Article
Chemistry, Multidisciplinary
Yasunori Toda, Airi Kooguchi, Kimiya Sukegawa, Ayaka Kikuchi, Hiroyuki Suga
Summary: In this study, conformationally stable rotational isomers were designed around the C(sp(2))-C(sp(3)) axis at the C-3 position of hexahydro-1,2,4,5-tetrazines, and isolation of each rotamer was successfully achieved using silica gel column chromatography at room temperature. The proposed isomerization mechanism of the rotamers was supported by NMR kinetic studies.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Sabine Bognar, Manuel van Gemmeren
Summary: A synthetically simple general one-step protocol was developed for the selective synthesis of a broad range of unsymmetrical dithioacetals consisting of one aromatic and one aliphatic thiol moiety. The mixed S,S-acetals were obtained in high yields, demonstrating excellent selectivity.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Eva Bokor, Dora T. Kecskes, Ferenc Gombas, Alexandra Feher, Eszter Kardos, Akram Dabian, Zsofia Vonza, Eszter Szennyes, Laszlo Somsak
Summary: This paper investigates the synthesis of C-glycopyranosyl tetrazines and their application in various reactions.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Multidisciplinary Sciences
Aisha Y. Hassan, Sara N. Shabaan, Samiha A. El-Sebaey, Eman S. Abou-Amra
Summary: In this study, various novel nitrogen-rich heterocycles were designed in one molecule. Green, simple, and efficient aza-annulations were developed under solvent-free conditions using a versatile building block, resulting in the synthesis of bridgehead tetrazines and azepines. The protocol allows for the synthesis of essential biological derivatives without the need for catalysis, with high yields and functional group tolerance.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Applied
Elisabeth L. R. Leonard, Geoffrey R. Akien, Thomas K. Britten, Nahin Kazi, Dean D. Roberts, Mark G. Mclaughlin
Summary: A rapid method for synthesizing functionalized allylsilanes from easily available vinylsilanes was presented. The key step involved Bronsted acid catalyzed dehydration, resulting in good yields (22-98%) of allylsilanes, mostly as a single geometric isomer. Additionally, a possible allylation-Cope pathway was discovered for certain substrates and attempts to optimize it were described.
ADVANCED SYNTHESIS & CATALYSIS
(2023)
Article
Chemistry, Applied
Teling Xu, Shanshan Huang, Linbo Tan, Xueyan Zhang, Wengao Jiang, Juan Luo, Qiang Tang
Summary: A method for synthesizing various symmetrical and unsymmetrical indolo[2,3-a]carbazoles has been developed, using alpha-haloketones and indoles in a one- or two-step reaction. The methodology demonstrated controllable selectivity and the ability for large-scale synthesis. It was also compatible with other alpha-functionalized ketones, allowing for the formation of corresponding indolocarbazoles. Additionally, all the indolo[2,3-a]carbazoles exhibited dual fluorescence, with the intensity varying depending on the solvent.
ADVANCED SYNTHESIS & CATALYSIS
(2023)
Article
Chemistry, Physical
Jeremy D. Griffin, David B. Vogt, J. Du Bois, Matthew S. Sigman
Summary: This study presents a straightforward C-H oxidation protocol using an acid-stable, bis(bipyridine)Ru catalyst. It reveals that electronic differences remote to the C-H functionalization site affect product selectivity, and the choice of reaction solvent also plays a role in determining site-selectivity. A statistical model is detailed to correlate product selectivity outcomes with computational parameters describing the relative electron-richness of C-H bonds.
Article
Chemistry, Organic
Florian Sachse, Christoph Schneider
Summary: A cooperative, one-pot approach has been developed for the in situ generation and subsequent cycloaddition of thioaldehydes and ortho-quinone methides under UV-A light and Brønsted acid catalysis, providing direct access to benzo[e][1,3]oxathiines in good to excellent yields and diastereoselectivity. Both electron-rich and electron-poor thioaldehydes can easily react with a wide range of ortho-quinone methides at ambient temperature in a short reaction time, producing a variety of S,O-heterocycles.
