Article
Chemistry, Multidisciplinary
Weijin Wang, Xiaoxue Yang, Rongheng Dai, Zixi Yan, Jialiang Wei, Xiaodong Dou, Xu Qiu, Hongliang Zhang, Chen Wang, Yameng Liu, Song Song, Ning Jiao
Summary: The electrophilic halogenation of arenes is a common method to prepare aryl halides, but reactions of arenes with electron-withdrawing substituents usually require harsh conditions and have limited substrate scopes. This study describes a mild protocol for the halogenation of arenes with electron-withdrawing substituents catalyzed by Bronsted acid, providing an efficient method for the synthesis of aryl halides.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Yi Qi, Xin Xiao, Yuqing Mei, Lingyingzi Xiong, Liheng Chen, Xuliang Lin, Zhan Lin, Shirong Sun, Bing Han, Dongjie Yang, Yanlin Qin, Xueqing Qiu
Summary: This paper presents a new strategy to tune the active sites of catalysts for the selective cleavage of lignin to produce aromatic monomers. The authors achieved this by adjusting the non-stoichiometric ratio of nickel and cobalt. The optimized Ni0.2Co2.8O4 catalysts showed outstanding catalytic conversion and selectivity for lignin cleavage.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Serguei Alejandro-Martin, Hector Valdes, Claudio A. Zaror
Summary: Catalytic ozonation using zeolite is an effective method to eliminate VOCs, with experimental evidence suggesting that ozone is adsorbed and decomposed at Lewis acid sites, forming active atomic oxygen that leads to the oxidation of adsorbed toluene at Bronsted acid sites.
Article
Chemistry, Multidisciplinary
Heekyoung Choi, Soichiro Ogi, Naoki Ando, Shigehiro Yamaguchi
Summary: This study reports kinetically controlled supramolecular polymerization of boron-containing p-conjugated molecules using a seeding method based on dual trapping of a metastable state. The formation of helical supramolecular nanostructures with intense J-type aggregate emission was achieved through cooperative supramolecular polymerization. The presence of a Lewis acid-base complex enhanced the stabilization of the metastable monomeric state, allowing for successful production of homogeneous nanofibers even at high concentrations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Fei Han, Han Sun, Zhenchao Zhao, Yaxin Xu, Hong Dong, Weiwei Liu, Lu Sun, Zhili Wang, Guangjin Hou, Masaaki Kitano, Wei Li, Meiqing Shen, Haijun Chen
Summary: In this study, an environmentally friendly deNO(x) method using methanol as a reductant and pure H-FER zeolite as the catalyst was proposed. The metal-free zeolite showed nearly 4 times higher activity compared to commonly used precious metal catalysts. It exhibited comparable deNO(x) efficiency with state-of-the-art NH3-SCR on vanadium-based catalysts, along with good stability and potential for industrial application.
Article
Energy & Fuels
Xiatian Tian, Benkun Qi, Shaofeng Zhang, Jianquan Luo, Yinhua Wan
Summary: The study found that Lewis acid AlCl3 is effective in catalyzing the conversion of sucrose to HMF, and combining it with different Bronsted acids or changing the Lewis acid/Bronsted acid ratio can shorten the time required to reach maximum HMF yield. In the green reaction media of GVL solvent, sucrose conversion resulted in comparable HMF yields to the DSMO-water system. The addition of NaCl and Na2SO4 had opposite effects on HMF production.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Article
Chemistry, Physical
Tingting Yan, Mengting Zhang, Runze Liu, Weili Dai, Naijia Guan, Landong Li
Summary: The selective conversion of the acetone-butanol-ethanol (ABE) mixture to high-valuable chemicals is still challenging. In this study, a bifunctional Ga/HZSM-5 zeolite catalyst containing both Bri nsted acid sites and Lewis acid sites was designed and used for the conversion of the ABE mixture to aromatics, achieving a state-of-the-art aromatics yield of 77%. The mechanisms of aromatics formation and catalyst deactivation were investigated, and a synergistic catalysis between Lewis acidic Ga species and Bri nsted acid sites was proposed.
Review
Chemistry, Physical
Hugo Santos, Lucas A. Zeoly, Manoel T. Rodrigues Jr, Fabio S. Fernandes, Ralph C. Gomes, Wanda P. Almeida, Fernando Coelho
Summary: Since its discovery in the late 1960s, the Morita-Baylis-Hillman (MBH) reaction has been a powerful carbon-carbon sigma-bond-forming reaction, producing small polyfunctionalized molecules. Advances in functional catalysts and reaction conditions have been made to improve the reaction rate, substrate scope, and enantioselectivity. This review provides an updated summary of the main improvements in catalytic systems for the MBH reaction over the past decade until nowadays, aiming to inspire further investigations and overcome the remaining challenges of this fascinating transformation.
Article
Chemistry, Physical
Dai-Yu Li, Rui-Mu Yu, Jin-Ping Li, Deng-Feng Yang, Qi Pang, Hong-Liang Li
Summary: This article describes an improved para-selective C(sp(2))-H borylation of anisole derivatives. The selective borylation is likely to be influenced by the change in electron density on the aromatic ring when a Lewis acid coordinates with an anisole substrate. In addition, the use of a sterically hindered bipyridyl ligand in the reaction also promotes para-selectivity. This strategy has demonstrated a significant improvement in the ratio of para-borylated products, with the reaction taking place at milder temperatures and most substrates displaying moderate to good site-selectivity.
