Article
Chemistry, Organic
Sylwia Sowa, K. Michal Pietrusiewicz
Summary: A new method for reduction of tertiary phosphine oxides leading to the formation of tertiary phosphine-boranes has been developed, with good to high yields. The reaction is highly stereoselective and retains configuration at the phosphorus atom without the need for activating groups in the starting material structure. A plausible mechanism of reduction of the P=O bond by BH3-THF/Ti(Oi-Pr)(4) has been proposed.
Article
Chemistry, Organic
Nastassia Varabyeva, Maryia Barysevich, Yauhen Aniskevich, Alaksiej Hurski
Summary: Cyclopropanols, readily available from esters or ketones, undergo diverse ring-opening transformations and can serve as a coupling partner in dual photoredox and nickel-catalyzed reactions. By using the Ti(OiPr)(4) additive, elusive cross-coupling with aryl and alkenyl bromides leading to beta-substituted ketones can be achieved.
Article
Chemistry, Organic
Shouang Lan, Rui Liu, Xiangwen Kong, Jinggong Liu, Benlong Luo, Shuang Yang, Xinqiang Fang
Summary: A unique deoxygenative cyclodimerization of alkynyl 1,2-diketones facilitated by Ti((OPr)-Pr-i) (4) has been achieved, resulting in a series of highly functionalized furan products. Unusual C-C and C=O bond cleavage of the substrates is observed, with Ti(OiPr)(4) playing triplicate roles in the reaction. Furthermore, the products exhibit uncommon fluorescent emission in the solid state, indicating potential practical applications of this work.
Article
Engineering, Chemical
Yu Gaoa, Zhitao Han, Guangpeng Zhai, Liguo Song, Jingming Dong, Shaolong Yang, Xinxiang Pan
Summary: This study synthesized MnTiOx catalyst by partially replacing Mn with Ce, and found that the substitution of Mn with Ce could significantly improve the N-2 selectivity and widen the operating temperature window of the catalyst. The substitution also influenced the redox property and surface acidity of the catalyst, promoting N-2 formation and effectively restraining N2O formation in NH3-SCR reaction.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Chemistry, Organic
Quan Lin, Weiqi Tong, Yunrong Chen, Xing-Zhong Shu
Summary: This study reports a Ti-catalyzed direct dehydroxylation of tertiary aliphatic alcohols under mild reaction conditions, resulting in the formation of Barton-type deoxygenation products. The method is tolerant to a wide range of functional groups, including primary alkyl chloride and carbonyl groups. It allows for selective dehydroxylation of tertiary alcohols in diols and the formation of deuterated products with moderate deuterium incorporation. The efficient modification of several drugs and natural products highlights the synthetic utility of this method.
Article
Chemistry, Multidisciplinary
Robin Rothfelder, Verena Streitferdt, Ulrich Lennert, Jose Cammarata, Daniel J. Scott, Kirsten Zeitler, Ruth M. Gschwind, Robert Wolf
Summary: Detailed P-31{H-1} NMR spectroscopic investigations provide deeper insight into the mechanisms involved in the photocatalytic arylation of white phosphorus, revealing previously unrecognized side products and the unexpected behavior of the terminal reductant Et3N. The different rate of formation of these products explains the performance discrepancies of two effective catalysts, while the observation of PH3 as a minor intermediate led to the development of a new catalytic procedure for the arylation of white phosphorus. This method yields valuable triarylphosphines or tetraarylphosphonium salts depending on aryl substituents' steric profiles.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Engineering, Environmental
Ao Qian, Yuxi Lu, Yanting Zhang, Chenglong Yu, Peng Zhang, Wenjuan Liao, Yao Yao, Yunsong Zheng, Man Tong, Songhu Yuan
Summary: Electron transfer is the essence of biogeochemical processes related to element cycling and contaminant attenuation, and this study explored the electron transfer between reduced nontronite and Fe-(hydr)-oxides. The results showed that electron transfer occurred mainly through the mineral-mineral interface, with a negligible contribution from dissolved Fe2+/Fe3+. The study suggests that the mineral-mineral electron transfer could play an important role in subsurface biogeochemical processes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Chemical
Xiru Chen, Changyin Zhu, Fengxiao Zhu, Guodong Fang, Dongmei Zhou
Summary: Sulfite combined with UV light has been found to efficiently degrade diethyl phthalate (DEP) under aerobic conditions. The study indicates that oxidative radicals, hydrated electron, and hydrogen atom are generated in the sulfite/UV system. Hydrogen atom is the dominant reactive species for DEP degradation. Ethanol and tert-butyl alcohol can promote DEP degradation by quenching the reaction of oxidative radicals. Solution pH and the presence of humic acid greatly affect DEP degradation. It is suggested that H-center dot generated during sulfite/UV process plays an important role in pollutant degradation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Energy & Fuels
Xiangchen Kong, Chao Liu, Yue Han, Ming Lei, Yuyang Fan, Ming Li, Rui Xiao
Summary: A low-cost Cu/CuMgAlOx catalyst was used for lignin hydrodeoxygenation (HDO) in supercritical methanol, showing high efficiency. The study established a detailed reaction network and paved the way for the catalyst's application in upgrading lignin derivatives.
