts, which exhibit an excellentfunctionalgrouptolerance. The ligand composition of amine-substituted phosphines (controlled by the number of P–N bonds) was found
通式为[[P (NC 5 H 10)3- n(C 6 H 11)n })2 Pd(Cl)2 ]的钯的二氯双(氨基膦)配合物(其中n = 0–2)易于获得,价格低廉且空气稳定,高度活跃且通用的C–C交叉耦合催化剂,具有出色的官能团耐受性。这配体 组成 胺取代的 膦类 (受P–N键的数量控制)被发现可以有效地确定其在Heck反应中的催化活性,为此 纳米粒子被证明是它们的催化活性形式。二氯bis [bis [1,1',1''-(膦三基)三哌啶]]钯(1)质子)在[(P (NC 5 H 10)3- n(C 6 H 11)n })2 Pd(Cl)2 ](其中n = 0–3)系列中,是一个高活性的Heck催化剂 在100°C的温度下,因此是有效且通用的Heck的罕见例子 催化剂可以在温和的反应条件下(100°C或更低)有效运行,对于二氯-双(1,1'-(环己基膦基二基)二哌啶)钯(2,n = 1
<i>N</i>,<i>N</i>-Dimethyl-β-alanine as an Inexpensive and Efficient Ligand for Palladium-Catalyzed Heck Reaction
phosphine-free ligand than the previously reported ligand, N,N-dimethylglycine, in the Pd-catalyzed Heckreaction for a variety of aryl bromides, aryl iodides, and activated aryl chlorides with a practical turnover number of 10(3). Both kinetic and theoretical studies suggested that N,N-dimethyl-beta-alanine led to faster oxidative addition of an aryl halide to Pd than N,N-dimethylglycine. [reaction: see text]
Heterogeneous Fe3O4@chitosan-Schiff base Pd nanocatalyst: Fabrication, characterization and application as highly efficient and magnetically-recoverable catalyst for Suzuki–Miyaura and Heck–Mizoroki C–C coupling reactions
作者:A. Naghipour、A. Fakhri
DOI:10.1016/j.catcom.2015.10.002
日期:2016.1
environmentally friendly palladium-based catalyst supported on magnetite nanoparticles was successfully prepared. FT-IR, XRD, VSM, SEM, EDS and TGA studies have been used to characterize the nanocatalyst. The catalytic activity of the as-prepared catalyst was evaluated as a heterogeneous catalyst for the Suzuki–Miyaura carbon–carbon cross-coupling reaction of aryl halides and phenylboronic acid. Furthermore
[Graphics]N,O-Bidentate compounds were systematically evaluated as phosphine-free ligands for Pd-catalyzed C-C bond-formation reactions through kinetic measurements. Pd(quinoline-8-carboxylate)(2) was identified as one of the most efficient, yet still low-priced, phosphine-free catalysts for Heck as well as Suzuki reactions of unactivated aryl bromides with high turnover numbers up to ca. 10,000.