Article
Chemistry, Multidisciplinary
Thomas Roth, Rebecca Evertz, Niklas Kopplin, Sebastien Tilloy, Eric Monflier, Dieter Vogt, Thomas Seidensticker
Summary: Aqueous hydroaminomethylation (HAM) is a Green process for the efficient production of amines from basic chemicals. In this study, a continuous process for HAM in an aqueous multiphase system was successfully established. By adding randomly methylated-beta-cyclodextrin as a mass transfer agent, high yields and selectivities were achieved in several continuous experiments. The addition of cyclodextrin made it unnecessary to use solvents.
Article
Chemistry, Organic
Runtong Zhang, Xin Yan, Caiyou Chen, Ya-Nan Duan, Xintong He, Shao-Tao Bai, Xumu Zhang
Summary: This paper demonstrates the integration of a Milstein-type Ru-PNN catalyst and a Rh-Tribi/Tetrabi catalyst, resulting in highly improved isomerization linear selective hydroformylation of internal alkenes. The obtained yields exhibit excellent linear selectivities and activities compared to the Ru-PNN/Rh-Bisbi system.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Organic
Xin Jin, Hong-Chen Fu, Mei-Yan Wang, Shouying Huang, Yue Wang, Liang-Nian He, Xinbin Ma
Summary: A novel strategy for selective catalytic reactions in the synthesis of alcohols has been developed in this study, utilizing formic acid and hydrosilane. The products, allylic alcohols and beta-branched alkyl alcohols, were produced with high levels of Z/E-, regio-, and enantioselectivity by simply adjusting the amount of formic acid and reaction temperature.
Article
Chemistry, Multidisciplinary
Cheng Li, Siqi Li, Haoran Liang, Haiyan Fu, Hua Chen
Summary: A new rotationally hindered diphosphoramidite ligand has been successfully applied in the Rh-catalyzed hydroformylation reaction of various olefins, showing good activity and excellent regioselectivity towards the formation of linear aldehydes. Remarkable performances were also observed in the hydroformylation of functionalized olefins, including methyl acrylate, allyl acetate, crotonaldehyde ethylene acetal, and styrene.
CHEMICAL COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Rui Sang, Yuya Hu, Rauf Razzaq, Guillaume Mollaert, Hanan Atia, Ursula Bentrup, Muhammad Sharif, Helfried Neumann, Henrik Junge, Ralf Jackstell, Bert U. W. Maes, Matthias Beller
Summary: Using CO2 as C1-feedstock for the chemical industry has attracted great attention. Here the authors develop a two-step cascade process to perform catalytic carbonylations of olefins, alkynes, and aryl halides using CO2 and H-2.
NATURE COMMUNICATIONS
(2022)
Review
Chemistry, Multidisciplinary
Boyang Liu, Yu Wang, Ning Huang, Xiaocheng Lan, Zhenhua Xie, Jingguang G. Chen, Tiefeng Wang
Summary: This review summarizes the developments of catalysts for heterogeneous hydroformylation in the last decade and proposes potential modification methods for future improvements. The hydroformylation properties of different reactants are compared in order to emphasize the unique challenges faced by various olefins. The catalytic properties can be tuned through electronic effects, steric hindrance, and reaction condition optimization.
Article
Chemistry, Inorganic & Nuclear
Taeil Shin, Taehoon Jang, Hyunwoo Kim
Summary: Propene is the most important reactant in hydroformylation reactions on an industrial scale. The regioselectivity control in this reaction is of great interest. A highly reactive and regio-controlled propene hydroformylation has been achieved using a Rh catalyst with a sterically bulky pi-acceptor phosphorus ligand. The ligand combination shows high regioselectivity and reactivity during the reaction.
Review
Chemistry, Physical
Shepherd Siangwata, Cody Williams, Nikechukwu Omosun, Siyabonga Ngubane, Gregory S. Smith
Summary: Metallodendrimers have shown great potential as catalysts in hydroformylation reactions involving olefins, with their dendritic scaffolds influencing both the activity and selectivity of the catalyst. The recyclability of rhodium-bearing metallodendrimers through heterogenization of homogeneous catalysts presents an attractive option for sustainable use of mineral resources, especially in the case of rare, expensive, and fast-depleting metals like rhodium.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Energy & Fuels
Weili Jiang, Jicong Li, Mengying Wu, Limei He, Guanglin Zhou, Zhongrong Wang
Summary: Three kinds of porous organic polymers (POPs) containing N or P atoms were prepared and used as supports for Rh catalysts. The structures and compositions of these polymers were fully characterized. The Rh-N-POP showed a larger BET surface area and pore volume due to the bulk extrusion of triphenylphosphine (TPP) unit. The hydroformylation activity was promoted by the presence of free ligands in Rh-N-POP, but isomerization was greatly promoted by the TPP structure.