Article
Chemistry, Multidisciplinary
Andreas M. Reichert, Oriol Pique, Walter A. Parada, Ioannis Katsounaros, Federico Calle-Vallejo
Summary: In the electrochemical CO2 reduction reaction, glyoxal is found not to be a significant intermediate in the pathways towards ethylene or ethanol on copper electrodes. Selective and low-temperature production of ethylene glycol is shown to be possible on different active sites. This study provides new directions for the electrification of chemical processes at refineries, in addition to mechanistic insights into CO2RR.
Article
Chemistry, Physical
Courtney Brea, Guoxiang Hu
Summary: Incorporating a second transition metal to Fe-N-C SACs to design DMSCs can enhance the ORR. However, the structure-property relationship at the atomic level is challenging to elucidate due to the many possible structural configurations and dynamic structure evolution. In this study, a computational workflow is developed to understand the active site structures and catalytic mechanisms of ORR on Fe-Cu DMSCs. The results provide insights into the rational design of efficient platinum group metal-free DMSCs for ORR.
Article
Chemistry, Multidisciplinary
Sven Roediger, Sebastian U. Leutenegger, Bill Morandi
Summary: We present a strategy that allows for the direct substitution of tertiary phosphines. This method enables the introduction of various alkyl substituents into phosphorus-based compounds, providing a faster route for the synthesis of parent ligand derivatives.
Article
Chemistry, Multidisciplinary
Aditya Bhattacharya, Pushpendra Mani Shukla, Biswajit Maji
Summary: A highly chemoselective C-N bond cleavage reaction of p-methoxybenzyl- (PMB), 3,4-dimethoxybenzyl(DMB), or cinnamyl-substituted tertiary sulfonamides in the presence of catalytic Bi(OTf)(3) has been successfully demonstrated, resulting in good to excellent yields of the corresponding products. Insights into the reaction mechanism have been obtained through a series of control experiments and mass spectroscopy.
Article
Chemistry, Multidisciplinary
Yi Li, Weitao Shan, Michael J. Zachman, Maoyu Wang, Sooyeon Hwang, Hassina Tabassum, Juan Yang, Xiaoxuan Yang, Stavros Karakalos, Zhenxing Feng, Guofeng Wang, Gang Wu
Summary: By designing dual-metal active sites, the coordination environments of M-N-C catalysts can be expanded. The Ni-Fe catalyst exhibits the most efficient CO2RR activity and promising stability compared to other combinations. This study provides a new approach to improve the activity and selectivity of the CO2 reduction reaction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Organic
Rebeca Martinez-Haya, Adrian A. Heredia, Willber D. Castro-Godoy, Luciana C. Schmidt, M. Luisa Marin, Juan E. Arguello
Summary: The study successfully combined transition-metal catalysis and photoredox catalysis to form the light-triggered CuAAC reaction. Depending on the choice of photocatalysts and additives, the reaction could have drastically different outcomes. Through experiments to determine reactivity and kinetic data, the proposed mechanisms were supported and the importance of kinetic studies in understanding photoredox processes was highlighted.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Engineering, Chemical
Alain Favre-Reguillon, Micheline Draye, Gerard Cote, Kenneth R. Czerwinsky
SEPARATION AND PURIFICATION TECHNOLOGY
(2019)
Article
Chemistry, Physical
R. Castro Contreras, B. Guicheret, B. F. Machado, C. Rivera-Carcamo, M. A. Curiel Alvarez, B. Valdez Salas, M. Ruttert, T. Placke, A. Favre Reguillon, L. Vanoye, C. de Bellefon, R. Philippe, P. Serp
JOURNAL OF CATALYSIS
(2019)
Article
Chemistry, Physical
Laurent Vanoye, Ahmad Hammoud, Helene Gerard, Alexandra Barnes, Regis Philippe, Pascal Fongarland, Claude de Bellefon, Alain Favre-Reguillon
Article
Chemistry, Organic
Laurent Vanoye, Mohamed Abdelaal, Kacy Grundhauser, Boris Guicheret, Pascal Fongarland, Claude De Bellefon, Alain Favre-Reguillon
Article
Chemistry, Multidisciplinary
Boris Guicheret, Eric Da Silva, Regis Philippe, Alain Favre-Reguillon, Laurent Vanoye, Philippe Blach, Yann Raoul, Claude De Bellefon, Estelle Metay, Marc Lemaire
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2020)
Article
Chemistry, Applied
Laurent Vanoye, Alain Favre-Reguillon
Summary: This study further investigated the liquid-phase oxidation reaction and demonstrated the pivotal role of acylperoxy radical, while pointing out that the commonly accepted oxidation pathway may be overlooked.
