Probing the catalytic potential of chloro nitrosyl rhenium(i) complexes
作者:Yanfeng Jiang、Olivier Blacque、Heinz Berke
DOI:10.1039/c0dt00842g
日期:——
afforded the Re(I) dichloride complex [ReCl2(NO)(CH3CN)3] (2). Subsequent ligand substitution reactions with PCy3, PiPr3 and P(p-tolyl)3 afforded the bisphosphine Re(I) complexes [ReCl2(NO)(PR3)2(CH3CN)] (3, R = Cy a, iPr b, p-tolyl c) in good yields. The acetonitrile ligand in 3 is labile, permitting its replacement with H2 (1 bar) to afford the dihydrogen Re(I) complexes [ReCl2(NO)(PR3)2(η2-H2)] (4
A Convenient and Efficient Rhenium-Catalyzed Hydrosilylation of Ketones and Aldehydes
作者:Hailin Dong、Heinz Berke
DOI:10.1002/adsc.200900246
日期:2009.8
The easily available rhenium(I) complex [Re(CH3CN)3Br2(NO)] catalyzes the homogeneous hydrosilylation of a great variety of organic carbonyl compounds (ketones and aldehydes). The reaction is quite sensitive to the solvent applied. Chlorobenzene was found to be superior over all the other solvents used. Various aliphatic and aromatic silanes were tested. Excellent yields were achieved at 85 °C in chlorobenzene
易于获得的rh(I)络合物[Re(CH 3 CN)3 Br 2(NO)]催化多种有机羰基化合物(酮和醛)的均相氢化硅烷化。该反应对所施加的溶剂非常敏感。发现氯苯优于所用的所有其他溶剂。测试了各种脂肪族和芳香族硅烷。使用三乙基硅烷,在85°C的氯苯中,获得了优异的收率,该反应的TOF值高达495 h -1。提出了可能的氢化硅烷化反应机理。
A Direct Reduction of Aliphatic Aldehyde, Acyl Chloride, Ester, and Carboxylic Functions into a Methyl Group
smooth partial reduction to the corresponding TES-protected benzylic alcohols. It was shown that, unlike the reduction of aliphatic substrates, the exhaustive reduction of aromatic substrates was not straightforward: a concurrent Friedel-Crafts-like alkylation process competed with the reduction yielding trace to notable amounts of dimeric products, thus decreasing the overall selectivity of the reduction
BICAAC-Derived Covalent and Cationic Ir(I) Complexes: Application of Ir(BICAAC)Cl(COD) Complexes as Catalysts for Transfer Hydrogenation and Hydrosilylation Reactions
作者:Mandeep Kaur、Manu Adhikari、Krishna K. Manar、Yuvraj Yogesh、Darsana Prakash、Sanjay Singh
DOI:10.1021/acs.inorgchem.3c01914
日期:2024.1.22
(Me/iPrBICAAC) upon reaction with [IrCl(COD)]2 smoothly afford mononuclear Ir(I) complexes that have been spectroscopically and structurally characterized. These complexes exhibit good catalytic activity for transfer hydrogenation (TH) of 4-chlorobenzaldehyde using isopropyl alcohol (iPrOH), with turnover frequency values ranging between 6269 and 8093 h–1. Choosing the covalent complex Ir(MeBICAAC)Cl(COD)
两亲性双环(烷基)(氨基)卡宾( Me/iPr BICAAC)与[IrCl(COD)] 2反应后顺利生成单核Ir(I)配合物,并已对其进行了光谱和结构表征。这些配合物对使用异丙醇 (iPrOH) 的 4-氯苯甲醛转移氢化 (TH) 表现出良好的催化活性,周转频率值范围在 6269 至 8093 h –1之间。选择共价配合物 Ir( Me BICAAC)Cl(COD) 作为催化剂,对一系列用吸电子和给电子取代基功能化的羰基和亚胺进行了研究,并以中等到良好的产率提供了还原产物。当Ir( Me BICAAC)Cl(COD)在甲苯-d 8或异丙醇-d 8中长时间加热时,没有观察到BICAAC单元从Ir中心脱离,这证明了催化剂良好的热稳定性。配合物 Ir( Me BICAAC)Cl(COD) 还被发现对使用三乙基硅烷 (Et 3 SiH) 的多种醛的氢化硅烷化具有催化活性。
A Versatile Iridium(III) Metallacycle Catalyst for the Effective Hydrosilylation of Carbonyl and Carboxylic Acid Derivatives
IrIII metallacycle rapidly and selectively catalyses the reduction of various esters, carboxylic acids, ketones, and aldehydes. The reactions proceed in high yields at room temperature by hydrosilylation followed by desilylation. Depending on the substrate, esters are reduced to alcohols or ethers and carboxylic acids to alcohols or aldehydes.