Vietnam Journal of Chemistry
·
2023
·Vol. 61
·期 2
·204-209
·
IF 0.9
Nguyen Van Vinh Ha,Nguyen Thi Thu Ha,Ong Ngoc Khanh,Dinh Truc Phuong,Ho Thanh Nhat,Nguyen Thanh Tung
Herein we reported a method for copper pivalate mediated, directed functionalization of ortho C−H bonds in (2-methylthio)aniline benzamides. Diaryl disulfides were used for thiolation, while successful phenoxylation was obtained with phenol as the coupling agent. Our report marks a rare example for flexible transformation of benzamide C(sp 2 )−H bonds into the corresponding unsymmetrical diaryl ethers and thioethers.
研究领域:
有机化学
·
合成化学
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DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2021
·
IF 6.141
Feifei Zhou,Ganghua Pan,Renjie Mi,Mimi Zhan
Enhancing the properties of concrete using C-S-H seed has been a challenging task due to its agglomeration in the cement matrix. Here, for ensuring synthetic C-S-H disperse well in the cement matrix, it was first synthesized in situ on fly ash (FA) by co-precipitation method, and the C-S-H grown in situ on FA (C-S-H@FA) was received. And then, its phase composition, morphology and particle size distribution were studied. After that, its effect on the hydration kinetics of cement, and the workability, strength development, pore structure, durability of concrete was explored. The results showed that the hydration of cement can be stimulated more dramatically by C-S-H@FA when compared with C-S-H, as well as the strength development of concrete. Besides, the addition of C-S-H@FA can refine the pores in concrete, and make concrete more compact than incorporating C-S-H. Furthermore, when C-S-H was replaced by C-S-H@FA, the carbonation resistance and drying shrinkage resistance of concrete was improved. Therefore, it can be concluded that the C-S-H grown in situ on FA has better dispersibility than C-S-H in concrete, improving the comprehensive properties of concrete more effectively.
研究领域:
材料科学
·
土木工程
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DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2021
·
IF 4.354
Yan-Ling Song,Bei Li,Zhen-Biao Xie,Dan Wang,Hong-Mei Sun
Iron-catalyzed oxidative amination of benzylic C(sp3)–H bonds with anilines bearing electron-withdrawing groups (EWGs) or electron-donating groups (EDGs) is realized based on simple variations of N-substituents on imidazolium cations in novel ionic Fe(III) complexes. The structural modification of the imidazolium cation resulted in regulation of the redox potential and the catalytic performance of the iron metal center. Using DTBP as oxidant, [HItBu][FeBr4] showed the highest catalytic activity for anilines bearing EWGs, while [HIPym][FeBr4] was more efficient for EDG-substituted anilines. This work provides alternative access to benzylamines with the advantages of both a wide substrate scope and iron catalysis.
研究领域:
有机化学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Yueqing Wang,Hongxing Wang,Junbo Zhang,Hongyan Zheng,Long Huang,Yulei Zhu
Selectively converting fructose into furfural by H-beta catalyst is a very interesting catalytic process. However, it is a challenging task to clearly elucidate the roles of framework Al for selective scission of C C and C O bond. Herein, selective elimination of framework Al atoms is realized. Several detailed investigations showed that the framework Al species located in different sites play important role in furfural formation. The framework Al atoms of pristine H-beta mainly occupied at T1, T2, T5, T6 and T7 sites. These Al species at pore mouth can be removed by citric acid, while the treatment of nitric acid mainly eliminated the framework Al atoms from T2 and T7 sites. As for oxalic acid, the Al atoms occupied at T2, T5, T6 and T7 was primarily leached. Upon citric acid and nitric acid treatment afforded the similar yield of furfural, indicating that the formation of furfural could not be governed by these Al species at pore mouth, T2 and T7 sites. However, in the case of oxalic acid treatment, complete removal of the Al species on T2, T5, T6 and T7 sites decreased the yield of furfural. Thus, it is reasonably inferred that these Al atoms populated at T1 sites and intersecting channels is more encouraging for the splitting of C C bond, while the Al species occupied at T5, T6 sites and the larger straight channels is probably more favorable to scission of C O bond.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Hao-Jia Guo,Xiaodong Qiao,Ben-Xiang Hu,Shuangquan Liao,Ming-Chao Luo
The recycling of waste rubber (WR) is beneficial to the sustainable development of rubber industries. However, interactions among WR are weak, limiting the recycling of WR. In this work, our group designed bis-diazo compounds to promote interactions among WR for recycling through aliphatic C–H insertion strategies. Specifically, upon hot pressing, bis-diazo compounds produce bis-carbenes which react with C–H on the surface of WR by C–H insertions, and then we obtain recycled WR materials. As a result, stress–strain curves show that the strength of recycled WR increases steadily with the increase of bis-diazo compound loading, which has reached the level of butadiene styrene rubbers. Moreover, the introduced disulfide bonds endow recycled WR with reprocessability. Stress–relaxation experiments at different temperatures show that recycled WR with disulfide bonds have unique vitrimer viscoelastic properties. The feasibility of bis-diazo compounds to enhance interactions among WR through C–H insertions opens opportunities to recycle and reinvent industrial WR.
