Article
Chemistry, Physical
Alexandra M. Zima, Dmitrii E. Babushkin, Oleg Y. Lyakin, Konstantin P. Bryliakov, Evgenii P. Talsi
Summary: Five iron complexes of the Fe(PDP) family have been screened for the C-H oxidation of a bulky steroidal substrate, showing that the regioselectivity increases with more reactive, low-spin perferryl oxygen-transferring species. Additionally, the C2 hydroxylation chemoselectivity increases with less reactive, high-spin intermediates, suggesting a relationship between reactivity and selectivity in the oxidation process.
Article
Chemistry, Multidisciplinary
Alexandra M. Zima, Oleg Y. Lyakin, Anna A. Bryliakova, Dmitrii E. Babushkin, Konstantin P. Bryliakov, Evgenii P. Talsi
Summary: Catalytic approaches to late-stage creation of new C-O bonds, especially via oxygenation of particular C-H groups in complex organic molecules, provide challenging tools for the synthesis of biologically active compounds and candidate drugs. The key role of the oxygen-transferring high-valent iron-oxygen species in selective oxygenation is now well established. In this Personal Account, recent data on the reactivity of bioinspired formally oxoiron(V) catalytically active sites toward organic substrates having C=C and C(sp(3))-H groups are analyzed, with a focus on the factors governing the oxidation chemo- and stereoselectivity.
Article
Chemistry, Multidisciplinary
Hai-Xu Wang, Liangliang Wu, Bin Zheng, Lili Du, Wai-Pong To, Cheng-Hoi Ko, David Lee Phillips, Chi-Ming Che
Summary: In this study, the hydrogen atom transfer reactivity of an Fe porphyrin nitrido species towards C-H substrates was investigated using nanosecond laser flash photolysis. It was found that C-H bonds with bond dissociation enthalpies of up to approximately 84 kcal mol(-1) could be activated, with second-order rate constants on the order of 10(2)-10(4) s(-1) m(-1). The Fe-amido product formed after hydrogen atom transfer could further release ammonia upon protonation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Rimsha Mehmood, Vyshnavi Vennelakanti, Heather J. Kulik
Summary: Researchers investigate substrate/active-site dynamics of nonheme iron halogenases like BesD and WelO5 using experimental and computational methods, revealing the importance of active-site configurational isomerization for selective halogenation in WelO5. They also find distinct patterns of substrate-protein interactions for these enzymes, and discuss how optimal substrate/active-site geometry plays a crucial role in facilitating chemoselectivity in halogenases. Their work demonstrates different substrate-dependent strategies used to promote selectivity in halogenases.
Review
Chemistry, Inorganic & Nuclear
Yongjun Liu, Ruijia Wang, Christopher K. Russell, Penglong Jia, Yi Yao, Wei Huang, Maciej Radosz, Khaled A. M. Gasem, Hertanto Adidharma, Maohong Fan
Summary: Methane has the potential to be a promising feedstock for clean fuels and chemicals. However, the direct catalytic conversion of methane into oxygenates is a significant challenge. This review summarizes the catalysts for methane synthesis of oxygenates, compares their activities and reaction mechanisms, and highlights potential catalysts and new technologies. Furthermore, future research directions are discussed.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Florian Puls, Felix Seewald, Vadim Grinenko, Hans-Henning Klauss, Hans-Joachim Knoelker
Summary: The study demonstrates the catalytic conversion of olefins to ketones by FePcF16 at room temperature in ethanol under an oxygen atmosphere. By conducting various experiments, the intermediates involved in the oxidation process were identified, leading to a detailed proposed reaction mechanism for the FePcF16-catalyzed Wacker-type oxidation.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Viktoriia M. Zemtsova, Alexandr G. Oshchepkov, Elena R. Savinova
Summary: This study investigates the influence of Fe3+ ions on the alkaline urea oxidation reaction on nickel, revealing that an increased concentration of Fe3+ ions in NaOH has a detrimental effect on the reaction products.
