Article
Materials Science, Multidisciplinary
Yang Liu, Bin Zhao, Jingyu Liu, Zhongli Wang, Ziqi Liang, Weijia Dong, Chenhui Xu, Bin Wang, Zhuping Fei, Yang Han
Summary: This study investigated the doping effect of various Lewis acid dopants on the conjugated polymer IDT-BT, and found that the oxonium-based dopant had the best air-stability, forming a stable Lewis acid-base adduct. By adjusting the quantity of the dopant, the performance of the (C6H15O)+BF4--doped IDT-BT thin-film transistors was optimized, with improved mobility, reduced threshold voltage, higher on/off ratio, and excellent air-stability due to the additional carriers produced by the stable Lewis acid-base adduct. Notably, the (C6H15O)+BF4--doped device exhibited almost no loss of performance when processed in air. This study demonstrates that increasing the acidity of the dopant can enhance the performance and air stability of Lewis acid-doped polymer and transistor devices.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Luis Werner, Julika Hagn, Janis Walpuski, Udo Radius
Summary: This study synthesized aminoborate complexes using N-heterocyclic carbene ligands and assessed their potential applications in catalytic CO2 conversion.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Dong Guk Nam, Su Yong Shim, Hye-Min Jeong, Do Hyun Ryu
Summary: The highly enantioselective Darzens-type epoxidation of diazoesters with glyoxal derivatives was achieved using a chiral boron-Lewis acid catalyst and a chiral oxazaborolidinium ion catalyst, leading to the asymmetric synthesis of trisubstituted alpha,beta-epoxy esters with high yield (up to 99%) and excellent enantio- and diastereoselectivity (up to >99% ee and >20:1 dr, respectively). The synthetic potential of the method was demonstrated by the conversion of the products to various compounds such as epoxy gamma-butyrolactone, tertiary beta-hydroxy ketone, and epoxy diester.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Review
Chemistry, Inorganic & Nuclear
Erick Lopez, Sophie C. Thorp, Ram S. Mohan
Summary: Despite the limited availability, high cost, and toxicity of transition metal catalysts, they dominate the field of organic synthesis. In recent years, there has been increased interest in the use of catalysts derived from more readily available main group metals. Bismuth(III) compounds have gained popularity in organic synthesis due to their nontoxic nature, relatively low cost, and non-corrosive properties.
Article
Chemistry, Applied
Sergio Fernandez, Javier Santamaria, Alfredo Ballesteros
Summary: This study presents a simple, regioselective and high yielding gold-catalyzed synthesis of benzofulvenes using progargylsilanes and benzophenones as reactants. The silyl moiety synergistically activates the carbonyl compound, and the participation of aluminum trichloride as a cocatalyst clearly increases the gold catalytic activity in the cyclization step. Mechanistic intermediates, including enynes and silylbenzofulvenes, have been isolated, and control experiments confirm the involvement of [LAu][NTf2AlCl3] complex as the true catalyst. The coordination of the Lewis acid to the gold counterion dramatically enhances the gold activity.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Review
Chemistry, Physical
Chenlong Zhang, Weipeng Hu, James P. Morken
Summary: In recent years, a-boryl organometallic reagents have become popular as versatile nucleophiles in asymmetric synthesis, enabling chemo- and stereoselective coupling reactions to produce enantioenriched boronic esters. This allows for efficient construction of complex structures with high functional group compatibility. Efforts have been focused on preparing enantiomerically enriched a-boryl organometallic reagents and developing stereoselective reactions of related racemic materials.
Article
Chemistry, Multidisciplinary
Y. B. N. Tran, Phuong T. K. Nguyen
Summary: A new zinc-based metal-organic framework with high porosity and excellent catalytic activity has been synthesized, showing promising potential in the synthesis of Paal-Knorr N-substituted pyrroles.
Article
Chemistry, Multidisciplinary
Vincent Ming-Yau Leung, Hong-Chai Fabio Wong, Chun-Man Pook, Ying-Lung Steve Tse, Ying-Yeung Yeung
Summary: The use of TOB catalysts increases the interaction between C(sp(3))-H and substrates, providing excellent chemoselectivity in acetalization reactions, particularly in the presence of alcohols and thiols. Experimental and computational studies have shown that TOB catalysts have preorganized C(sp(3))-H structures that stabilize oxyanion intermediates.