Article
Multidisciplinary Sciences
Peng Gao, Guanfeng Liang, Tong Ru, Xiaoyan Liu, Haifeng Qi, Aiqin Wang, Fen-Er Chen
Summary: Single-atom Rh catalysts show superior activity in olefins hydroformylation but limited success in regioselectivity control. By developing a Rh1 single-atom catalyst with nanodiamond as support, the catalyst achieved good to excellent regioselectivities in hydroformylation of arylethylenes, comparable to homogeneous counterparts. The coordination interaction between Rh-1 and surface phosphorus species was clarified by P-31 solid-state NMR and X-ray absorption spectroscopy.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Alicia Martinez-Carrion, Andres Romero-Navarro, Jose Luis Nunez-Rico, Albert Gutierrez, Arnald Grabulosa, Anton Vidal-Ferran
Summary: Active catalysts derived from cobalt and the Xantphos ligand were synthesized and tested in the hydroformylation of pure linear alkenes or their mixtures. The catalyst showed good reactivity and selectivity, converting linear alkenes into linear aldehydes with consistent regioselectivity regardless of the starting materials' position or geometry of the C=C double bond. Additionally, this chemistry proved to be an interesting strategy for valorizing mixtures of linear alkenes, producing a major aldehyde while limiting the formation of by-products.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Shuailong Li, Dequan Zhang, Runtong Zhang, Shao-Tao Bai, Xumu Zhang
Summary: This article reports a novel rhodium catalyst that enables highly efficient and selective hydroformylation of cyclopropyl-functionalized trisubstituted alkenes, resulting in valuable chiral cyclopropyl entities. The modified ligand used in this study exhibits superior performance compared to traditional diphosphine ligands in asymmetric catalysis. Gram-scale reactions and subsequent transformations of the products were also demonstrated.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Nikechukwu N. Omosun, Siyabonga Ngubane, Gregory S. Smith
Summary: Rhodium(I) poly(aryl ether)-based, core-functionalised alpha-diimine metallodendrimers were studied as catalyst precursors in the rhodium-catalysed hydroformylation of terminal olefins. The electrochemical behavior showed irreversible and quasi-reversible behavior. All catalyst precursors exhibited excellent conversions and chemoselectivity, with higher dendritic catalysts giving better regioselectivity towards linear aldehydes.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Multidisciplinary
Xin Yan, Runtong Zhang, Jiang Wang, Hongyi Yu, Jialin Wen, Shao-Tao Bai, Xumu Zhang
Summary: A selective and stable tetraphosphite ligand has been reported for rhodium-catalyzed linear hydroaminomethylation of aliphatic and aromatic terminal olefins. This method demonstrates high catalyst efficiency and atom economy, leading to the synthesis of high purity products.
REACTION CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Joseph P. Tassone, Jihyeon Yeo, Jonathan A. Ellman
Summary: A series of carbon alpha-quaternary aldehydes are synthesized via Co(iii)-catalysed reactions, representing a rare example of intermolecular carboformylation. Various internally substituted dienes can be used as substrates, leading to complex alpha-quaternary aldehyde products. Mechanistic investigations on the catalytic cycle and the role of an effective additive have been conducted.
Correction
Chemistry, Applied
Jia Liu, Juntong Dong, Xiaodan Li, Teng Xu, Zhenguo Li, Jeffrey Dankwa Ampah, Mubasher Ikram, Shihai Zhang, Chao Jin, Zhenlong Geng, Tianyun Sun, Haifeng Liu
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Seba Alareeqi, Daniel Bahamon, Kyriaki Polychronopoulou, Lourdes F. Vega
Summary: This study explores the potential application of single-atom-alloy (SAA) catalysts in bio-oils hydrodeoxygenation refining using density functional theory (DFT) and microkinetic modeling. It establishes the relationships between stability, adsorptive properties, and activity structures for bio-oil derivatives, providing guidance for the synthesis of cost-effective SAA combinations.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Bin Hu, Wen -Ming Zhang, Xue-Wen Guo, Ji Liu, Xiao Yang, Qiang Lu
Summary: This study explored the pyrolysis behaviors and mechanisms of different monosaccharides, including arabinose, galactose, galacturonic acid, and glucuronic acid. The roles of structural differences in these monosaccharides were analyzed, and it was found that glucuronic acid undergoes a special C-C bond breaking reaction during pyrolysis. The findings provide a deep understanding of the pyrolysis chemistry of hemicellulose and the role of different branches.
FUEL PROCESSING TECHNOLOGY
(2024)
Review
Chemistry, Applied
Youwei Zhi, Donghai Xu, Guanyu Jiang, Wanpeng Yang, Zhilin Chen, Peigao Duan, Jie Zhang
Summary: Hydrothermal carbonization (HTC) is an effective method for the harmless disposal of municipal sludge (MS) and offers potential applications for the obtained products. Optimizing reaction conditions, coupling with other waste materials, and combining different processes can improve the performance of HTC. Furthermore, HTC contributes to energy recovery and enhances the quality of life cycle assessment.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Jia Wang, Jianchun Jiang, Dongxian Li, Xianzhi Meng, Arthur J. Ragauskas
Summary: This study presents a scalable process for converting holocellulose and cellulosic wastes into advanced oxygen-containing biofuels with high furan, cyclic ketone, and ethanol content. By combining hydropyrolysis and vapor-phase hydrodeoxygenation using Pd/Al2O3 as a catalyst, the researchers achieved high yields and conversions. The integrated process holds great promise for biomass waste conversion into advanced biofuels.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Florian Held, Jannis Reusch, Steffen Salenbauch, Christian Hasse
Summary: The accurate prediction and assessment of soot emissions in internal combustion engines are crucial for the development of sustainable powertrains. This study presents a detailed quadrature-based method of moments (QMOM) soot model coupled with a state-of-the-art flow solver for the simulation of gasoline engines. The model accurately describes the entire cause-and-effect chain of soot formation, growth and oxidation. Experimental validation and engine cycle simulations are used to identify the root cause of observed soot formation hotspots.
FUEL PROCESSING TECHNOLOGY
(2024)