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| 1 | Chen's Reagent: A Versatile Reagent for Trifluoromethylation,Difluoromethylenation, and Difluoroalkylation in Organic Synthesis显示文摘Methyl fluorosulfonyldifluoroacetate(FSO2CF2CO2Me or MFSDA),often called'Chen's reagent',is commonly used to synthesize trifluoromethylated and difluoroalkylated compounds.This important reagent was initially developed as an efficient trifluoromethylating agent by Professor Qing-Yun Chen and co-workers at Shanghai Institute of Organic Chemistry,Chinese Academy of Sciences in 1989. | Qiqiang Xie Jinbo Hu | 2020 | Chinese Journal of Chemistry2020，38，2： | 6 |
| 2 | Wear-resistant Ag-MAX phase 3D interpenetrating-phase composites:Processing,structure,and properties显示文摘Electrical contact materials are generally Ag-or Cu-based composites and play a critical role in ensuring the reliability and efficiency of electrical equipments and electronic instruments.The MAX(M is an early transition metal,A is an element from III or IV main groups,and X is carbon or/and nitrogen)phase ceramics display a unique combination of properties and may serve as an ideal reinforcement phase for electrical contact materials.The biological materials evolved in nature generally exhibit three-dimensional(3D)interpenetrating-phase architectures,which may offer useful inspiration for the architectural design of electrical contact materials.Here,a series of bi-continuous Ag-Ti_(3)SiC_(2) MAX phase composites with high ceramic contents exceeding 50 vol.%and having micron-and ultrafine-scaled 3D interpenetrating-phase architectures,wherein both constituents were continuous and mutually interspersed,were exploited by pressureless infiltration of Ag melt into partially sintered Ti_(3)SiC_(2) scaffolds.The mechanical and electrical properties as well as the friction and wear performance of the composites were investigated and revealed to be closely dependent on the ceramic contents and characteristic structural dimensions.The composites exhibited a good combination of properties with high hardness over 2.3 GPa,high flexural strength exceeding 530 MPa,decent fracture toughness over 10 MPa·m^(1/2),and good wear resistance with low wear rate at an order of 10^(-5)mm^(3)/(N·m),which were much superior compared to the counterparts made by powder metallurgy methods.In particular,the hardness,electrical conductivity,strength,and fracture toughness of the composites demonstrated a simultaneous improvement as the structure was refined from micron-to ultrafine-scales at equivalent ceramic contents.The good combination of properties along with the facile processing route makes the Ag-Ti_(3)SiC_(2)3D interpenetrating-phase composites appealing for electrical contact applications. | Yu Guo Xi Xie Zengqian Liu Longchao Zhuo Jian Zhang Shaogang Wang Qiqiang Duan Qing Jia Dake Xu Weihai Xue Deli Duan Filippo Berto Zhefeng Zhang Rui Yang | 2024 | Nano Research2024，17，2： | 1 |
| 3 | Regioselective Synthesis of 2,6-Dimethyl-3,5-bis[(3-aryl-5- trifluoromethyl)-isoxazol-4-carbonyl]-pyridine Derivatives显示文摘乙醇 4,4,4-trifluoro-3-oxo-butyrate 与 2,6-dimethyl-3,5-diacetyl-pyridine 反应了 1 面对在 0 瑡潩的 NaOC2H5 吗? | Yindi Yang Min Zhang Yiwen Zhu Li Zhang Qiqiang Xie Liping Song Hongmei Deng | 2013 | Chinese Journal of Chemistry2013，31，7： | 0 |
| 4 | Geographical differences of leaf traits of the endangered plant Litsea coreana Levl.var.sinensis and its relationship with climate显示文摘Seventeen morphological and anatomical characteristics of the leaves were selected from five natural populations to explore the variation in leaf traits of Lits ea core ana var.sinensis and the effects of geographical environment on these variations.Nested analysis of variance,multiple comparisons,principal component analysis(PCA),and correlation analysis were conducted to explore the variations within and between populations and their correlation with geographical and climatic factors.Significant differences in the 17 leaf traits were observed within and among populations.On average,the relative contribution of within population variation to total variation was 24.8%,which was lower than among population variation(54.6%).The average differentiation coefficient of the traits was 65.8%,and the average coefficient of variation 11.8%,ranging from6.7%for main vein thickness to 21.4%for petiole length.The PC A results showed that morphological characteristics were divided into two categories,and the level of variation was greater than that of leaf anatomy.Most of the leaf traits were significantly correlated with geography and climate and showed a gradual variation with longitude,latitude,and altitude.In areas with high temperatures,less rainfall,and strong seasonal rainfall,the leaves are larger,longer and thicker.This study shows that variations in leaf traits of L.coreana var.sinensis mainly come from variations among populations.The level of trait differentiation among populations is high and the level of variation within populations low.These findings help further understand leaf morphological characteristics of this species and can provide a valuable reference for the protection and sustainable utilization of this natural resource. | Gangyi Yuan Qiqiang Guo Yaqin Zhang Qin Gui Na Xie Siqiong Luo | 2023 | Journal of Forestry Research2023，34，1： | 0 |
| 5 | Copper-Mediated Deuterotrifluoromethylation of α-Diazo Esters显示文摘α
的调停铜的 deuterotrifluoromethylation ? 在重氢氧化物的提升下面的重氮基的酉旨(D 2 O ) 为标记重氢的 trifluoromethyl 混合物的合成被开发了。这 deuterotrifluoromethylation 反应具有宽广范围并且能负担得起 deuterated 产品与比 99% 同位素的纯净高。而且,这调查的结果也提供一些试验性的证据支持我们的以前建议的 trifluoromethylation 机制。 | Mingyou Hu Qiqiang Xie Xinjin Li Chuanfa Ni Jinbo Hu | 2016 | Chinese Journal of Chemistry2016，34，5： | 0 |
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