研究领域:
材料科学
·
化学工程
·
回收技术
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Haodong Duan,Xiaolei Xu,Kangwei Leng,Ge Guo,Qing Yu,Xinjin Li,Yuxi Han,Jun Gao,Zhongwei Wang
The characteristics of the reaction for the preparation of dichlorophenylphosphine (DCPP) via benzene and PCl 3 in the presence of AlCl 3 were studied. Some unique characteristics were observed when a catalytic amount of AlCl 3 was used. Namely, more than one mole of DCPP was obtained per mole AlCl 3 , the reaction solution was layered, and DCPP could be directly separated. Our mechanistic study showed that benzene reacted with PCl 3 to form DCPP-AlCl 3 , and DCPP-AlCl 3 dissociated into DCPP and AlCl 3 , continuing to catalyze this reaction. This resulted in the high catalytic efficiency of AlCl 3 . The layering of the reaction solution was caused by the immiscibility of DCPP-AlCl 3 with the raw materials, greatly facilitating the dissociation process of DCPP-AlCl 3 . The formation of diphenylphosphorus chloride (DPC) was due to a continuous Friedel-Crafts reaction between DCPP and benzene. DPC cooperated with AlCl 3 to form the stable coordination compound DPC-AlCl 3 that did not dissociate and was responsible for the deactivation of AlCl 3 .
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Zhe Wang,Chunpeng Wang,Bing Lu,Zhirong Chen,Yong Wang,Shanjun Mao
Interface has often played significant role in the behavior of metal-based catalysts during various heterogeneous reactions. Herein, we reported a novel interfacial pathway for propane dehydrogenation on Pt-GaO x dual sites. The active ensemble, composing Pt particles and Ga 2 O 3 clusters, facilitates the facile dissociation of C–H bonds (energy barrier < 0.30 eV) through H-abstraction by O sites, coupled with alkyl stabilization on the Pt surface. Notably, the electronic perturbation of the Pt slab induces higher-lying O 2 p states at the interface, accompanied by a substantial density of states around fermi level. This is in stark contrast to the O species present in Ga 2 O 3 crystals or clusters alone, leading to an exceptionally strong affinity for H and a robust ability for C–H scission. The Pt/Ga-Al 2 O 3 catalysts prepared with Pt nanoparticles decorated by Ga oxide exhibit superior performance compared to Pt/Al 2 O 3 and PtSn/Al 2 O 3 catalysts. This insight into interfacial catalysis contributes to a broader understanding of the origin of the high catalytic efficiency observed in metal-based catalysts.
研究领域:
催化化学
·
材料科学
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2022
·Vol. 13
·期 10
·1437-1445
·
IF 5.364
Yongjie Zhang,Xiaopei Li,Wenqin Zhu,Pibo Liu,Juntao Ren,Shangtao Chen,Yanming Hu,Guangyuan Zhou
Post-modification of polyolefins by cutting-edge C–H activation has recently emerged as an attractive methodology for the incorporation of precise functionalities, thus expanding their applicability and creating value-added materials. In this report, chromone (CM), the core of naturally occurring molecules possessing manifold biological and pharmacological activities, was incorporated into polyethylene (PE) through the recently developed radical-mediated alkane C–H activation approach. The reaction was conducted in the presence of di-tertbutyl peroxide as the oxidant and a small amount of naphthalene as the solvent or under solvent-free conditions. The produced CM-grafted PEs (CM-PEs) exhibited intriguing antioxidative and fluorescence properties as revealed by thermogravimetric analysis (TGA) and fluorescence microscopy. Moreover, CM-PEs were successfully demonstrated to act as a polymer-bound antioxidant, a fluorescence marker for plastic sorting, and a traceable compatibilizer for the PE/polystyrene blend, revealing that CM-PE is a multi-functional material.