Article
Chemistry, Organic
Tao Zhou, Ling-Jie Fan, Zi-Jia Chen, Meng-Xue Jiang, Pu-Fan Qian, Xinquan Hu, Kun Zhang, Bing-Feng Shi
Summary: In this study, we describe the preparation of various structurally diverse P-stereogenic phosphinamides through Pd(II)-catalyzed enantioselective C-H alkynylation using cheap commercially available l-pyroglutamic acid as a chiral ligand. The reactions showed good yields and high enantioselectivities via desymmetrization and kinetic resolution. The presence of a tailor-made congested directing group, N-ethyl-N-(3-methylpyridin-2-yl)amino, was crucial for the reactivity.
Article
Chemistry, Organic
Martin Kamlar, Ivana Cisarova, Jan Vesely
Summary: A Bronsted acid-catalyzed synthesis of tetrasubstituted allenyl compounds decorated with heterocyclic sulfenyl group is reported in this study. The reaction can readily proceed from available propargylic alcohols in the presence of pentacarboxycyclopenatadienes (PCCPs) as organocatalysts. This developed strategy provides tetrasubstituted allene derivatives in high yields and under mild reaction conditions.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Fei Wang, Ying Chen, Weidong Rao, Lutz Ackermann, Shun-Yi Wang
Summary: In this work, the authors present a new method for the synthesis of disulfides through a reductive nickel-catalyzed cross-electrophile coupling of unactivated alkyl bromides with symmetrical tetrasulfides, forming unsymmetrical disulfide intermediates. This approach offers practicality and scalability for disulfide synthesis.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Organic
Sun Xinhao, Duan Xuelun, Song Wangze, Jiang Wenfeng
Summary: In this study, diphenyl phosphate was used as a catalyst for the synthesis of sulfoximide-substituted dihydropyranone derivatives with yields ranging from 44% to 78%. The method features mild conditions and good functional group compatibility.
CHINESE JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Organic
Tatsuhiro Uchikura, Irene Sanchez-Sordo, Tatsuhiko Yoshimura, Yudai Makino, Hiroto Osakabe, Takahiko Akiyama
Summary: We have developed a chiral phosphoric acid-catalyzed enantioselective Friedel-Crafts alkylation reaction between pyrroles and indolylmethanols. Wide substrate scope was observed, and a chiral all-carbon quaternary center was constructed at the 3 position of indoles in high yields with high to excellent enantioselectivities (up to 99% ee).
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Applied
Rebecca B. Watson, Todd W. Butler, Jacob C. DeForest
Summary: In this study, we demonstrate the application of Bronsted acid-activated N-acyl imidazoliums as versatile intermediates in carbonyl transformations, showing high efficiency and scalability. The method was successfully validated on a diverse set of compounds with up to 91% yield, including the synthesis of an electron-deficient carbamate on a multikilogram scale.
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2021)
Article
Chemistry, Organic
Valentina Marras, P. Caboni, Francesco Secci, Regis Guillot, David J. Aitken, Angelo Frongia
Summary: A novel Bronsted acid catalyzed tandem reaction efficiently converts anilines and 2-alkylenecyclobutanones into highly functionalized cyclobuta-fused tetrahydroquinoline carboxylic esters with good to high yield. The reaction also achieves a dynamic diastereoselective cyclization, leading to the formation of three contiguous stereocenters with high stereoselectivity.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2021)
Article
Engineering, Biomedical
Xuefei Zhao, Dong Liu, Li Ma, Quan Liu, Kun Chen, Shane Xie, Qingsong Ai
Summary: The study introduces a convolutional neural network with an end-to-end serial-parallel structure for analyzing MI-EEG, and improves cross-subject classification accuracy through transfer learning. Experimental results demonstrate that the model performs well in analyzing multi-class MI activities and successfully reduces the number of training parameters.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2022)
Article
Energy & Fuels
Huihui Zhu, Hongyu Chu, Yaming Zhu, Haitao Bai, Yunliang Xu, Chaoshuai Hu, Junxia Cheng, Xuefei Zhao
Summary: Ethylene residue pitch (ETP) is a by-product of crude oil pyrolysis. Thermal modification of ETP can enhance the quality of derived needle coke. Moderate thermal modification significantly improves the properties of the derived needle coke.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Energy & Fuels
Chaoshuai Hu, Hongyu Chu, Yaming Zhu, Yunliang Xu, Junxia Cheng, Lijuan Gao, Shiquan Lai, Xuefei Zhao
Summary: The study found that mesophase cokes derived from extract-based coal tar pitch have larger and more orderly graphite structure, while residue-based cokes have higher micro-strength intensity. The Tmax values of the two cokes are opposite, and all data of the two cokes exhibit bipolar distribution.