Article
Chemistry, Applied
Zdravko Dzambaski, Aleksandra M. Bondzic, Ierasia Triandafillidi, Christoforos G. Kokotos, Bojan P. Bondzic
Summary: Organic single-electron oxidant in the presence of diarylprolinol silylether type catalyst can transform electron-rich enamines to iminium ions, which then participate in a subsequent Michael-initiated ring-closure reaction with in situ nucleophile to yield stereodefined cyclopropanes from saturated aldehydes. This one-pot transformation exemplifies the use of saturated aldehydes in coupled processes, providing high yields and selectivities.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Chemistry, Physical
Yanjun Wan, Emmanuel Ramirez, Ayzia Ford, Vanessa Bustamante, Gang Li
Summary: The study presents an iron-catalyzed method for accessing gamma-functionalized amides through C-H functionalization, involving the formation of an iron nitrenoid species and a specific mechanism. It demonstrates broad substrate compatibility and practicality, with the catalyst showing high turnovers on complex natural products.
Article
Materials Science, Multidisciplinary
Rene Daniel Puetz, Daniela Zander
Summary: The influence of microstructural changes on the oxidation behavior of Fe-25Al-1.5Ta alloy with carbide additives was investigated at high temperature. The addition of carbides led to selective oxidation and higher oxidation kinetics.
Article
Chemistry, Organic
Marika Di Berto Mancini, Marianna Bernardini, Beniamin Emanuel Birzu, Arianna De Santis, Stefano Di Stefano, Federico Frateloreto, Daria Khaksar, Andrea Lapi, Giorgio Olivo, Osvaldo Lanzalunga
Summary: The chemoselectivity of S-oxidation and hydrogen atom transfer (HAT) from C-H bonds was investigated using the iron(IV)-oxo complex [(N4Py)Fe-IV(O)](2+) and the N-hydroxyphthalimide (NHPI) mediator. Kinetic analyses showed that [(N4Py)Fe-IV(O)](2+) exhibited higher reactivity for S-oxidation, while HAT was favored in the reactions promoted by NHPI oxidation. Product analysis confirmed these results, with sulfoxides being the major products in the oxidation promoted by [(N4Py)Fe-IV(O)](2+), and HAT-derived products being obtained in higher yields when NHPI was used as a mediator.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Energy & Fuels
Yanan Tang, Jinlei Shi, Weiguang Chen, Yi Li, Hao Tian, Yingqi Cui, Zhiwen Wang, Zhen Feng, Xianqi Dai
Summary: This study investigates the adsorption properties and catalytic mechanisms of single-atom transition metal catalysts anchored on H4,4,4- graphyne substrates. The results reveal the differences in reaction rates and mechanisms for NO and CO oxidations on different substrates.
Article
Agricultural Engineering
Misa Mojca Cajnko, Jost Oblak, Miha Grilc, Blaz Likozar
Summary: Enzymes play a crucial role in lignin valorization, with different enzymes involved in various elementary reaction mechanisms. Degradation of lignin depends on enzyme activity and the interaction with proteins in ways that target specific covalent bonds in lignin. Various factors influence enzymatic activity, which must be taken into consideration for optimal functionality and synthesis yields.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Physical
Hasna Aziam, Sylvio Indris, Hicham Ben Youcef, Ralf Witte, Angelina Sarapulova, Helmut Ehrenberg, Ismael Saadoune
Summary: Iron (III) transition metal MFeOPO4@C (M: Co, Ni) oxyphosphates were synthesized and their electrochemical properties were evaluated. The study revealed the active participation of both transition metals M and Fe during the charge and discharge process, and provided insights into the electronic changes of iron upon the first lithiation/delithiation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Carola S. Seelmann, Simona G. Huwiler, Martin Culka, Marc J. F. Strampraad, Till Biskup, Stefan Weber, G. Matthias Ullmann, Volker Schunemann, Peter-Leon Hagedoorn, Antonio J. Pierik, Matthias Boll
Summary: In anaerobic aromatic compound degrading microbes, class II benzoyl-coenzyme A (CoA) reductases (BCRs) reduce benzoyl-CoA to cyclohexa-1,5-diene-1-carboxyl-CoA (1,5-dienoyl-CoA) through a tungsten-bis-metallopterin (MPT) cofactor. This study provides experimental evidence for the Birch-like reduction mechanism via W(V)/radical intermediates and reveals the unique tetrahydro state of MPT cofactors essential for the reversibility of enzymatic Birch reduction.
