SYNTHESIS-STUTTGART
·
2019
·Vol. 52
·期 02
·297-303
·
IF 2.867
Yi Zhang,Dongheng Zhou,Yongmin Ma,Jing Chen
A simple and efficient procedure for the synthesis of N-[(methylthio)methyl]benzamides and methylene-bridged unsymmetrical bisamides was achieved mediated by DMSO in the presence of acetic acid. DMSO plays a dual role in the transformation, as not only a solvent, but also an environmentally benign methylene source. The protocol provides new strategies for effective synthesis of unsymmetrical bisamides and avoids the use of transition-metal catalysts.
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PLANTA MEDICA
·
2014
·
IF 2.339
Hui Xiong,Xin Ding,Xin-zhou Yang,Guang-zhong Yang,Zhi-nan Mei
Ten new triterpene saponins (1–10) have been isolated from the stems of Entada phaseoloides. Their structures were elucidated by spectroscopic analysis and chemical methods. Among these compounds, the aglycons of 6–10 are being reported for the first time, in this study, including 3β,15α,16α-trihydroxy-11α,12α-epoxy olean-28,13β-olide (6), 3β,15α,16α-trihydroxy-11-oxo-olean-12-en-28-oic acids (7 and 8), and 3β,15α,16α-trihydroxy-oleana-11,13(18)-dien-28-oic acids (9 and 10). The cytotoxic activities of all of these compounds were evaluated against HepG-2, A549, and Ec-1 cell lines.
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DOI
PubMed
高影响因子
SYNLETT
·
2018
·Vol. 29
·期 09
·1244-1248
·
IF 2.369
Xiangwen Kong,Lihua Liu,Siqin Luo,Shilu Fan,Haisheng Qian,Hua Xiao
A triphenylphosphine-promoted [3+2] cycloaddition of α,γ-bis-substituted allenoates and N-tosylaldimines followed by alkene isomerization was disclosed, affording a series of functionalized 2-pyrroline derivatives in moderate chemical yields with random diastereoselectivities.
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SYNTHESIS-STUTTGART
·
2019
·Vol. 51
·期 17
·3221-3230
·
IF 2.867
Wei Sun,Mingjuan Zhang,Peilang Li,Yiqun Li
A novel and highly efficient one-pot synthesis of polysubstituted imidazoles from α-hydroxyphenylacetic acids, diphenylacetylene, and amines has been achieved by Pd(OAc)2/Ce(SO4)2/Bi(NO3)3 trimetallic catalytic system. A series of control experiments showed that this overall reaction occurs through a one-pot cascade process combining the steps of decarboxylation of α-hydroxyphenylacetic acids, Wacker-type oxidation of diphenylacetylene, and Debus–Radziszewski annulation of aryl aldehydes and benzil generated in situ, as well as amines. This reaction represents a novel multicomponent reaction using α-hydroxyphenylacetic acids and diphenylacetylene as sources of aryl aldehydes and a β-diketone. This process exhibits a broad substrate scope and a good functional group tolerance to assemble the corresponding polysubstituted imidazoles in excellent yields (72–88%) under mild conditions.
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高影响因子
SYNTHESIS-STUTTGART
·
2022
·Vol. 54
·期 09
·2251-2257
·
IF 2.969
Cheng Ye,Weiqi Tong,Fan Wu
A nickel-catalyzed cross-electrophile coupling is disclosed in which a range of vinyl bromides were utilized as electrophiles with oxalates derived from α-hydroxy carbonyls as precursors to carbonyl radical coupling partners. This method is compatible with a broad range of functional groups, providing a complementary solution for the construction of β,γ-unsaturated carbonyl compounds.
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高影响因子
SYNTHESIS-STUTTGART
·
2016
·Vol. 48
·期 17
·2829-2836
·
IF 2.652
Qingchen Zhang,Xuan Wang,Qun Qian,Hegui Gong
Systematic studies of the coupling of benzylic with aryl halides are presented. The optimized reaction conditions for electron-deficient aryl halides cannot be applied to the electron-rich or neutral counterparts, and vice versa. The excellent functional group tolerance and broad substrate scope may enable the current work to be useful for the construction of diaryl methane products.
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高影响因子
SYNTHESIS-STUTTGART
·
2022
·Vol. 54
·期 18
·3977-3988
·
IF 2.969
Jiapan Niu,Bowen Liu,Chun Zhang
A novel and practical method to synthesize trifluoromethyl tertiary alcohols has been developed. Under mild reaction conditions, the present reaction could be compatible with a wide range of functional groups. Moreover, the performance of gram-scale reaction and further transformations illustrated the good potential utility of the present chemistry. Furthermore, the radical process of this reaction has been proved by mechanistic studies.