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2022)
Article
Engineering, Environmental
Laurent Vanoye, Boris Guicheret, Camila Rivera-Carcamo, Ruben Castro Contreras, Claude de Bellefon, Valerie Meille, Philippe Serp, Regis Philippe, Alain Favre-Reguillon
Summary: A process intensification study for the full hydrogenation of bio-derived platform molecule squalene (SQE) into squalane (SQA) using commercial heterogeneous Pd catalysts and Pd supported on carbon nanotubes (CNT) is reported. The study found that Pd/CNT catalyst showed improved catalytic activity for the hydrogenation reaction, but the scalability and operability of the stirred reactor were limited due to the exothermic nature of the reaction. The implementation of the Pd/CNT catalyst in a flow reactor coated on metallic open cell foams allowed for efficient and scalable production of SQA.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Boris Guicheret, Laurent Vanoye, Camila Rivera-Carcamo, Claude de Bellefon, Philippe Serp, Regis Philippe, Alain Favre-Reguillon
Summary: A newly developed catalyst with high activity and stability in liquid phase hydrogenation of terpenes has been reported, showing promise for commercial applications in continuous flow processes.
Letter
Chemistry, Multidisciplinary
Alain Favre-Reguillon
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Laurent Vanoye, Alain Favre-Reguillon
Summary: The accumulation of peracids during the aerobic oxidation of aldehydes is a safety and selectivity concern in both laboratory and industrial applications. The quantification and conversion of peracids into carboxylic acids are of vital importance. The addition of carboxylate salts catalyzed the selective transformation of peracids into carboxylic acids, improving the selectivity of the oxidation without decreasing the reaction rate. This methodology prevents the build-up of peracids, enhancing the safety of the process.
REACTION CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Jeremy Audevard, Javier Navarro-Ruiz, Vincent Bernardin, Yann Tison, Anna Corrias, Iker Del Rosal, Alain Favre-Reguillon, Regis Philippe, Iann C. Gerber, Philippe Serp
Summary: Pd/C catalysts are widely used in hydrogenation reactions, with Pd nanoparticles promoting H-spillover. However, in selective hydrogenation, unpromoted Pd/C catalysts are not effective. Pd single atom catalysts, although selective, have low activity. By utilizing a cooperative catalysis between Pd nanoparticles and Pd single atoms, high selectivity and activity can be achieved.
Article
Chemistry, Physical
C. Rivera-Carcamo, I. C. Gerber, I. del Rosal, B. Guicheret, R. Castro Contreras, L. Vanoye, A. Favre-Reguillon, B. F. Machado, J. Audevard, C. de Bellefon, R. Philippe, P. Serp
Summary: This study reveals a structure/activity correlation in Pd/C catalysts for alkene hydrogenation, showing that highly dispersed Pd nanoparticles, surface defects, and oxygenated groups on the support play crucial roles in the catalytic process. A combination of these structural characteristics allows cooperative catalysis between Pd-NP and Pd-SA, leading to the formation of highly active Pd-SA-H species for alkene hydrogenation and isomerization. Additionally, an efficient method to control the ratio between Pd-SA and Pd-NP in Pd/C catalysts has been developed, enabling the design of stable and highly active catalysts with a rational use of precious metals.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Leo Violet, Alexis Mifleur, Laurent Vanoye, Duc Hanh Nguyen, Alain Favre-Reguillon, Regis Philippe, Regis M. Gauvin, Pascal Fongarland
REACTION CHEMISTRY & ENGINEERING
(2019)
Article
Chemistry, Physical
Zine Eddine Hamami, Laurent Vanoye, Pascal Fongarland, Claude de Bellefon, Alain Favre-Reguillon
Article
Chemistry, Multidisciplinary
Julien Sofack Kreutzer, Laurent Vanoye, Boris Guicheret, Regis Philippe, Estelle Metay, Marie-Christine Duclos, Marc Lemaire, Claude De Bellefon, Pascal Fongarland, Alain Favre-Reguillon
REACTION CHEMISTRY & ENGINEERING
(2019)