Review
Acoustics
Haibo Sun, Pufeng Qin, Yunshan Liang, Yuan Yang, Jiachao Zhang, Jiayin Guo, Xiaolong Hu, Yi Jiang, Yunfei Zhou, Lin Luo, Zhibin Wu
Summary: This review examines the role and influencing factors of ultrasound in the preparation and modification of bismuth-based photocatalysts, as well as its potential applications in contaminants treatment and energy conversion. The mechanism of ultrasound in improving the performance of various types of bismuth-based photocatalysts throughout the process of photocatalysis is deeply analyzed. The future directions and possibilities for ultrasound synergistic bismuth-based photocatalysts are also explored.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Niklas Bormann, Jas S. Ward, Ann Kathrin Bergmann, Paula Wenz, Kari Rissanen, Yiwei Gong, Wolf-Benedikt Hatz, Alexander Burbaum, Florian F. Mulks
Summary: This study reports a scalable, convenient, and inexpensive synthesis of stable diiminium-based reagents and investigates their application in acylation reactions. The adducts formed by coordination with pyridine donors exhibit good Lewis acid properties, allowing efficient conversion of acyl esters to amides and imides.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Wanlong Xiao, Yuhao Mo, Jing Guo, Zhishan Su, Shunxi Dong, Xiaoming Feng
Summary: Chiral macrodiolides with 16, 18, or 20-membered rings were successfully synthesized with high diastereoselectivities and excellent enantioselectivities by adjusting the tether length at the C3 position of indoles. Density functional theory calculations indicated the formation of macrocycles was more favorable than that of 9-membered-ring lactones in terms of kinetics and thermodynamics. The potential utility of these chiral macrodiolide molecules was demonstrated in enantiomeric recognition of aminols and chemical recognition of metal ions.
Article
Chemistry, Physical
Xinyue Hu, Long Chen, Hongye Li, Qifan Xu, Xiaohua Liu, Xiaoming Feng
Summary: Optically enriched Hantzsch dihydropyridines with different ester groups were obtained through asymmetric catalytic cascade reaction. Efficient N,N'-dioxide/NiII or NdIII complex catalysts yielded a variety of products including drugs like nitrendipine, nimodipine, and felodipine, in high yields (up to 99% yield) with excellent enantioselectivities (up to 99% ee). Two enantiomers of the products could be readily obtained via ester group exchange, and axial chiral 4-arylpyridines were also formed through oxidation.
Article
Chemistry, Multidisciplinary
Gina Noh, Erwin Lam, Daniel T. Bregante, Jordan Meyet, Petr Sot, David W. Flaherty, Christophe Coperet
Summary: The presence of Lewis acid sites on Cu nanoparticles supported on tailored supports enhances CH3OH formation rate in CO2 hydrogenation, likely originating from the stabilization of formate and methoxy surface intermediates. The strength of Lewis acid M sites, characterized by pyridine adsorption enthalpies and C-13 chemical shifts of -OCH3 coordinated to M, serves as a molecular descriptor for Lewis acid strength and reactivity in CO2 hydrogenation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Organic
Vladimir B. Kharitonov, Dmitry Muratov, Yulia Nelyubina, Ilya A. Shutkov, Alexey A. Nazarov, Dmitry A. Loginov
Summary: Efficient protocols for the synthesis of triphenylcyclopentadienyl rhodium halides were developed and demonstrated high catalytic activity in the construction of C-C, C-O, and C-N bonds. More than 40 examples of polycyclic organic compounds were successfully synthesized using these protocols, including isocoumarins and naphthalenes, as well as isoquinolinium and dibenzo[a,f]quinolizinium salts.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Xinzhang Lin, Junying Zhang, Jie Tang, Yang Yang, Chao Liu, Jiahui Huang
Summary: Atomically precise metal complexes, such as the Pt-2(S-Adam)(4)(PPh3)(2) complexes synthesized in this study, play a crucial role in controlled synthesis and catalytic applications. The crystal structure analysis revealed various packing modes of these complexes, and their UV-visible absorption spectra showed distinct absorption peaks. Moreover, these Pt complexes demonstrated high catalytic activity and selectivity in the propane dehydrogenation reaction.