Article
Chemistry, Applied
Nattaphon Hongrutai, Sutasinee Watmanee, Tanaya Srisakwattana, Sippakorn Wannakao, Piyasan Praserthdam, Joongjai Panpranot
Summary: The propene self-metathesis and the secondary metathesis of 1-butene over tungsten-based catalysts supported on silica and 1%Al-doped SiO2 were investigated. Incorporating WOx improved tungsten dispersion and formation of active tetrahedral WOx species on pure SiO2, while negative effects were observed when tungsten was incorporated in the 1%Al-doped SiO2. The abundance of Bronsted and Lewis acid species was found to be more important than surface silanol and the presence of tetrahedral tungsten oxide species in these reactions.
Article
Chemistry, Multidisciplinary
N. Hongrutai, S. Watmanee, S. Wannakao, P. Praserthdam, J. Panpranot
Summary: In this study, the surface silanol structures, acid properties, and tungsten dispersion of sol-gel-derived 7W/SiO2-xAl2O3 catalyst were investigated using various analytical techniques. The addition of 1 wt% Al2O3 was found to effectively preserve the Si(OH)Al structure, leading to the best catalytic performance in propene self-metathesis reaction.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Chemistry, Organic
Erwan Galardon
Summary: The activation of 8-quinolinethiosulfonates by zinc chloride enables the C3-alkylsulfenylation of indoles at room temperature under aerobic conditions, which is compatible with substrates containing various functional groups.
TETRAHEDRON LETTERS
(2021)
Article
Energy & Fuels
Chi Zhang, Yubei Lan, Yijia Cao, Shengwei Tang, Yunfa Chen, Wenxiang Tang
Summary: Rational modulation of surface electronic structure through low-valence Mg doping strategy enhances the activity and stability of Co-Mn binary oxide (CMO) catalyst for hydrocarbon combustion. The introduction of Lewis acid sites and oxygen vacancies promotes the process of propane dissociative adsorption and mineralization. This work provides insight into the role of Mg dopants in boosting C-H activation and offers a potential strategy for fabricating highly active hydrocarbon combustion catalysts.
Article
Chemistry, Multidisciplinary
Min-Jae Kim, Jae-Rang Youn, Seung-Jae Lee, In-Soo Ryu, Sung Chan Nam, Soon Kwan Jeong, Sang Goo Jeon
Summary: In this study, the surface properties and performance of CeO2-promoted Mn/TiO2 catalysts in the low-temperature selective catalytic reduction (SCR) of NO by NH3 were investigated by changing the impregnation sequence of Mn and Ce. The results showed that the co-impregnated catalyst had higher NO conversion and improved metal dispersion, providing more adsorption sites. Additionally, the acidity of the catalyst could be controlled by changing the synthesis method.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Yajuan Li, Cuijie Han, Yanyan Wang, Xin Huang, Xiaowei Zhao, Baokun Qiao, Zhiyong Jiang
Summary: Visible-light-driven photocatalytic reductive azaarylation is widely used for the construction of imine-containing azaarene derivatives. Although efficient methods have been established, enantioselective reactions remain a challenge. This study demonstrates the feasibility of chiral hydrogen-bonding/photosensitizer catalysis for achieving enantioselective reductive azaarylation, leading to valuable enantioenriched azaarene variants.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Organic
Sean M. Maddox, Christopher J. Nalbandian, Davis E. Smith, Jeffrey L. Gustafson
Review
Chemistry, Organic
Oana R. Luca, Jeffrey L. Gustafson, Sean M. Maddox, Aidan Q. Fenwick, Daryl C. Smith
ORGANIC CHEMISTRY FRONTIERS
(2015)
Editorial Material
Chemistry, Medicinal
Sean Maddox, David Hecht, Jeffrey L. Gustafson
FUTURE MEDICINAL CHEMISTRY
(2016)
Article
Chemistry, Organic
Sean M. Maddox, Andrew N. Dinh, Felipe Armenta, Joann Um, Jeffrey L. Gustafson
Article
Chemistry, Organic
Mariel M. Cardenas, Sean T. Toenjes, Christopher J. Nalbandian, Jeffrey L. Gustafson
Article
Chemistry, Physical
Sean M. Maddox, Gregory A. Dawson, Nicholas C. Rochester, Arianna B. Ayonon, Curtis E. Moore, Arnold L. Rheingold, Jeffrey L. Gustafson
Article
Chemistry, Organic
Andrew N. Dinh, Ryan R. Noorbehesht, Sean T. Toenjes, Amy C. Jackson, Mirza A. Saputra, Sean M. Maddox, Jeffrey L. Gustafson
Meeting Abstract
Chemistry, Multidisciplinary
Sean Toenjes, Valeria Garcia, Sean Maddox, Gregory Dawson, Maria Ortiz, Javier Piedrafita, Jeffery Gustafson
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)
