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Acylation of salicylamide to 5-acetylsalicylamide using ionic liquids as dual catalyst and solvent
Weiguang Chen,Yunsheng Zhang,Zhangzhun Lu,Aili Wang,Yutang Shen,Tingshun Jiang,Longbao Yu,Hengbo Yin 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.5
The Lewis acidic ionic liquids, 1-butyl-3-methylimidazolium chloroaluminate ([BMIM]Cl-nAlCl3) and Nbutylpyridinium chloroaluminate ([BPy]Cl-nAlCl3), were used as both catalyst and solvent in Friedel–Crafts acylation of salicylamide with acetyl chloride to 5-acetylsalicylamide. The Lewis acidic ionic liquids, substituting for the conventional carcinogenic nitrobenzene solvent and anhydrous AlCl3catalyst, showed excellent catalytic activity in the acylation of salicylamide to 5-acetylsalicylamide. When [BMIM]Cl-2AlCl3 was used as the catalyst, the yield of 5-acetylsalicylamide reached 81.3%. When [BPy]-2AlCl3 was used as the catalyst, the maximum yield of 5-acetylsalicylamide was 89.2%. The content of AlCl3 and the structure of the cations in the ionic liquids had synergistic effect on the acylation reaction. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Aili Wang,Yiqian Jiang,Weiguang Chen,Yanjun Liu,Yutang Shen,Tingshun Jiang,Zhanao Wu,Hengbo Yin 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Methyltrichlorosilane and low-boiling residue from the synthesis of methylchlorosilanes via the direct reaction of silicon and methyl chloride were effectively converted to high-valued dimethyldichlorosilane catalyzed by 1-butyl-3-methylimidazolium chloroaluminate, [BMIM]Cl-nAlCl3, ionic liquid catalysts. The yield of dimethyldichlorosilane reached 69.1% when the redistribution reaction between methyltrichlorosilane and low-boiling residue was catalyzed by [BMIM]Cl-6AlCl3 at a reaction temperature of 150 8C for 300 min. The conversion of methyltrichlorosilane was 87.8%. And the conversions of tetramethylsilane, methylhydrodichlorosilane, and dimethylhydrochlorosilane present in low-boiling residue were ca. 100%, respectively. The ionic liquids could be recycled efficiently. This research provided an eco-friendly and economical route for the treatment of methyltrichlorosilane and low-boiling residue, which were the by-products in the direct synthesis of methylchlorosilanes. The possible reaction route was also discussed.
Methylation of methyltrichlorosilane with methyl chloride over active metals and activated carbon
Yanjun Liu,Yiqian Jiang,Weiguang Chen,Yutang Shen,Yonghai Feng,Lingqin Shen,Aili Wang,Tingshun Jiang,Zhanao Wu 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.12
Gas phase methylation of methyltrichlorosilane with methyl chloride to high-valued dimethyldichlorosilane was carried out by using metallic aluminum as a chlorine acceptor in the co-presence of activated carbon, tin, and zinc. The addition of activated carbon in metallic aluminum significantly enhanced the methylation of methyltrichlorosilane,and dimethyldichlorosilane was dominantly produced. Activated carbon played a catalyst role in the methylation reaction. When active metals, such as tin and zinc, were added in the mixture of aluminum and activated carbon,the active metals and activated carbon synergistically catalyzed the methylation of methyltrichlorosilane with methyl chloride toward the formation of dimethyldichlorosilane.
Zheng Yanqiong,Peng Junbiao,Tang Jie,Li Weiguang,Chen Juncong,Wang Chao,Zhang Jianhua,Wei Bin,Li Xifeng 한국물리학회 2021 Current Applied Physics Vol.22 No.-
The mixed cohosts of electron transport host (E-host): 4,40-bis(carbazol-9-yl)biphenyl (CBP) have been comparatively investigated for an efficient green fluorescent organic light emitting diode (OLED) doped with a thermally activated delayed fluorescence (TADF) emitter (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN). The E-host:CBP systems significantly enhance the electroluminescent (EL) properties. After doping Ehost, the lifetime of the emissive layer decreases and the surface becomes smoother, together with the impedance decreases for one magnitude and the hole-injection depresses. The charge balance and improved interface both contribute to the EL performance enhancement. Here we develop a universal mixed host system suitable to most of emitters.