Article
Chemistry, Physical
Dai Wei-Li, Jin Bi, Luo Sheng-Lian, Luo Xu-Biao, Tu Xin-Man, Au Chak-Tong
APPLIED CATALYSIS A-GENERAL
(2014)
Article
Chemistry, Physical
Jian-Ping Zou, Si-Liang Lei, Jian Yu, Sheng-Lian Luo, Xu-Biao Luo, Xing-Hua Tang, Wei-Li Dai, Jing Sun, Guo-Cong Guo, Chak-Tong Au
APPLIED CATALYSIS B-ENVIRONMENTAL
(2014)
Article
Chemistry, Physical
Bin Guo, Fang Deng, Yu Zhao, Xubiao Luo, Shenglian Luo, Chaktong Au
APPLIED SURFACE SCIENCE
(2014)
Article
Chemistry, Physical
Yi-Qiang Deng, Teng Zhang, Chak-Tong Au, Shuang-Feng Yin
CATALYSIS COMMUNICATIONS
(2014)
Article
Chemistry, Applied
Chuan Shi, Shaohua Zhang, Xiaosong Li, Anjie Zhang, Ming Shi, Yongjun Zhu, Jieshan Qiu, Chaktong Au
Article
Engineering, Environmental
Teng Zhang, Yi-Qiang Deng, Wei-Fang Zhou, Chak-Tong Au, Shuang-Feng Yin
CHEMICAL ENGINEERING JOURNAL
(2014)
Review
Physics, Multidisciplinary
Zhong Wei, Au Chak-Tong, Du You-Wei
Article
Engineering, Environmental
Xubiao Luo, Fang Deng, Lujuan Min, Shenglian Luo, Bin Guo, Guisheng Zeng, Chaktong Au
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2013)
Article
Chemistry, Inorganic & Nuclear
Lang Chen, Rui Huang, Miao Xiong, Qing Yuan, Jie He, Jing Jia, Meng-Yuan Yao, Sheng-Lian Luo, Chak-Tong Au, Shuang-Feng Yin
INORGANIC CHEMISTRY
(2013)
Article
Chemistry, Multidisciplinary
Junfeng Zhang, Xinzhen Feng, Yuling Zhao, Weijie Ji, Chak-Tong Au
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2014)
Article
Chemistry, Organic
Xiuling Chen, Tieqiao Chen, Yongbo Zhou, Chak-Tong Au, Li-Biao Han, Shuang-Feng Yin
ORGANIC & BIOMOLECULAR CHEMISTRY
(2014)
Article
Chemistry, Physical
Dai Wei-Li, Jin Bi, Luo Sheng-Lian, Luo Xu-Biao, Tu Xin-Man, Au Chak-Tong
CATALYSIS SCIENCE & TECHNOLOGY
(2014)
Article
Chemistry, Multidisciplinary
Jin Zhao, Jun Xie, Chak-Tong Au, Shuang-Feng Yin
Article
Nanoscience & Nanotechnology
Qian Ding, Xueyin Song, Xiujuan Yao, Xiaosi Qi, Chak-Tong Au, Wei Zhong, Youwei Du
NANOSCALE RESEARCH LETTERS
(2013)
Article
Chemistry, Applied
Jun Ni, Zhenni Tan, Qianjin Sai, Jie Zhu, Xiuyun Wang, Bingyu Lin, Jianxin Lin, Chak-tong Au, Lilong Jiang
Summary: A new strategy has been developed to confine Ru and/or Co nanoparticles in the channels of N-doped carbon using benzoic acid, which results in a catalyst with high resistance against Ru sintering, showing excellent activity and long term stability for NH3 synthesis. This study provides a new avenue for simple fabrication of precious-metal-based catalysts that are highly resistant against sintering, specifically suitable for low-temperature synthesis of ammonia with outstanding efficiency.
JOURNAL OF ENERGY CHEMISTRY
(2021)