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Chinese Chemical Letters 2011年第8期22卷 911-914页

作者： Hong She Wang Wei Xing Zhao shaanxi key laboratory for phytochemistry Baoji University of Arts and Sciences Baoji 721013 China

An efficient magnesium bistrifluoromethanesulfonimide[Mg（NTf_2）_2]catalyzed hydroalkylation of aromatic olefins with 1,3- diketones under solvent-free conditions has been *** reactions proceed smoothly to give the d... 详细信息

关键词： Hydroalkylation Aromatic oletins 1 3-Diketones Magnesium bistrifluoromethanesulfonimide

Iodine catalyzed efficient synthesis of symmetrical diaryl sulfoxides from arenes and thionyl chloride under solvent-free conditions

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Chinese Chemical Letters 2007年第12期18卷 1447-1450页

作者： Hong She Wang Jun E. Zeng shaanxi key laboratory for phytochemistry Baoji University of Arts and Sciences Baoji 721007 China

Synthesis of symmetrical diaryl sulfoxides from arenes and thionyl chloride in the presence of a catalytic amount of iodine at room temperature under solvent-free conditions is described. Mild reaction conditions, eas... 详细信息

关键词： Aryl sulfoxides Arenes Thionyl chloride

Carbon Tetrabromide/Triphenylphosphine-Activated Beck- mann Rearrangement of Ketoximes for Synthesis of Amides

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Chinese Journal of Chemistry 2017年第11期35卷 1673-1677页

作者： Peng Gao Zijing Bai shaanxi key laboratory of phytochemistry College of Chemistry and Chemical Engineering Baoji University of Arts and Sciences Baoji Shaanxi 721013 China

An efficient Beckrnann rearrangement of ketoximes was developed using carbon tetrabromide/triphenylphos- phine as an organocatalyst without addition of any acids or metals. The reaction showed good functional group to... 详细信息

关键词： Beckmann rearrangement oganocatalyst ketoximes amides

Temperature-stable dielectric properties from 100 to 375℃ in system (K0.495Na0.495La0.01)(Nb0.997Cu0.0075)O3-Bi(Mg0.5Zr0.5)O3

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Rare Metals 2019年第12期38卷 1193-1198页

作者： Hua-Lei Cheng Li-Fang Zhao Jian Xiao Peng Gao Ping Wen Wan-Cheng Zhou Hong-Liang Du shaanxi key laboratory of phytochemistry Department of ChemistryBaoji University of Arts and SciencesBaoji 721013China State key laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China

(1-x)(K(0.495)Na(0.495)La(0.01))(Nb(0.997)Cu(0.0075))O3-xBi(Mg(0.5)Zr(0.5))O3(abbreviated as KNLNC-xBMZ) ceramics were designed and *** phase transition,microstructure and electrical properties of the ceramics were *** phase structures of the ceramics transform from orthorhombic to pseudocubic phases and the grain sizes decrease gradually with BMZ content(x) ***,BMZ additions can significantly enhance the dielectric temperature stability and decrease the dielectric loss of ceramics over a relatively broad temperature ***-0.02 BMZ ceramics exhibit high dielectric permittivity(εr=1542) and small variation(Δεr/ε(r150℃)≤±15%)in dielectric permittivity from 100 to 375℃,and low dielectric loss(tanδ≤2%) in the temperature range of 100-350℃,which suggests that this ceramic is a candidate for high-temperature capacitor application.

关键词： (K(0.5)Na(0.5))NbO3 Lead-free Microstructure Dielectric properties Elevated temperature stability

Low-viscosity oligoether esters(OEEs)as high-efficiency lubricating oils:Insight on their structure‒lubricity relationship

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Friction 2024年第6期12卷 1133-1153页

作者： Hanwen WANG Ying WANG Ping WEN Lin MA Mingjin FAN Rui DONG Chunhua ZHANG shaanxi key laboratory of phytochemistry College of Chemistry&Chemical EngineeringBaoji University of Arts and SciencesBaoji 721013China key laboratory of shaanxi Province for Development and Application of New Transportation Energy Chang’an UniversityXi’an 710064China

Development of energy-efficient lubricants is a way to reduce energy consumption for transportation,with the tendency to design molecules that are beneficial in reducing the viscosity of synthetic *** esters(OEEs),as a low-viscosity ester base oil,have characteristics such as simple synthesis and excellent lubrication effect;however,the application of OEEs in tribology field has rarely been *** objective of the present study is to investigate the effect of structure on the lubricating performance of OEEs and to develop a predictive model for OEEs based on quantitative structure‒property relationship(QSPR)through a combination of experiment and statistical *** showed that glycol chains contribute positively to lubrication with the ether functional groups increasing the sites of *** to branched-chain OEEs,straight-chain OEEs exhibited reduced wear,which was mainly due to the thicker adsorption film formed by the straight-chain ***,carbon films were detected on lightly worn surfaces,indicating that OEEs underwent oxidation during the friction *** on the results of principal component analysis(PCA)and partial least squares(PLS),it could be found that the predictive models of viscosity‒temperature performance,thermal stability performance,coefficient of friction(COF),and wear volume(WV)performed well and *** them,COF and WV can be best predicted with an R^(2) of about 0.90.