Review
Chemistry, Inorganic & Nuclear
Danil N. Dybtsev, Konstantin P. Bryliakov
Summary: Researchers summarized the progress in the area of asymmetric catalysis using metal-organic frameworks, highlighting the promising applications of homochiral MOFs in stereoselective catalysis.
COORDINATION CHEMISTRY REVIEWS
(2021)
Review
Chemistry, Applied
Artem A. Antonov, Konstantin P. Bryliakov
Summary: This review surveys recent progress in transition metal catalyzed, metal-free, and electrochemical selective acyloxylations of C(sp3)-H bonds, covering modifications of different substrate types and discussing their synthetic potential, as well as correlations between catalyst nature, oxidant, additives, conditions, and acyloxylation regio- and chemoselectivity.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Alexandra M. Zima, Dmitrii E. Babushkin, Oleg Y. Lyakin, Konstantin P. Bryliakov, Evgenii P. Talsi
Summary: Five iron complexes of the Fe(PDP) family have been screened for the C-H oxidation of a bulky steroidal substrate, showing that the regioselectivity increases with more reactive, low-spin perferryl oxygen-transferring species. Additionally, the C2 hydroxylation chemoselectivity increases with less reactive, high-spin intermediates, suggesting a relationship between reactivity and selectivity in the oxidation process.
Article
Chemistry, Physical
Dmitry P. Lubov, Anna A. Bryliakova, Denis G. Samsonenko, Dmitriy G. Sheven, Evgenii P. Talsi, Konstantin P. Bryliakov
Summary: The mechanistic study involves the direct selective oxidation of benzylic C(sp(3))-H groups using peracetic acid catalyzed by palladium complexes with tripodal amino-tris(pyriylmethyl) ligands. The active species seem to be stabilized by a 2-pyriylmethyl moiety in the catalyst, potentially forming palladium oxyl species as the catalytically active sites. The formation of ketones is proposed to proceed via an O-H abstraction/B-scission mechanism.
Article
Chemistry, Multidisciplinary
Alexandra M. Zima, Oleg Y. Lyakin, Anna A. Bryliakova, Dmitrii E. Babushkin, Konstantin P. Bryliakov, Evgenii P. Talsi
Summary: Catalytic approaches to late-stage creation of new C-O bonds, especially via oxygenation of particular C-H groups in complex organic molecules, provide challenging tools for the synthesis of biologically active compounds and candidate drugs. The key role of the oxygen-transferring high-valent iron-oxygen species in selective oxygenation is now well established. In this Personal Account, recent data on the reactivity of bioinspired formally oxoiron(V) catalytically active sites toward organic substrates having C=C and C(sp(3))-H groups are analyzed, with a focus on the factors governing the oxidation chemo- and stereoselectivity.
Article
Chemistry, Inorganic & Nuclear
Alexander G. Medvedev, Dmitry A. Grishanov, Alexey A. Mikhaylov, Andrei Churakov, Tatiana A. Tripol'skaya, Roman Ottenbacher, Konstantin P. Bryliakov, Alexander Shames, Ovadia Lev, Petr Prikhodchenko
Summary: This article describes the synthesis, transformation, and catalytic application of triphenyllead hydroperoxide. The structure of triphenyllead hydroperoxide is characterized using various spectroscopic techniques, and the photolytic transformation is reported. The use of triphenyllead hydroperoxide as a catalyst in the epoxidation of olefins is also discussed.
INORGANIC CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Varvara A. Drozd, Roman V. Ottenbacher, Konstantin P. Bryliakov
Summary: This study reports the asymmetric epoxidation of a series of olefinic substrates using sodium percarbonate oxidant in the presence of homogeneous catalysts based on Mn complexes with bis-amino-bis-pyridine ligands. The reaction proceeded with high yields and enantioselectivities, using low catalyst loadings. The epoxidation protocol is suitable for various types of substrates.
Review
Chemistry, Applied
Oleg Y. Lyakin, Dmitry S. Bushmin, Evgenii P. Talsi, Konstantin P. Bryliakov
Summary: This review summarizes the recent advances in homogeneous oxidation of hydrocarbon C(sp(3))-H bonds catalyzed by nickel and palladium complexes, and discusses the correlations between the catalyst structure, ligand properties, catalytic conditions, and catalytic reactivity (efficiency, chemoselectivity, and regioselectivity).
