Article
Chemistry, Physical
Avik Chowdhury, Sudip Bhattacharjee, Sayantan Chongdar, Bhabani Malakar, Anindita Maity, Asim Bhaumik
Summary: A novel porous magnesium aluminum phosphate (MALPO) material with high specific surface area and hierarchical porosity was synthesized through a hydrothermal template-free approach. MALPO exhibited excellent catalytic performance in Knoevenagel condensation reaction, yielding up to 99% yield of the products.
Article
Chemistry, Multidisciplinary
Na Liu, Feng Wu, Jie Xu, Fei Wang, Bing Xue, Jun Luo
Summary: In this study, CN/SBA15 catalysts were prepared by impregnation method and applied in the Knoevenagel condensation reaction. The catalysts were characterized by various analytical techniques and the results showed that the introduction of carbon nitride maintained the ordered mesoporous structure of SBA-15. The distribution of nitrogen-containing functional groups in the CN/SBA15 catalysts could be controlled by adjusting the calcination temperature. The CN/SBA15-400 catalysts exhibited excellent catalytic activity in the Knoevenagel condensation reaction.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Chemistry, Multidisciplinary
Zhewei Weng, Naoki Ogiwara, Takashi Kitao, Yuji Kikukawa, Yu Gao, Likai Yan, Sayaka Uchida
Summary: The study reports the first porous ionic crystals (PICs) composed of Nb or Ta, which are used as solid catalysts for efficient Knoevenagel condensation reactions. Investigation into the crystal structures, theoretical calculations, and in situ IR spectroscopy reveals the crucial role of exposing POMs to the pore surface of PICs in determining their catalytic performance.
Article
Chemistry, Inorganic & Nuclear
Zahra Salehi Rozveh, Seyedeh Pegah Aledavoud, Seyed Mohammad Hosseini, Meghdad Karimi, Vahid Safarifard
Summary: The stability and catalytic activity of Cu-based amino-functionalized metal-organic frameworks were tested in Knoevenagel condensation. Amino-based MOFs with different ratios of benzene-1,4-dicarboxylic acid (H2BDC) and 2-amino-benzene-1,4-dicarboxylic acid (NH2-BDC) were synthesized, and NH2(33%)-Cu-MOF showed the best catalytic performance. The optimal balance between pore size and basic amine sites of the framework was provided by this ratio. The stability of NH2(33%)-Cu-MOF was proved by PXRD patterns, and the catalyst remained crystalline after the catalysis process.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Physical
Paloma Gomes de Abrantes, Israel Ferreira Costa, Nathalia Kellyne da Silva Marinho Falcao, Joao Marcos Gomes de Oliveira Ferreira, Claudio Gabriel Lima Junior, Ercules Epaminondas de Sousa Teotonio, Juliana Alves Vale
Summary: In this study, an efficient heterogeneous catalyst based on low molecular weight chitosan modified with EDTA groups was prepared and applied in the Knoevenagel Condensation reaction, demonstrating fast reactions with excellent yields at room temperature. The catalyst showed significant surface modification and short reaction times, and could be easily recovered and reused without significant loss of catalytic activity.
Article
Chemistry, Multidisciplinary
Fancheng Meng, Shuai Bi, Zuobang Sun, Dongqing Wu, Fan Zhang
Summary: A concise approach to vinylene-linked covalent organic frameworks was established by conducting Knoevenagel condensation at the multi-methyl groups of a pyridine ring. Using this method, two highly crystalline COFs with large specific surface areas were constructed. The stable and abundant pyridine-decorated nanochannels within the COFs exhibited excellent catalytic performance in the esterification of pharmaceutical intermediates with high selectivity and recyclability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Yeonghun Kim, Sanghyeop Lee, Ying-Pin Chen, Byeongchan Lee, Sunggi Lee, Jinhee Park
Summary: An unprecedented correlation between the catalytic activity of a Zr-based UiO-type MOF and its degree of interpenetration is reported. Partially interpenetrated MOFs exhibit higher catalytic activity, possibly due to higher substrate concentration and close arrangement of catalytically active sites in the interpenetrated structure.