研究领域:
材料科学
·
高分子化学
·
生物医学工程
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Lipeng Zhou,Zhen Liu,Meiting Shi,Shanshan Du,Yunlai Su,Xiaomei Yang,Jie Xu
Sulfonated hierarchical H-USY zeolite was prepared and characterized by X-ray diffraction, N 2 physisorption, Fourier transform infrared spectroscopy, inductively coupled plasma atomic emission spectroscopy, temperature-programmed desorption of ammonia, and acid–base titration. It was proved that sulfonic group was successfully anchored onto the hierarchical H-USY zeolite. The acidity of the hierarchical H-USY was remarkably improved. Sulfonated hierarchical H-USY zeolite was efficient for the hydrolysis of hemicellulose and cellulose. The yield of TRS for hydrolysis of hemicellulose reached 78.0% at 140 °C for 9 h. For hydrolysis of α-cellulose, 60.8% conversion with 22.4% yield of glucose was obtained. Even for microcrystalline cellulose, 43.7% conversion with 15.1% yield of glucose can be obtained. These results are much higher than those obtained over hierarchical H-USY zeolite, indicating that both the acidity and the pore structure determine the activity of zeolite as catalyst in the hydrolysis of biomass.
研究领域:
化学工程
·
生物质能
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Asian Journal of Organic Chemistry
·
2017
·Vol. 7
·期 1
·240-247
·
IF 2.788
Rui Yan,Zhong-Xia Wang
Graphical Oxidative coupling of allylic alcohols : [Cp*RhCl 2 ] 2 was demonstrated to catalyze the oxidative coupling of alkenylpyridines with allylic alcohols through alkenyl C−H activation in the presence of AgOTf and AgOAc to afford β-alkenyl ketones and aldehydes in moderate to good yields. [Cp*RhCl 2 ] 2 was demonstrated to catalyze the oxidative coupling of alkenylpyridines with allylic alcohols through alkenyl C−H activation in the presence of AgOTf and AgOAc to afford β-alkenyl ketones and aldehydes in moderate to good yields. Allylic alcohol, 1-aryl and 1-alkyl allylic alcohols can be coupled with various alkenylpyridines. The reaction occurred at the γ-position of allylic alcohols and the cis -β-position of the alkenylpyridines.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 17
·21858-21868
·
IF 2.478
Wang Jinmao,Yan Hong,Long Yumei,Li Weifeng
In this work, a series of h -BN/ α -SnWO 4 (BN/SW) nanocomposites with different h -BN concentrations (0.3–1.0 wt%) were prepared through a hydrothermal method. The composition, structure and morphology of BN/SW nanocomposites were systematically investigated. The formation of BN/SW heterojunction was evidenced by Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM). The BN/SW composites showed plate-to-plate structure consisting α -SnWO 4 and h -BN nanoplates. The optical and photoelectrochemical studies revealed that the decorating of h -BN can significantly facilitate the separation of the photo-created charge carries due to the formation of heterostructure. As a result, BN/SW hetero-structure exhibited the superior photocatalytic performance under visible light, which was confirmed by the photo-degradation of methyl orange (MO) and tetracycline (TC). Especially, the BN/SW-0.5 sample has the best rate constant of 0.0323 min −1 , which is 4.6 times larger than that of α -SnWO 4 . Based on trapping experiment, the h + radical was identified as the dominant reactive species, and ·O 2 − and ·OH also made contribution to the photocatalysis. In addition, the photocatalytic enhancement mechanism of BN/SW heterojunction was proposed. This study shed light on the roles of h -BN in the design of photocatalysts with high-performance.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Science of Advanced Materials
·
2014
·Vol. 6
·期 9
·1936-1942
·
IF 2.908
Li Xiang,Ding Xuelian,Wang Gongke,Zhou Yixuan,Hou Ruipeng,Gao Shuyan,Lu Yan
In this work, we have developed a simple and highly sensitive fluorescent biosensor for the detection of HIV-1 RNase H activity and inhibition by using graphene oxide (GO) as sensing platform. In our approach, a DNA-RNA substrate was prepared which a carboxy fluorescein (FAM) was labeled
at the 3 termini of single strand DNA. The FAM labeled DNA-RNA substrate preserves most of the fluorescence when mixed with GO. However, in the present of RNase H, RNase H can cleavage the RNA into fragments, resulting in the dissociation of ssDNA and mononucleotides. The fluorescence intensity
was greatly quenched after the addition of GO. Because of the super quenching ability of GO, the as-proposed method provides a wide linear range from 1.0 to 26.3 units mL–1 and a low detection limit of 0.6 units mL–1 for HIV-1 RNase H activity analysis. Additionally,
this approach shows potential for high-throughput screening of HIV-1 RNase H inhibitors. The method not only provides a universal platform for monitoring activity and inhibition of RNase H but also shows great potential in biological process researches, drug discovery, and clinic diagnostics.
研究领域:
生物技术
·
分子生物学
·
纳米技术
·
病毒学
·
药物发现
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）