Article
Chemistry, Multidisciplinary
Gabriele Hierlmeier, Paolo Tosatti, Kurt Puentener, Paul J. J. Chirik
Summary: This study reports a new molybdenum ligand for catalyzing the hydrogenation of benzene, which is formed by the coordination of phosphino(imino)pyridine and cyclooctadiene. The experimental results indicate that the ligand can selectively generate cyclohexane catalyst in the presence of benzene, and the formation of the insertion product is a key step.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Juan Liu, Yi-Ying Du, Yu-Shi He, Yan Liang, Shang-Zhong Liu, Yi-Yi Li, Yi-Ming Cao
Summary: In this study, a chiral phosphoric acid catalyzed apparent hydrolytic ring-opening reaction was developed for racemic aziridines in a regiodivergent parallel kinetic resolution manner. Through the acyloxy-assisted strategy, highly stereocontrolled nucleophilic ring-opening of aziridines with water was achieved, resulting in enantioenriched amino alcohols with high yields and enantiomeric ratios.
Article
Chemistry, Physical
Jianghao Zhou, Jing Guo, Alexander Moiseevich Mebel, Govinda Ghimire, Feng Liang, Shuai Chang, Jin He
Summary: Investigated the dehydration reaction of primary amides in visible-light driven self-assembled gold nanoparticle-aromatic primary amide-gold nanoelectrode junctions. Used time-resolved surface enhanced Raman spectroscopy (SERS) to study the reaction dynamics and intermediates, revealing the role of gold surface adatoms and picocavities in stabilizing and amplifying the intermediates.
Article
Chemistry, Physical
Fachao Yan, Zijun Huang, Chen-Xia Du, Jian-Fei Bai, Yuehui Li
Summary: The FeI2-catalyzed reductive Strecker type reaction of formamides was reported, which successfully produced amino acetonitriles instead of aldehydes with higher yields than Ir or Rh catalysts. This method demonstrated the ability to one-pot construct complex molecules and conveniently produce homologated carboxylic acids from aldehydes.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Yungen Liu, Ka-Pan Shing, Vanessa Kar-Yan Lo, Chi-Ming Che
Summary: Transition-metal-catalyzed direct C-N bond formation reactions have been widely used for the synthesis of nitrogen-containing compounds. Iron catalysts are promising due to their cost-effectiveness and environmental sustainability, while ruthenium complexes provide more stability for studying the reaction mechanism. This Perspective summarizes the recent developments in iron and ruthenium complexes supported by macrocyclic or polydentate ligands for catalytic amination reactions involving metal imido/nitrene intermediates, and discusses the current limitations and potential opportunities for future research.
Article
Chemistry, Physical
Yuwei Li, Li Liu, Hanying Zhao
Summary: By utilizing hydrophobic interaction, multienzyme proteinosomes are fabricated with p-gal, GOx, and HRP on the surfaces in a model system using PDEGMA and bovine serum albumin. The immobilized enzymes show higher bioactivities than the free enzymes, facilitating direct transfer of the product as a substrate from one enzyme molecule to another.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Yuan-Yuan Gao, Chun-Lin Zhang, Ming-Lei Jin, Zhong-Hua Gao, Song Ye
Summary: N-heterocyclic carbene (NHC)-catalyzed enantioselective Mannich-type reactions of biomass-derived compound CMF with imines were developed, giving high-value-added chiral amines with good yields and excellent stereocontrol. The use of bifunctional NHC derived from L-pyroglutamic acid directed the remote addition of the trienolate intermediate to the imine in a highly stereocontrolled manner. This is the first enantioselective reaction proceeding via an NHC-bound trienolate intermediate.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Organic
Artem N. Fakhrutdinov, Bogdan Ya Karlinskii, Mikhail E. Minyaev, Valentine P. Ananikov
Summary: The analysis of products synthesized by Cu-catalyzed click reactions may be complicated by the presence of metal impurities, causing distortions and selectively removing signals in NMR spectra. Full undistorted spectra can be obtained through additional product treatment, more thorough purification, or recording at low temperatures. Impurities of paramagnetic metal ions in small amounts have been shown to lead to this effect, which may affect the interpretation of the chemical structure in NMR analysis.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Shi-Chao Ren, Wen-Xin Lv, Xing Yang, Jia-Lei Yan, Jun Xu, Fang-Xin Wang, Lin Hao, Huifang Chai, Zhichao Jin, Yonggui Robin Chi
Summary: A carbene-catalyzed reductive coupling reaction of carboxylic esters and substituted Hantzsch esters has been disclosed, which is promoted by visible light irradiation and allows for incorporation of sophisticated structures, including those found in medicines, into ketone molecules under mild conditions.