Article
Chemistry, Multidisciplinary
Zijian Yang, Qingjie Fan, Shiquan Lai, Li Yue, Junxia Cheng, Yaming Zhu, Xuefei Zhao
Summary: In this study, N/O-codoped high-capacity porous carbons were prepared by catalytically synthesizing a quinoline pitch (QLP) and then activating it with KOH at high temperature. These porous carbons exhibited excellent electrochemical performances with hierarchical and interconnected pore structures and high N/O-doping contents. They maintained high specific capacitances even under high current densities and showed good cycling stability.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Applied
Fukuan Zhang, Xuefei Zhao, Jie Zhang, Lili Zhao, Lin Li, Jiayi Yang, Hao Li, Haiqing Luo
Summary: In this study, an electrochemically induced method for regio- and stereoselective (E)-beta-C(sp(2))-H trifluoromethylation of enamides was disclosed. The method features catalyst-free, simple setup, and broad substrate scopes, allowing for the synthesis of products with exclusive E-selective control under mild conditions.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Energy & Fuels
Yuzhu Zhang, Xiang Liu, Shihao Gu, Lidong Yan, Yaming Zhu, Chaoshuai Hu, Xitao Yin, Xuefei Zhao
Summary: Through the co-carbonization of coal liquefaction pitch (CLP) and refined soft pitch, high-quality needle coke has been successfully synthesized. Blending CLP and refined soft pitch allows for the adjustment of the thermal stability of the pitch mixture, and co-carbonization is an effective technique for preparing high-quality needle coke.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Integrative & Complementary Medicine
Xuefei Zhao, Jianjun He, Jue Liu
Summary: Positive psychological nursing combined with free posture can significantly improve the prognosis of primipara with singleton spontaneous delivery, by shortening labor stages, reducing pain, and improving delivery outcomes.
EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE
(2022)
Article
Immunology
Linling Lv, Guangcong Ruan, Yi Ping, Yi Cheng, Yuting Tian, Zhifeng Xiao, Xuefei Zhao, Dongfeng Chen, Yanling Wei
Summary: Precision probiotic strains transplantation capsules have significant therapeutic effect on diarrhea irritable bowel syndrome, improving symptoms and the intestinal microbiota of patients.
FRONTIERS IN CELLULAR AND INFECTION MICROBIOLOGY
(2022)
Review
Chemistry, Physical
Jingying Shi, Xuefei Zhao, Can Li
Summary: Surface passivation engineering is a crucial approach to enhance the performance of photoelectrodes in photoelectrochemical (PEC) water splitting. This review summarizes various passivation materials and their preparation methods, characterizations by PEC measurements and related spectral technologies. The distinct features of the passivation effect, separate from other modifications such as cocatalyst decoration, are highlighted. Significant progress in combining surface passivation engineering with other interfacial modification strategies for the rational design of photoelectrodes is demonstrated. Ideas for future research on surface passivation modification to improve the performance of photoelectrodes are also proposed.