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Alexandra M. Zima, Oleg Y. Lyakin, Anna A. Bryliakova, Dmitrii E. Babushkin, Konstantin P. Bryliakov, Evgenii P. Talsi
Summary: The effect of HClO4 on the reactivity and selectivity of catalyst systems based on nonheme iron complexes has been studied. The addition of HClO4 improves the catalytic efficiency and oxidation selectivity, and also increases the reaction rate of key oxygen-transferring intermediates. The effect is attributed to the reversible protonation of the Fe=O moiety.
Article
Chemistry, Inorganic & Nuclear
Pavel A. A. Egorov, Dmitry A. A. Grishanov, Alexander G. G. Medvedev, Andrei V. V. Churakov, Alexey A. A. Mikhaylov, Roman V. V. Ottenbacher, Konstantin P. P. Bryliakov, Maria V. V. Babak, Ovadia Lev, Petr V. V. Prikhodchenko
Summary: This study successfully synthesized and characterized six triaryl and trialkylantimony dihydroperoxides. The crystal structures of these compounds revealed hydrogen-bonded networks formed by hydroperoxo ligands, including infinite hydroperoxo chains. The potential of triphenylantimony dihydroperoxide as a two-electron oxidant in an enantioselective epoxidation reaction was investigated, comparing it with other oxidants.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Dmitry P. Lubov, Mikhail V. Shashkov, Andrey A. Nefedov, Konstantin P. Bryliakov
Summary: This study reports direct oxygenation of nonactivated aliphatic C-(sp(3))-H groups with peroxycarboxylic acids in the presence of palladium tris(pyridylmethyl)amine complex, resulting in hydroxylated derivatives with yields up to 94%. The oxidation of 3 degrees C-H groups shows stereospecificity and the catalyst system is highly sensitive to electronic effects. This suggests potential applications in the regioselective oxidative functionalization of complex molecules of natural origin.
Review
Chemistry, Multidisciplinary
Roman V. Ottenbacher, Anna A. Bryliakova, Vladimir I. Kurganskii, Petr V. Prikhodchenko, Alexander G. Medvedev, Konstantin P. Bryliakov
Summary: In recent years, metalloenzymes-mediated highly selective oxidations of organic substrates under mild conditions have inspired the development of synthetic bioinspired catalyst systems capable of conducting similar processes. Non-heme manganese complexes with certain ligands have proven to be the most effective in these reactions, showing the ability to mediate various chemo- and stereoselective oxidative transformations. Moreover, non-heme Mn based catalysts have become a major platform for studying oxidant activation mechanisms, selective oxygen transfer, and exploring catalytic regioselectivity trends in the oxidation of biologically active substrates.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Roman V. Ottenbacher, Denis G. Samsonenko, Anna A. Bryliakova, Andrey A. Nefedov, Konstantin P. Bryliakov
Summary: This study reports the selective oxidative functionalization of several steroids with a common gonane core by using chiral Mn complexes and H2O2 as the oxidant. Depending on the catalyst's steric demand and chirality, mono-hydroxylation at A, B, or C rings can be achieved with up to 58% yield. The use of hexafluoroisopropanol (HFIP) protects the C17-OH group in one of the steroids, allowing the synthesis of dihydroxy androstane derivatives without the need for protecting groups.
JOURNAL OF CATALYSIS
(2023)
Review
Chemistry, Multidisciplinary
Konstantin P. Bryliakov
Summary: This article surveys milestones in catalytic asymmetric oxidations of organic molecules leading to formation of new C-O or X-O bonds, and discusses existing catalyst systems and the technical and fundamental difficulties in widespread adoption of dioxygen into asymmetric oxygenation catalysis.
MENDELEEV COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Tian Xing, Timothy J. Prior, Mark R. J. Elsegood, Nina V. Semikolenova, Igor E. Soshnikov, Konstantin Bryliakov, Kai Chen, Carl Redshaw
Summary: The synthesis of a series of complexes containing selenophenoxybenzothiazole dyes and their activities in catalyzing ring-opening polymerization reactions were studied. Different structures of complexes were obtained through various chemical reactions, and a positive influence of electron-withdrawing substituents on catalytic activity was observed. These systems showed moderate to good conversions for epsilon-Cl, delta-VL, and co-polymerization, with higher activity observed in the presence of certain electron-withdrawing substituents.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
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)