Review
Biotechnology & Applied Microbiology
Chenming Huang, Junling Liu, Jiali Fang, Xian Jia, Zhendong Zheng, Song You, Bin Qin
Summary: This review discusses the advances in the research area of KRED-catalyzed asymmetric synthesis for biomanufacturing of chiral chemicals with at least two chiral centers through the kinetic resolution (KR) approach and the dynamic kinetic resolution (DKR) approach.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Chemistry, Applied
Leon Bork, Paul T. Haase, Sascha Rohn, Clemens Kanzler
Summary: Chemical reactions of reducing sugars and amino compounds result in the formation of heterogeneous, high molecular weight colorants (melanoidins) with unknown structures. Model experiments using reactive intermediates were conducted to understand the formation mechanisms of colored reaction products. Norfuraneol, a reactive methylene compound, was incubated individually or combined with glyoxal, glycolaldehyde, and acetaldehyde at elevated temperatures. Photometric, chromatographic, and mass spectrometric methods were employed to analyze the colored reaction products and investigate the reactivity of different carbonyls. Aqueous solutions of norfuraneol and glyoxal showed the highest color formation among the model reaction systems, and it was observed that the initial reactants and their degradation products were incorporated into the colorants. The colored oligomers identified in this study were composed of carbohydrate-based intermediates of the Maillard reaction and termed as melanoidin precursors or pre-melanoidins.
Article
Chemistry, Applied
Long Chen, Lijuan He, Baohong Zheng, Gang Wei, Hu Li, Heng Zhang, Song Yang
Summary: In this study, a novel bifunctional catalytic material 30%Sn-MMT-SO3H was fabricated and successfully applied in converting Jatropha curcas oil into biodiesel. The material showed high activity, reusability, and promising prospects for industrialization of biodiesel production.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jingjing Li, Jianxun Ye, Jiayu Zhou, Jing Li, Delong Liu, Wanbin Zhang
Summary: The efficient RuPHOX-Ru catalyzed asymmetric hydrogenation of alpha-substituted tetralones via a dynamic kinetic resolution has been achieved for the synthesis of chiral tetrahydronaphthols. The mechanism study revealed that hydrogenation with H-2 gas is predominant in the reaction pathway compared to transfer hydrogenation with EtOH solvent as the hydrogen source.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Organic
Jian Song, Wen-Hua Zheng
Summary: A highly enantioselective method for the kinetic resolution of racemic tertiary alcohols has been developed using chiral organotin-catalyzed intermolecular acylation. The process can be carried out under mild reaction conditions and has a broad substrate scope, allowing for the separation of the corresponding products and highly enantioselective recovery of tertiary alcohols with s factors up to >200.
Article
Chemistry, Organic
Yue Zhu, Jiayu Zhou, Jing Li, Kai Xu, Jianxun Ye, Yufei Lu, Delong Liu, Wanbin Zhang
Summary: The kinetic resolution of azaflavanones has been successfully achieved through RuPHOX-Ru catalyzed asymmetric hydrogenation, providing chiral azaflavanones and azaflavanols with high yields. The reaction can be performed on a gram-scale with low catalyst loading, allowing for various transformations. It has been demonstrated that the process is highly efficient through deuterium labelling and racemization experiments.
ORGANIC CHEMISTRY FRONTIERS
(2021)