Review
Endocrinology & Metabolism
Cunqing Yang, Xuefei Zhao, Xuedong An, Yuehong Zhang, Wenjie Sun, Yuqing Zhang, Yingying Duan, Xiaomin Kang, Yuting Sun, Linlin Jiang, Fengmei Lian
Summary: Diabetic peripheral neuropathy is a chronic metabolic disease that seriously affects patients' quality of life and can lead to amputation and neuropathic pain. Current treatment options only address symptoms and do not reverse nerve damage. Understanding the underlying mechanisms is crucial for prevention and the development of new therapies.
FRONTIERS IN ENDOCRINOLOGY
(2023)
Review
Endocrinology & Metabolism
Xuefei Zhao, Xuedong An, Cunqing Yang, Wenjie Sun, Hangyu Ji, Fengmei Lian
Summary: Insulin resistance (IR) is crucial in metabolism-related diseases and provides a basis for understanding chronic diseases. This study reviewed the causes, mechanisms, and treatments of IR. Various factors including genetics, obesity, and disease lead to abnormalities in the insulin signaling pathway and development of IR. Therapeutic strategies include exercise, dietary changes, chemotherapy, and traditional Chinese medicine treatments. Further research is needed to define biomarkers and explore targeted drug treatments for IR to improve patients' quality of life.
FRONTIERS IN ENDOCRINOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Shushuang Sun, Yaming Zhu, Zishuo Gu, Hongyu Chu, Chaoshuai Hu, Lijuan Gao, Xuefei Zhao
Summary: In this study, bamboo fiber activated carbon (BAC) with high specific surface area and pore volume was prepared through the optimized process using response surface method. Characterization methods were used to analyze the micro-structure of BAC, which showed that BAC maintained the original pores of the bamboo fiber. The adsorption capacity of BAC for crystal violet in simulated wastewater reached a removal rate of 99.96%, and the adsorption process conformed to the pseudo-second-order kinetic model and Langmuir adsorption isotherm model. BAC has great application prospects in dye wastewater treatment.
Article
Chemistry, Multidisciplinary
Yuzhu Zhang, Xiang Liu, Miaomiao Tian, Yaming Zhu, Chaoshuai Hu, Xuefei Zhao
Summary: This study investigated the feasibility of producing high-quality needle coke from coal liquefaction pitch. The co-carbonization of coal liquefaction pitch and anthracene oil was found to be an essential method for controlling the microstructure and properties of the derived needle coke. The addition of anthracene oil was a suitable method for adjusting the properties of coal liquefaction pitch and producing high-quality needle coke.
Article
Spectroscopy
Fan Qing-jie, Song Yan, Lai Shi-quan, Yue Li, Zhu Ya-ming, Zhao Xue-fei
Summary: This paper investigates the structural changes of soft coal tar pitch (SCTP) at different carbonization temperatures using CarbX software and X-ray diffraction (XRD) data. The results provide valuable insights into the microstructure of SCTP and its potential for producing high-quality needle coke.
SPECTROSCOPY AND SPECTRAL ANALYSIS
(2022)
Article
Spectroscopy
Hu Chao-shuai, Xu Yun-liang, Chu Hong-yu, Cheng Jun-xia, Gao Li-juan, Zhu Ya-ming, Zhao Xue-fei
Summary: The regulation of molecular structure and thermal conversion behavior of coal tar pitch is essential for preparing high-quality carbon materials. This study investigated the relationship between pyrolysis behavior and molecular structure of coal tar pitch by extracting 8 kinds of extracts using different organic solvents. The infrared spectra analysis revealed that the extracts are complex compounds composed of condensed aromatic ring structures with aliphatic hydrocarbon side chains containing oxygen and nitrogen. The thermal weight loss behavior of the extracts was studied using thermogravimetric analysis, and the pyrolytic activation energies were calculated. The results showed that the pyrolytic activation energies are closely related to the structure and content of functional groups. The aromaticity index and degree of branching were found to be the main indicators determining the pyrolysis activation energy. The fitting relationship model between the pyrolytic activation energy and the infrared spectral structure indexes was established, providing a better understanding of coal tar pitch's pyrolysis.
SPECTROSCOPY AND SPECTRAL ANALYSIS
(2022)