Article
Chemistry, Physical
Tao Zhang, Hongtai Chen, Shurong Liu, Hongxiao Lv, Xiutang Zhang, Qiaoling Li
Summary: The research demonstrates the synthesis of novel nanoporous Ln-MOFs with high catalytic activity through the combination of coplanar clusters and functional ligands. These frameworks exhibit rich active sites and structural advantages, paving the way for the construction of functional Ln-cluster-based nanoporous metal-organic frameworks.
Article
Chemistry, Organic
JIan Xiao, Zhiying Wu, Ziyi Chen, Pengfei Zhao, Chunyan Liu
Summary: The TEPA-PR catalyst efficiently catalyzes Knoevenagel condensation reaction of aromatic aldehydes, yielding a wide range of products in different solvents, and shows good reusability without significant decrease in catalytic activity.
CHINESE JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Samahe Sadjadi, Sara Tarighi, Ali Afshar Ebrahimi
Summary: Two novel composites, composed of MIL-101 and ZSM-5 zeolites with different SiO2/Al2O3 ratios, were synthesized via surface functionalization of ZSM-5 zeolites and subsequent hydrothermal treatment with MIL-101 precursors. These composites demonstrated higher catalytic activity than their individual components in Knoevenagel condensation reaction, indicating the synergism between ZSM-5 and MIL-101. Additionally, the composites showed broad substrate scope, facile catalyst recovery, and high recyclability.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Yan-Fang Zhou, Dan-Ni Yan, Shao-Jun Hu, Li-Peng Zhou, Li-Xuan Cai, Qing-Fu Sun
Summary: Bronsted-base active sites on a Pd4L2 cage enable enhanced catalytic efficiency, wide substrate scope, and high turnover number (TON) for the one-pot photooxidation/Knoevenagel condensation reaction under mild conditions.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Applied
Hongxiao Lv, Zhengguo Zhang, Liming Fan, Yanpeng Gao, Xiutang Zhang
Summary: Heterogeneous MOFs catalysts with both heterogeneity and homogeneity have attracted attention for their efficient combination of easy separation and recyclability, along with active sites and porosity. A Cd2+ and H6TDP self-assembly under acidic solvothermal condition produced a cadmium-organic framework with nano-caged voids and hierarchical microporous channels. After the removal of solvent molecules by activation, the framework exhibited Lewis acid-base sites, making it an excellent recyclable catalyst for cycloaddition reactions and deacetalization-Knoevenagel condensation.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Hongtai Chen, Shurong Liu, Hongxiao Lv, Qi-Pin Qin, Xiutang Zhang
Summary: This study presents a new metal-organic framework, NUC-53, consisting of a binuclear three-dimensional framework with hierarchical micro- and nanoporous channels. The framework exhibits excellent catalytic activity for cycloaddition reactions and deacetalization-Knoevenagel condensation reactions, making it a promising heterogeneous catalyst for various catalytic applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Inorganic & Nuclear
Xiaohu Chen, Yaqin Li, Linhan Jia, Xianglin Yu, Qibiao Wang, Yi Zhang, Zihe Zhang, En Liang, Bin Han, Junbo Li
Summary: This research investigates the catalytic properties of COFs-based heterogeneous catalysts by exploring the effects of nitrogen doping and structural regularity. The results show that nitrogen doping and a regular structure are favorable for the catalysis of Knoevenagel condensation reaction by COFs.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Geert Watson, Parviz Gohari Derakhshandeh, Sara Abednatanzi, Johannes Schmidt, Karen Leus, Pascal Van der Voort
Summary: In this study, a highly N-rich covalent triazine framework (CTF) is utilized as a support for a Ru-III complex, which shows high catalytic performance in selective tandem aerobic oxidation-Knoevenagel condensation reaction. The obtained material not only serves as a catalyst support, but also provides active sites for both aerobic oxidation and Knoevenagel condensation reactions. This work demonstrates a new perspective for developing highly efficient and robust heterogeneous catalysts using CTFs for cascade catalysis.
