[EN] COMPLEXES OF N-HETEROCYCLIC CARBENES FOR TRANSITION METAL CATALYSIS [FR] COMPLEXES DE CARBÈNES N-HÉTÉROCYCLIQUES POUR LA CATALYSE PAR DES MÉTAUX DE TRANSITION
Synthesis and catalytic application of Pd complex catalysts: Atom-efficient cross-coupling of triarylbismuthines with haloarenes and acid chlorides under mild conditions
作者:B.D. Jadhav、S.K. Pardeshi
DOI:10.1002/aoc.3591
日期:2017.4
palladium centre. The resultant Pd(II) complexes were tested as catalysts for the coupling of organobismuth(III) compounds with aryl and acid halides leading to excellent yields with high turnover frequency values. The catalysts were stable under the reaction conditions and no degradation was noticed even at 150°C for one of the catalysts. The reaction proceeds via an aryl palladium complex formed by transmetallation
钯催化的交叉偶联反应是在有机合成中构建新的碳-碳键的最常用的合成工具。在提出的工作中,以氯化钯和氮供体配体为前体合成了Pd(II)络合物催化剂。红外和11 H NMR光谱分析表明,钯络合物以二齿模式形成到钯中心。测试了所得的Pd(II)配合物作为有机铋(III)化合物与芳基和酰基卤偶联的催化剂,从而以高周转频率值获得了优异的收率。该催化剂在反应条件下是稳定的,甚至对于其中一种催化剂,即使在150℃也没有观察到降解。反应通过在催化剂和Ar 3 Bi之间的金属转移反应形成的芳基钯配合物进行。整个合成转化具有很高的原子经济性,因为与铋连接的所有三个芳基都可以有效地转移到亲电子配偶体上。
Palladium-catalysed N,N′-disubstituted urea synthesis by oxidative carbonylation of amines under CO and O2 at atmospheric pressure
作者:Potenzo Giannoccaro
DOI:10.1016/0022-328x(87)87174-7
日期:1987.12
reaction of aromatic and aliphatic primary amines in alcohol solution with CO and O2 under mild conditions (70–90°C, 1 atm) and in the presence of catalytic amounts of PdCl2 or a palladium(II) complex. Under more drastic temperature and pressure conditions carbamate esters were obtained instead. In the aniline carbonylation, the catalysis involves the following reactions: Reaction (1) occurs at room temperature
通过在温和的条件下(70–90°C,1 atm)和催化量的四氢呋喃存在下,醇溶液中的芳香族和脂肪族伯胺与CO和O 2反应,可以以高收率获得N,N'-二取代尿素。 PdCl 2或钯(II)配合物。在更剧烈的温度和压力条件下,获得了氨基甲酸酯。在苯胺羰基化反应中,催化反应涉及以下反应:反应(1)在室温下发生,但反应(2)则需要更剧烈的条件(70–90°C)。鎓盐,如PhNH的影响3 + X -(X =氯,I)或氯化亚铜2对CuCl 2的催化活性也进行了研究,取得了最佳效果。当在醇中进行反应时,涉及一氧化碳氧化的副反应几乎被抑制,但是当使用THF或二甲氧基丙烷作为溶剂时,副反应被增强。
Mechanism of the formation of palladium complexes serving as catalysts in hydrogenation reactions
isolated as products of the reactions of (PPh3)2PdCl2]2 or [(PPh3)PdCl2]2 with H2 in organic amines (Am). Similar products were obtained when (Ph3P)2Pd(Ph)Br was treated with H23 Both in amines and aromatic solvents. The reaction between H2 and [(PBu3)PdCl2]2 resulted in the formation of [(PBu3(PBu2)PdCl2 ·. 2 Am The kinetic data for H2 absorption by solutions of palladium(II) complexes are consistent
Cyclopalladation of <i>meta</i>-(Diphenylthiophosphoryloxy)benzaldimines: <i>NCS</i> and Unexpected <i>NCO</i> 5,6-Membered Pincer Palladium Complexes
作者:V. A. Kozlov、D. V. Aleksanyan、Yu. V. Nelyubina、K. A. Lyssenko、A. A. Vasil’ev、P. V. Petrovskii、I. L. Odinets
DOI:10.1021/om9009894
日期:2010.5.10
moderate to good yields. The same reaction in dichloromethane followed by treatment with alcohol resulted in unexpected formation of the related NCO-palladacycles 5a,b, along with the above NCS-complexes. Complexes 5 present the products of formal oxidation of the P═S group in the starting ligand, which apparently proceeds in the metal ion coordination sphere. Realization of κ3-NCS and κ3-NCO coordination
Metal complexes of N-allylaniline. A palladium(II) complex with co-ordination number of greater than four
作者:Michele Aresta、C. Francesco Nobile、Domenico Petruzzelli、Martin L. Tobe
DOI:10.1039/dt9770000493
日期:——
N-Allylaniline (aa) can act as a uni- or bi-dentate ligand in complexes of composition [PdCl2(aa)2] affording an orange-yellow (1) and a dark red isomer (2). The palladium in (1) is four-co-ordinate and planar, with the olefin group unbound in benzene and dimethyl sulphoxide (dmso) solution. The olefin groups in (2) are bound to the palladium, which, in solution (NN-dimethylformamide, dmso, or acetone)