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高影响因子
SYNTHESIS-STUTTGART
·
2013
·Vol. 45
·期 24
·3387-3391
·
IF 2.5
Congyan Chen,Bo Liu,Wanzhi Chen
Various imidazolium salts bearing hydrophilic groups were prepared that reacted with copper powder to afford water-soluble copper complexes of N-heterocyclic carbenes. These copper complexes can catalyze the selective oxidation of benzyl alcohols to the corresponding aldehydes in water at room temperature without the need for a base.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 16
·47025-47037
·
IF 5.8
Wang Tianyu,Yang Lang,Rao Feng,Jiang Kaixi,Byrynnai Choduraa
Adding organics in the process of geopolymer synthesis can combine the functional groups of organics with the three-dimensional structure of geopolymer, thus changing the properties of geopolymer such as compressive strength, flexural strength, and acid resistance. In this work, excellent mechanical properties and acid resistance of metakaolin-blast furnance slag (Mk-BFS)-based geopolymer were synthesized by the incorporation of chitosan. The formation of sodium-alumino-silicate-hydrate (N-A-S–H) gel and calium-alumino-silicate-hydrate (C-A-S–H) gel in geopolymerization were characterized by 29 Si nuclear magnetic resonance (NMR). At 5% of chitosan, the compressive strength of Mk-BFS-based geopolymer could reach to 33.7 MPa. The results could be ascribed to that chitosan reacts with geopolymer to generate new C-O-Si structure meanwhile adhesion produced by the combination of positively charged cations and negatively charged ions makes the structure of geopolymer denser. After 7 days of sulfuric acid immersion, the reduction of compressive strength is less than 3 MPa, demonstrating its great acid resistance. The acid resistance of Mk-BFS-based geopolymer could attribute to that the free amino groups in chitosan preferentially react with acid solution and weakened the erosion of sulfuric acid. This study optimizes the compressive strength and acid resistance of geopolymer by adding appropriate amount of chitosan.
研究领域:
材料科学
·
硅酸盐化学
·
无机非金属材料
·
功能复合材料
·
建筑材料
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高影响因子
Nano Energy
·
2025
·
IF 17.1
Zeshuang Kong,Dafeng Zhang,Junchang Liu,Xue-Yang Ji,Peiqing Cai,Xipeng Pu,Huayang Zhang
In the S-scheme heterojunction, photogenerated electrons from the oxidation photocatalyst recombine with holes from the reduction photocatalyst, enhancing redox potential and boosting photocatalytic activity. However, the recombination mechanism at these interfaces remains largely unexplored. In this study, we design a Cd 0.9 Zn 0.1 S/ZnWO 4 (CZS/ZWO) S-scheme heterojunction model guided by theoretical predictions. Remarkably, a nano-tetrapod-shaped CZS/ZWO S-scheme heterojunction is synthesized via a simple solvothermal and ultrasonic self-assembly method, achieving hydrogen evolution performance under visible light irradiation for 3 h that is 3.69 times higher than CZS alone and 4.63 times higher than ZWO alone. Further theoretical calculations simulate the charge transfer mechanism, electron density localization, and transition states in the photocatalytic hydrogen evolution reaction. Finally, integrating theoretical and experimental data, an S-Zn channel is proposed within the CZS/ZWO S-scheme heterojunction, clarifying the electron transfer pathway. This study provides a detailed understanding of charge transfer dynamics in S-scheme heterojunction.
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL TOXICOLOGY
·
2020
·Vol. 44
·期 6
·596-600
·
IF 3.513
Wang Ting,Shen Baohua,Wu Hejian,Gu Jun,Shen Min,Xiang Ping
In this study, the relationships between the concentrations of R/S-methamphetamine (MA) and its metabolite R/S-amphetamine (AP), the AP/MA ratio in hair samples, and MA dependence were investigated by performing segmental hair analysis in MA users. Authentic hair samples collected from 10 chronic MA abusers were cut into 1-cm sections (a total of 120 segments). The concentrations of MA and AM enantiomers were quantitatively measured by the LC–MS-MS method. The S-MA concentrations ranged from 1.17 to 256.41 ng/mg and the S-AP concentrations ranged from 0.11 to 23.31 ng/mg in the 120 segments. S-MA and S-AP were the most common analytes identified in hair; no R-MA or R-AP was found. The S-AP/S-MA ratios ranged from 0.03 to 0.32, indicating that the subjects primarily consumed S-MA rather than R-MA or AP. The S-AP/S-MA ratios in the long hair of all chronic MA abusers showed some variation, but there was an overall trend of gradual increase from the distal to the proximal end. This trend was independent of the drug concentrations. Therefore, we could conclude that the AP/MA ratios increased with the duration of MA abuse, and a higher AP/MA ratio suggested high MA dependence. There was no chiral conversion of MA or AP in the hair matrix. The segmental hair analysis showed that all subjects continuously used S-MA, and some users showed an increase in drug dose or the frequency of use.
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DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2011
·Vol. 67
·期 9
·1761-1771
·
IF 1.215
Zhu Ming,Liu Xiao,Liu Baijun,Jiang Zhenhuan,Matsumoto Toshihiko
A new diamine monomer, 1,5-bis[4-(4-aminophenoxy)]benzoyl-2,6-dimethoxynaphthalene, was synthesized via a Friedel–Crafts acylation reaction followed by an aromatic nucleophilic substitution reaction. Six ether–ketone linked polymers, named as poly(ether ketone azomethane)s and poly(ether ketone imide)s, were successfully prepared through the polycondensations of the diamine monomer with dialdehydes and dianhydrides, respectively. These naphthylated polymers exhibited high T
g values (142–288 °C), due to their bulky and rigid chemical structure. Meanwhile, they showed good thermal stability and improved solubility. Typically, some of them were casted into thin flexible film and showed high moduli.
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