Article
Chemistry, Physical
Kaihui Ji, Yanan Liu, Yinghua Luo, Xue Zhang, Yufan Bai, Hailong Yue, Pengtao Ma, Jingyang Niu, Jingping Wang
Summary: The development of high-efficiency photocatalysts is of vital importance in solving the problems of low efficiency and harsh conditions in organic oxidation reactions. This study successfully synthesized a novel hybrid polyoxometalate crystal, RuCd-SiW, which showed excellent photocatalytic activity for the selective oxidation of thioanisole under visible light irradiation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Yanan Liu, Jing Wang, Luoning Li, Sha Meng, Kaihui Ji, Pengtao Ma, Jingping Wang, Jingyang Niu
Summary: In this study, the photoinduced Baeyer-Villiger oxidation of cyclohexanone based on the Mukaiyama method was investigated for the first time. A crystalline polyoxometalate-based metal-organic framework photocatalyst, CR-SiW (12), which contains trinuclear ruthenium clusters, was used. The reaction achieved efficient conversion of cyclohexanone to epsilon-caprolactone under visible light irradiation, with a high reaction turnover number and turnover frequency, and a measured apparent quantum yield at 465 nm of 8.4%. The CR-SiW (12) catalyst exhibited high structural stability and reaction reusability.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Baijie Xu, Ruikun Zhao, Zhen Jing, Xinyi Ma, Hui Zhao, Pengtao Ma, Jingping Wang, Jingyang Niu
Summary: Three isomorphic polytungstates have been synthesized and demonstrated excellent catalytic activities in the Knoevenagel condensation reaction. Among them, catalyst 1 showed the highest reactivity, achieving a high reaction yield and TON value.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Mengnan Yang, Huafeng Li, Yao Zhang, Shiyan Ji, Wenjing Chen, Pengtao Ma, Jingping Wang, Jingyang Niu
Summary: A synchronous crystal- and microstructure-dependent strategy was used to synthesize the layered ionic crystal Na5.5H6.5[(SbW9O33)(2){WO2(OH)}(2){WO2}RuC7H3NO4]center dot 36H(2)O with organic hybrid antimoniotungstate. The layered structure consists of Na+ bridged sheets and hydrogen-bonded layers. The crystal displayed proton conductivity of 2.97 x 10(-2) S cm(-1) at 348 K and 75% RH, thanks to the interlayer confined hydrogen-bond network formed by crystal waters, organic ligands, and acidic protons.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Hanhan Chen, Kangting Zheng, Jingru Wang, Bingxue Niu, Jingping Wang, Pengtao Ma, Jingyang Niu
Summary: Two novel arsenotungstate species, [As4W48O168]36- (1a) and [As2W21O77(H2O)3]22- (2a), have been successfully isolated under a one-pot synthetic method. 1a is the second largest arsenotungstate cluster constructed from four {AsW12} clusters combined together. 2a can be described as lacunary sites of {As2W19} filled by {W2O8} units. Compounds 1 and 2 exhibit proton conductivity properties, and the conductivity value of 1 is 5.0 x 10-3 S cm-1 at 98% relative humidity and 75 degrees C. This work proves the participation of lattice water molecules and polyoxoanions in hydrogen bond formation as an effective pathway for intermolecular proton conduction.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Yanan Liu, Luoning Li, Sha Meng, Jing Wang, Qian Xu, Pengtao Ma, Jingping Wang, Jingyang Niu
Summary: Four isomorphic polyoxometalate-based metal-organic frameworks (POMOFs) were synthesized by assembling Rh-2(OAc)(4) and polyoxometalates. The synergistic effect between them enhanced the activities of POMOFs for the photocatalytic oxidative coupling of amines and alkene epoxidation. The development of visible-light-responsive, environmentally friendly, and reusable photocatalysts for organic oxidation reactions is of vital significance.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Siyu Liu, Yuzan He, Xinyi Ma, Jiayu Liu, Pengtao Ma, Jingping Wang, Jingyang Niu
Summary: A high-nuclearity carboxylic-modified heteropolyoxovanadate has been synthesized and shown to be an effective heterogeneous catalyst for the selective oxidation of diphenylmethanes.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Wenjing Chen, Huafeng Li, Yuzhen Jin, Wenjing Lei, Qingyun Bai, Pengtao Ma, Jingping Wang, Jingyang Niu
