Highly Active Catalyst for the Heterogeneous Suzuki−Miyaura Reaction: Assembled Complex of Palladium and Non-Cross-Linked Amphiphilic Polymer
作者:Yoichi M. A. Yamada、Koji Takeda、Hideyo Takahashi、Shiro Ikegami
DOI:10.1021/jo034354v
日期:2003.10.1
An assembled insoluble catalyst, PdAS, prepared from palladium ((NH4)2PdCl4 (1)) and non-cross-linked amphiphilic copolymer poly(N-isopropylacrylamide-co-4-diphenylstyrylphosphine) (2) was developed. It was found that PdAS is an excellent catalyst for the Suzuki-Miyaura reaction on three points: (1) The use of 8 x 10(-7) to 5 x 10(-4) mol equiv of PdAS afforded the coupling products efficiently after
开发了由钯((NH4)2PdCl4(1))和非交联两亲共聚物聚(N-异丙基丙烯酰胺-co-4-二苯基苯乙烯基膦)(2)制备的组装的不溶催化剂PdAS。已发现,PdAS在以下三个方面是铃木-宫浦反应的优良催化剂:(1)使用8 x 10(-7)到5 x 10(-4)摩尔当量的PdAS在偶联后有效地提供了偶联产物简单的后处理,营业额高达1,250,000。(2)催化剂可重复使用多次而不会损失催化活性。(3)PdAS在任何反应介质(即水或水性或无水有机溶剂)中均显示出良好的稳定性。对PdAS的分析研究表明2中的膦与钯配位形成PdCl2(PPh2Ar)2物种。
General Olefin Synthesis by the Palladium‐Catalyzed Heck Reaction of Amides: Sterically Controlled Chemoselective NC Activation
作者:Guangrong Meng、Michal Szostak
DOI:10.1002/anie.201507776
日期:2015.11.23
Metal‐catalyzed reactions of amides proceeding via metal insertion into the NCO bond are severely underdeveloped due to resonance stabilization of the amide bond. Herein we report the first Heck reaction of amides proceeding via highly chemoselective NCO cleavage catalyzed by Pd0 utilizing amide bond ground‐state destabilization. Conceptually, this transformation provides access to a myriad of metal‐catalyzed
A mild and practical procedure for the Wittig olefination, promoted by lithium hydroxide and triphenylbenzyl phosphonium bromide, has been set up for the synthesis of stilbenes and styrenes. The experimental conditions allow aromatic, heteroaromatic, unsaturated and saturated aliphatic aldehydes to give final products in good yields.
Cross metathesis of methyl oleate (MO) with terminal, internal olefins by ruthenium catalysts: factors affecting the efficient MO conversion and the selectivity
作者:Nor Wahida Awang、Ken Tsutsumi、Barbora Huštáková、Siti Fairus M. Yusoff、Kotohiro Nomura、Bohari M. Yamin
DOI:10.1039/c6ra24200f
日期:——
(CM) reactions of methyloleate (MO) with cis-4-octene (OC), cis-stilbene (CS) using RuCl2(PCy3)(IMesH2)(CHPh) [IMesH2 = 1,3-bis(2,4,6-trimethylphenyl)imidazolin-2-ylidene; Cy = cyclohexyl] afforded CM products with high MO conversion and high selectivity under high molar (OC/MO, CS/MO) ratios; CM with cis-1,4-diacetoxy-2-butene also afforded metathesis products with high MO conversion under certain conditions
Retracted Article: Monodisperse CuB<sub>23</sub> nanoparticles grown on graphene as highly efficient catalysts for unactivated alkyl halide Heck coupling and levulinic acid hydrogenation
作者:Shi Yan Fu、Yuan Zhi Li、Wei Chu、Chun Li、Dong Ge Tong
DOI:10.1039/c4cy01331j
日期:——
Monodisperse CuB23 nanoparticles grown on graphene exert exceedingly high activity towards unactivated alkyl halide Heck coupling and levulinic acid hydrogenation.