关键词： oligoether esters(OEEs) low-viscosity ester friction wear quantitative structure-property relationship(QSPR)

Adsorption of Cr(Ⅵ) in wastewater using magnetic multi-wall carbon nanotubes

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Water Science and Engineering 2015年第3期8卷 226-232页

作者： Zhuo-nan Huang Xiao-ling Wang De-suo Yang key laboratory for phytochemistry of shaanxi Province Baoji University of Arts and Sciences College of Chemistry and Chemical Engineering Baoji University of Arts and Sciences

Magnetic multi-wall carbon nanotubes were prepared with wet chemical treatments and characterized by a transmission electron microscope （TEM） and X-ray diffraction （XRD）. They were used as adsorbents for the removal of Cr（VI） in aqueous solutions. The effects of adsorbent dosage, the concentration of Cr（VI） in aqueous solution, temperature, and pH value on the removal efficiency were studied. Results showed that the adsorption capacity of the magnetic multi-wall carbon nanotubes increased with the initial Cr（VI） concentration, but decreased with the increase of adsorbent dosage. The adsorption amount increased with contact time. The adsorption kinetics were best represented by the pseudo second-order kinetic model, and the adsorption isotherms indicated that the Langmuir model better reflected the adsorption process. The ob- tained calculation results for the Gibbs free energy revealed that the adsorption was a spontaneous and endothermic process. The enthalpy deviation was 3.835 *** 1. The magnetic multi-wall carbon nanotubes showed significant potential for application in adsorption of heavy metal ions.

关键词： Magnetic multi-wall carbon nanotubes Cr(VI) Adsorption Kinetics Thermodynamics

Palladium-catalyzed oxidative cyclopropanation of enamides and norbornenes initiated by C–H activation

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Science China Chemistry 2018年第6期61卷 695-701页

作者： Ming Chen Mi-Na Zhao Yao-Du Zhang Zhi-Hui Ren Zheng-Hui Guan key laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education Department of Chemistry & Materials Science Northwest University shaanxi key laboratory of phytochemistry College of Chemistry and Chemical Engineering Baoji University of Arts and Sciences

A novel palladium-catalyzed oxidative cyclopropanation of enamides and norbornenes has been developed. The reaction proceeded through palladium-catalyzed vinyl C–H bond activation of enamides followed by two migratory insertions, β-(N)H elimination and hydrolyzation cascade steps. The reaction tolerates a range of functional groups and provides an effective method for the synthesis of cyclopropane-fused norbornanes in good yields under mild conditions.

关键词： palladium-catalyzed cyclopropanation C–H activation enamides norbornenes

The ground-state structure and physical properties of RuC: first-principles calculations

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Chinese Physics B 2012年第7期21卷 410-415页

作者：张美光闫海燕张刚台王晖 Department of Physics and Information Technology Baoji University of Arts and Sciences shaanxi key laboratory for phytochemistry Department of Chemistry and Chemical EngineeringBaoji University of Arts and Sciences National laboratory of Superhard Materials Jilin University

We have extensively explored the ground-state structure of RuC using the particle swarm optimization algorithm for crystal structural prediction. A hexagonal I：t-3m structure has been proposed ms the best candidate, which is energetically more favorable than the previously proposed zinc blend structure. The R-3m-RuC possesses alternative stacking of double hexagonal close-packed Ru atom layers and C atom layers, and it is dynamically stable evidenced by the calculation of phonon dispersion. The calculated large bulk modulus, shear modulus, and elastic constant C44 reveal that it is an ultra-incompressible and hard material. The evidence of strong covalent bonding of Ru C, which plays an important role to form a hard material, is manifested by the partial densities of states analysis.

关键词： transition metal carbides structure prediction ultra-incompressible material

One-Pot Synthesis of 4-Aryl-NH-1,2,3-Triazoles through Three- Component Reaction of Aldehydes, Nitroalkanes and NaN3

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Chinese Journal of Chemistry 2017年第12期35卷 1808-1812页

作者： Rongrong Hui Mina Zhao Ming Chen Zhihui Ren Zhenghui Guan key laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education Department of Chemistry & Materials Science Northwest University Xi'an Shaanxi 710127 China shaanxi key laboratory of phytochemistry College of Chemistry and Chemical Engineering Baoji University of Arts and Sciences Baoji Shaanxi 721013 China

A one-pot three-component reaction of aldehydes, nitroalkanes and NaN3 for the synthesis ofNH-1,2,3-triazoles has been developed. The reaction provides a safe, efficient and step-economic approach for the synthesis of... 详细信息

关键词： aldehydes sodium azide one-pot three-component reaction NH-1,2,3-triazoles

Iodine-catalyzed Efficient Synthesis of β-Keto Esters from Aldehydes and Ethyl Diazoacetate Under Solvent-free Conditions

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Chemical Research in Chinese Universities 2009年第3期25卷 343-346页

作者： WANG Hong-she ZENG Jun-e shaanxi key laboratory for phytochemistry Department of Chemistry and Chemical Engineering Baoji University of Arts and Sciences Baoji 721013 P. R. China

An efficient procedure for the synthesis ofβ-keto esters from the reaction of aldehydes and ethyl diazoacetate catalyzed by iodine at room temperature under solvent-free conditions has been described. The catalytic p... 详细信息

关键词： Iodine β-Keto ester Aldehyde Ethyl diazoacetate