Summary: Converting solar energy into storable hydrogen energy using green photocatalytic technology is a reliable solution for the energy crisis. Polyoxometalates, with their unique electronic and structural properties, are promising photocatalysts for hydrogen production. Introducing noble metals greatly enhances their photocatalytic efficiency.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Kangting Zheng, Yunfan Zhang, Miao Zhang, Ruiyang Wang, Pengtao Ma, Jingping Wang, Jingyang Niu
Summary: In this paper, a d-methionine-bonded nanosized arsenotungstate with a highly reversible photocoloration property is reported, and it is obtained without the use of bridging lanthanide ions. The polyanion is constituted of two {As2W19O67(H2O)}(14-) building blocks and two {B-β-AsW9O33}(9-) subunits, integrated together by a {W2O4(OH)(d-Met)}(2+) and two {W3O6(H2O)(d-Met)}(5+) subclusters.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Yahao Sun, Huafeng Li, Yan Zou, Pengtao Ma, Jingyang Niu, Jingping Wang
Summary: A novel hexamer of Ru(III)-containing Na16H22[(B-β-SbW9O33)(6)(W3RuO7)(2)(W4O11)]·118H2O (1) with an unusual boat-like cyclohexane conformation displayed good proton conductivity performance, achieving a conductivity (& σ;) of 5.41 x10(-3) S cm(-1) at 333 K and 55% relative humidity (RH) in accordance with the Grotthus mechanism. The hexamer was successfully synthesized using the hydrothermal synthesis method. Single-crystal X-ray diffraction analysis revealed that the polyanion consists of six trivacant Keggin-type [B-β-SbW9O33](9-) units interconnected by six {WO6} and six Ru/W disorder octahedra, resulting in an intriguing cyclohexane boat-like conformation.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Hanhan Chen, Mingyang Zhang, Yuyan Li, Pengtao Ma, Jingping Wang, Jingyang Niu
Summary: The first Fe-implanted polyoxotantalate (POTa) with remarkable proton conduction has been synthesized by self-assembly in alkaline solution. The compound, consisting of six Lindqvist-type {Ta-6} units linked together by {Fe10.7Ta1.3}, possesses the highest nuclearity transition metal-oxygen cluster and the highest degree of polymerization in the POTa field to date.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Huafeng Li, Zelong Yuan, Wenjing Chen, Mengnan Yang, Yahao Sun, Shihao Zhang, Pengtao Ma, Jingping Wang, Jingyang Niu
Summary: Limited studies have been conducted on the synthesis of multifunctional catalysts for the redox reaction path cycle. In this study, two multifunctional Ru-containing polyoxometalate-based photocatalysts were prepared and showed superior catalytic performance. The paper also achieved a closed redox conversion cycle using a single multifunctional catalyst and discussed the relationship between catalytic active site composition and catalytic efficacy, as well as the underlying reaction mechanisms.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Review
Chemistry, Inorganic & Nuclear
Zongfei Yang, Jing Li, Jingyang Niu, Jingping Wang
Summary: Polyoxometalate (POM) chemistry has made significant progress since the discovery of molybdenum blue in 1778, with a particular focus on polyoxotantalates (POTas) in recent years. This review highlights the structural features of various types of POTas and explores their synthesis strategies and applications, especially in photocatalysis. The aim is to provide guidance for the exploration of innovative POTas with unique architectures and excellent performances.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Mengnan Yang, Yao Zhang, Shiyan Ji, Huafeng Li, Xinyi Ma, Yuzhen Jin, Pengtao Ma, Jingping Wang, Jingyang Niu
Summary: A heteropolytungstate cluster was incorporated into a layered porous framework by utilizing the hydrogen bonding ability of the ligands, resulting in a framework with multiple pore channels and high conductivity.
CHEMICAL COMMUNICATIONS
(2023)
Article
Energy & Fuels
Huafeng Li, Wenjing Chen, Yahao Sun, Zelong Yuan, Wenjing Lei, Mengnan Yang, Pengtao Ma, Jingping Wang, Jingyang Niu
Summary: This study demonstrates the successful implementation of Ru oxo cluster-based hybrid materials with electronic interaction and intermolecular hydrogen bonding, showcasing their potential in enhancing photocatalytic activity and selectivity in water splitting reactions.
