The solvent determines the product in the hydrogenation of aromatic ketones using unligated RhCl<sub>3</sub> as catalyst precursor
作者:Soumyadeep Chakrabortty、Nils Rockstroh、Stephan Bartling、Henrik Lund、Bernd H. Müller、Paul C. J. Kamer、Johannes G. de Vries
DOI:10.1039/d1cy01504d
日期:——
Alkyl cyclohexanes were synthesized in high selectivity via a combined hydrogenation/hydrodeoxygenation of aromaticketones using ligand-free RhCl3 as pre-catalyst in trifluoroethanol as solvent. The true catalyst consists of rhodiumnanoparticles (Rh NPs), generated in situ during the reaction. A range of conjugated as well as non-conjugated aromaticketones were directly hydrodeoxygenated to the corresponding
Rhodium and Iridium Nanoparticles Entrapped in Aluminum Oxyhydroxide Nanofibers: Catalysts for Hydrogenations of Arenes and Ketones at Room Temperature with Hydrogen Balloon
作者:In Soo Park、Min Serk Kwon、Kyung Yeon Kang、Jae Sung Lee、Jaiwook Park
DOI:10.1002/adsc.200600651
日期:2007.8.6
showed high activities in the hydrogenation of various arenes and ketones under mild conditions. Selective hydrogenation was possible for bicyclic and tricyclic arenes in high yields. The catalysts were active at room temperature even with a hydrogenballoon. Also, the catalysts showed high turnover frequency (TOF) values under solventless conditions at 75 °C under 4 atm hydrogen pressure: ca. 1700 h−1 in
可循环利用的金属纳米颗粒催化剂,氢氧化铝中的铑[Rh / AlO(OH)]和氢氧化铝中的铱[Ir / AlO(OH)],是从容易获得的试剂中简单制备的。在温和的条件下,该催化剂在各种芳烃和酮的氢化中显示出高活性。双环和三环芳烃的选择性加氢可能以高收率进行。该催化剂即使在具有氢气球的情况下在室温下也具有活性。此外,催化剂显示无溶剂的条件下高转化频率(TOF)值在75℃下4个大气压的氢气压力:约 1700小时-1在苯的氢化中。此外,Rh / AlO(OH)可以重复使用至少10次而不会失去活性。通过透射电子显微镜(TEM),粉末X射线衍射(XRD),电感耦合等离子体(ICP),能量色散X射线分析(EDX),X射线光电子能谱(XPS),氮吸附来表征催化剂和氢化学吸附实验。铑和铱粒子的大小分别估计为3–4 nm和2–3 nm。这些催化剂的氢氧化铝氧化铝纤维的表面积为500–600 m 2 g -1。
Chemoselective and Tandem Reduction of Arenes Using a Metal–Organic Framework-Supported Single-Site Cobalt Catalyst
作者:Neha Antil、Ajay Kumar、Naved Akhtar、Wahida Begum、Manav Chauhan、Rajashree Newar、Manhar Singh Rawat、Kuntal Manna
DOI:10.1021/acs.inorgchem.1c03098
日期:2022.1.17
five times without decreased activity. The same MOF-Co catalyst was also efficient for tandem hydrogenation–hydrodeoxygenation of aryl carbonyl compounds, including biomass-derived platform molecules such as furfural and hydroxymethylfurfural to cycloalkanes. In the case of hydrogenation of cumene, our spectroscopic, kinetic, and density functional theory (DFT) studies suggest the insertion of a trisubstituted
dihydrogen and hydride transfer accomplish the hydrogenation of heteroarenesunder homogeneous conditions. In contrast, carbocyclic aryl motifs are hydrogenated via a heterogeneous pathway, by in situ generated ruthenium nanoparticles. Remarkably, these hydrogenation reactions can be performed using molecular hydrogen under solvent-free conditions or with 1,4-dioxane, and thus give access to a broad range
一个简单的双核monohydrido桥接钌络合物[(η 6 - p -cymene)的RuCl} 2(μ-H-μ-Cl)的]充当各种杂芳烃和芳烃的氢化的有效的和选择性的催化剂。使用包括原位反应监测,动力学研究,定量中毒实验和电子显微镜在内的多种技术组合研究了催化活性物质的性质,证明了双重反应性。结果表明杂芳烃的氢化通过分子催化进行。特别地,监测通过NMR光谱反应进展表明,[(η 6 - p -cymene)的RuCl} 2(μ-H–μ-Cl)]转化为单体钌中间体,随后通过二氢活化和氢化物转移,在均相条件下完成了杂芳烃的氢化反应。相反,碳环芳基基序通过异质途径被原位生成的钌纳米粒子氢化。值得注意的是,这些氢化反应可以在无溶剂条件下使用分子氢或与1,4-二恶烷进行,因此可以在不产生废物的情况下接触到广泛的饱和杂环和碳环化合物。
Hydrogenation of Aromatic Substrates over Dispersed Ni–Mo Sulfide Catalysts in System H2O/CO
作者:A. V. Vutolkina、D. F. Makhmutov、A. V. Zanina、A. L. Maximov、A. P. Glotov、N. A. Sinikova、E. A. Karakhanov
DOI:10.1134/s0965544118070095
日期:2018.7
The activity of unsupported Ni–Mo sulfide catalysts formed during the in situ decomposition of oil-soluble precursors (molybdenum hexacarbonyl, nickel naphthenate) in the hydrogenation of aromatic and naphthene-aromatic compounds is studied. The catalysts are characterized by HRTEM and XPS. Catalytic experiments are conducted at temperatures of 340–380°C and an increased pressure of ?? in the presence