Wang Pengzhen,Deng Zhanyu,Li Aiguo,Li Rongsen,Huang Weiguang,Huang Weiguang,Chen Songsheng,Li Biao,Li Biao 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Stem cell therapy has been extensively studied to improve heart function following myocardial infarction; however, its therapeutic potency is limited by low rates of engraftment, survival, and differentiation. Here, we aimed to determine the roles of the β-catenin/Oct4 signaling axis in the regulation of long-term survival and angiogenesis of peripheral blood mesenchymal stem cells (PBMSCs). These cells were obtained from rat abdominal aortic blood. We showed that β-catenin promotes the self-renewal, antiapoptotic effects, and long-term survival of PBMSCs by activating the Oct4 pathway through upregulation of the expression of the antiapoptotic factors Bcl2 and survivin and the proangiogenic cytokine bFGF and suppression of the levels of the proapoptotic factors Bax and cleaved caspase-3. β-Catenin overexpression increased Oct4 expression. β-Catenin knockdown suppressed Oct4 expression in PBMSCs. However, β-catenin levels were not affected by Oct4 overexpression or knockdown. Chromatin immunoprecipitation assays proved that β-catenin directly regulates Oct4 transcription in PBMSCs. In vivo, PBMSCs overexpressing β-catenin showed high survival in infarcted hearts and resulted in better myocardial repair. Further functional analysis identified Oct4 as the direct upstream regulator of Ang1, bFGF, HGF, VEGF, Bcl2, and survivin, which cooperatively drive antiapoptosis and angiogenesis of engrafted PBMSCs. These findings revealed the regulation of β-catenin in PBMSCs by the Oct4-mediated antiapoptotic/proangiogenic signaling axis and provide a breakthrough point for improving the long-term survival and therapeutic effects of PBMSCs.
JIAHUI ZHANG,Lili Zhang,JIN HUANG,Shouyong Zhou,Haiqun Chen,WEIGUANG ZHANG,Xin Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Palygorskite (denoted as Pal) was used as an economical carrier of hybrid photocatalystTiO 2 – FexOy via an in situ depositing technique (marked as Pal – TiO 2 – FexOy). The samples werecharacterized by X-ray di®raction (XRD), transmission electron microscopy (TEM), brunner-emmet-teller (BET) measurements, X-ray photoelectron spectroscopy (XPS) and UV-Vis di®usere°ectance spectra measurements. Results showed that TiO 2 – FexOy composite particles withaverage size of about 10 nm were loaded onto the Pal ¯bers' surface. FexOy acted not only asmagnetic source but also took part in the formation of TiO 2 – FexOy heterojunction structure, which resulted in the obvious absorption in visible light region for the obtained Pal – TiO 2 – FexOy com-posite photocatalyst. The obtained Pal – TiO 2 – FexOy shows excellent photocatalytic activity to-ward photodegradation of Methyl orange (MO) under visible light irradiation and the degradationratio reached 94% within 180 min. Moreover, Pal – TiO 2 – FexOy could be readily recovered from thereaction solution by the magnet. Possible mechanism for the enhancement was also proposed.
Oxidation of cyclopentene catalyzed by phosphotungstic quaternary ammonium salt catalysts
Jinjuan Xue,Aili Wang,Jingbo Wang,Dongzhi Zhang,Weiguang Chen,Longbao Yu,Tingshun Jiang,Hengbo Yin 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.2
A series of phosphotungstic quaternary ammonium salts, Q3 (PW12O40) and Q3(PW4O16) [Q = (C5H5)N+(C16H33), (C16H33)N+(CH3)3, (C4H9)4N+, and (CH3)4N+], were used as the catalysts in oxidation of cyclopentene. The catalysts [(C5H5)N(C16H33)]3(PW4O16) and [(C16H33)N(CH3)3]3(PW4O16) showed high catalytic activity in the selective oxidation of cyclopentene while using H2O2 (50%) as an oxidant and 2-propanol as a solvent. The oxidation products mainly consisted of glutaraldehyde, cis-1,2-cyclopentanediol and trans-1,2-cyclopentanediol. The above-mentioned two catalysts were dissolved completely in the reaction medium during the catalysis process and precipitated themselves from the reaction system after reaction, showing the characteristics of reaction-controlled phase-transfer catalysis. The types of quaternary ammonium cations and the phosphotungstic anions in phosphotungstic quaternary ammonium salts affected catalytic activity.