Article
Chemistry, Physical
Haojie Li, Bingke Yang, Zhen Yao, Xuetao Wang, Kaiming Shen, Mengjie Liu
Summary: This study systematically investigates the influence of metal and nonmetal element doping on the photochemical properties of g-C3N4 for efficient catalytic AB hydrogen production. It provides a design method for high performance bifunctional catalysts of photocatalysis and metal catalysis. The results show that both non-metals (B, P) and metals (Ru, Ni) have efficient regulatory effects on the band structure of g-C3N4, resulting in a reduced band gap and improved hydrogen production. The study offers a theoretical method for the coupling of metal catalysis/photocatalysis ammonia borane to produce hydrogen.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Shrouq Mujahed, Davide Gandolfo, Luigi Vaccaro, Evgueni Kirillov, Dmitri Gelman
Summary: In this study, a high-valent Ru(IV) bifunctional catalyst was successfully applied for the hydrosilylation of various functional groups. The high-valent hydride complexes showed high chemoselectivity and affinity towards reducing polar bonds. The scope, limitations, and plausible mechanism of the reaction were described.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yongzhen Peng, Kongchen Xia, Qi Wu
Summary: In this study, we report an engineered cyclohexanone monooxygenase that can be used for the asymmetric synthesis of chiral alpha-deuterated carbonyl compounds via enantioselective reductive dehalogenation. The engineered enzyme exhibits good chemoselectivity, stereoselectivity, and d-incorporation, making it a promising method for the synthesis of deuterated drugs.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Qi Yang, Ruixuan Xu, Hongqi Nie, Qilong Yan, Jun Liu, Jiuyu Chen, Yunlan Sun
Summary: The adsorption and decomposition processes of ammonium perchlorate (AP) on pure-Al and Al2O3/Al surfaces were investigated using density functional theory. The results showed that the pure-Al surface is more conducive to the decomposition of AP and the activation of NH3, while the Al2O3/Al surface promotes the disengagement of H and NH3 decomposition.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yudong Hu, Guochao Xu, Ye Ni
Summary: This study identified a novel phenylalanine dehydrogenase (QtPDH) with high catalytic efficiency and thermal stability, making it a promising biocatalyst for industrial production of bulky aromatic primary amines. QtPDH exhibited a broader substrate specificity and significantly longer half-life compared to BbPDH.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Weiling Zhao, Zhiling Huang, Hui Shen, Xianglong Li, Shaofen Zhao, Bo Xie, Shengjie Xia
Summary: This study investigated the effects of metal doping and crystal plane selection on the CO2 adsorption properties of MgO using density functional theory (DFT) methods. The results showed that the appropriate crystal plane and metal doping can improve the adsorption properties of MgO on CO2. The influence of different crystal planes and metal dopants on CO2 adsorption properties varied significantly. The research provides some references for experimental studies on CO2 adsorption by MgO by combining the dual modification of crystal plane and doped metal.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Jie Zhang, Jinwei Chen, Zongbo Shi, Junyu Zhao, Runsheng Zhuo, Ruilin Wang
Summary: In this study, a double-layered silicalite-1 support with high specific surface area was synthesized, and a magnesium modification strategy was adopted to improve the catalytic activity and stability of the zinc-based catalyst. The modified catalyst showed enhanced propylene selectivity and anti-coking property.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Pei-Sen Gao, Chang-Wang Pan, Cheng Liu, Wen -Tong Chen
Summary: Asymmetric electrocatalysis offers a unique approach to obtain enantioenriched molecules that are difficult to obtain through conventional methods. This study developed a novel bifunctional electrocatalyst, enabling the oxidative kinetic resolution of chiral 1,4-diols and gamma-lactones. The work demonstrates the potential of bifunctional electrocatalysis for asymmetric synthetic methods and its importance in the development of novel electrocatalytic methods.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Qinzhe Lin, Xuanjin Lv, Xianming Zeng, Mengning Zhong, Qiyun Wu, Huilin Ren, Shenpeng Xu, Wentian Chen, Wenting Du, Jun Li
Summary: The catalytic efficiency of engineered IRED M5 was found to be relatively low when tasked with a bulky amine substrate. Rational design led to the mutants M203V and F260A, with F260A exhibiting a substantial improvement in conversion and stereoselectivity. The study revealed the potential molecular mechanisms underlying the effect of F260A and M203V on catalytic performance.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Zhishuai Wang, Fengyun Su, Hailong Cao, Mengzhen Tian, Xiang Li, Haiquan Xie, Xiaoli Jin, Zhengdao Li, Xin Ying Kong
Summary: In this study, the efficiency of photocatalytic CO2 reduction was significantly enhanced by incorporating nickel oxide onto niobium pentoxide. The resulting catalyst showed remarkable methane and carbon monoxide production improvements.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
A. Yu. Sidorenko, Yu. M. Kurban, T. V. Khalimonyuk, I. V. Il'ina, N. S. Li-Zhulanov, O. S. Patrusheva, V. V. Goltsova, M. P. Bei, Zh. V. Ihnatovich, J. Warna, K. P. Volcho, N. F. Salakhutdinov, D. Yu. Murzin, V. E. Agabekov
Summary: This study provides a comprehensive investigation into the catalytic condensation of renewable 3-carene with formaldehyde for the one-step preparation of terpenoid trans-4-hydroxymethyl-2-carene. Various acids and alumino-silicates were found to catalyze the reaction, but the selectivity to the desired product was limited. Phosphoric acid showed the highest selectivity, and an excess of formaldehyde or catalyst loading significantly increased the yield of the target product. Water presence also led to increased selectivity. Additionally, a detailed mechanism for the 3-carene condensation with formaldehyde was proposed and confirmed through kinetic modeling.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Meng-Yu Rong, Jing Nie, Shen Li, Jun-An Ma
Summary: We synthesized a new class of chiral quaternary ammonium salts and used them as catalysts in phase-transfer catalytic asymmetric alkylation. By employing these catalysts, we obtained a series of chiral fluorinated aromatic alpha-amino acid derivatives with high yields and enantioselectivities.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Zhaozhou Wei, Guangtao Wei, Huixian Che, Deyuan Xiong, Linye Zhang, Ruihua Xue, Yalin Tang, Xuanli Lu
Summary: This study demonstrates that small-sized graphite crystallite and highly defective carbon-based catalysts can increase the -SO3H density of the catalysts and modulate their surface electronic properties, leading to improved efficiency in the alpha-pinene hydration reaction. The reduction of graphite crystallite size is considered a critical step in enhancing the selectivity of alpha-terpineol.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Kempanna S. Kanakikodi, Nagendra Kulal, K. S. Subramanya, M. S. Puneethkumar, Bhavana B. Kulkarni, Ganapati Shanbhag, Sanjeev P. Maradur
Summary: An effective and highly selective protocol for synthesizing asymmetric organic carbonates using dimethyl carbonate (DMC) as a reactant and solvent has been developed. The performance of CeO2 nanostructures with different morphologies in the carbonate interchange reaction (CIR) of alcohols was investigated, and the CeO2 nano-catalyst with rod morphology exhibited the highest oxygen vacancy and remarkable enhancement in conversion. The CeO2 characterization data revealed that the exposed active sites, defect density, coordination state of surface atoms, and reducibility of the catalytic materials are the contributing factors to its high catalytic activity. CeO2 can be easily recovered and reused for multiple cycles.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yanzhao Gao, Xianglei Meng, Shiqi Huang, Hui Wu, Liantao Jiang, Yu Zhou, Yuting Song, Yanyan Diao
Summary: Gamma alumina modified with alkaline earth metal shows improved catalytic performance for hydrogenation reactions. Pd catalysts supported by Al2O3 and Mg-modified Al2O3 were synthesized and their structure, composition, and surface acidity were investigated. The results showed that Pd/MgO-Al2O3-2 catalyst exhibited the best catalytic performance due to its metallic state palladium and weak acid sites.
MOLECULAR CATALYSIS
(2024)