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RISS 인기검색어
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- 저자 : Yiqian Jiang (검색결과 4 건)
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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.
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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.
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Yujun Fu,Hengbo Yin,Yiqian Jiang,Lingqin Shen,Yonghai Feng,Aili Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Methylchlorophenyldichlorosilane (MeClPhSiCl2) and methyldichlorophenyldichlorosilane (MeCl2Ph-SiCl2) were synthesized by the catalytic chlorination of methylphenyldichlorosilane (MePhSiCl2) withCl2 over Lewis acid catalysts. The catalytic activities of Lewis acid catalysts were in an order ofFeCl3 > SbCl5 > AlCl3 > SnCl4. However, FeCl3 also highly catalyzed the cleavage of chlorophenyl–siliconbond to form chlorobenzene. At a low mole ratio of SbCl5 to MePhSiCl2 of 1.4 × 10-5:0.45, the yield ofMeClPhSiCl2 was around 60% after reacting at 25–100 8C for 15–20 h. At a high mole ratio of1.4 × 10-4:0.45, the yield of MeCl2PhSiCl2 reached 44% after reacting at 80–100℃ for 20 h.
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Theaflavin indicates protection on vascular endothelium via hydrogen sulfide production
Lee WonJune,Terada Tomoko,Jiang WenQian,Zhang YiQian,Miyazaki Hitoshi,Yoshida Shigek 대한독성 유전단백체 학회 2024 Molecular & cellular toxicology Vol.20 No.3
Background Tea polyphenols have different beneficial effects on vascular endothelium through the controlled production of nitric oxide (NO), regulation of cell proliferation, and antioxidant system. Recently, hydrogen sulfide (H2S) has been proposed as the gaseous signaling molecule in the vascular endothelium. In this study, we investigated the differences in biological functions with tea polyphenols through NO and H2S production in vascular endothelium. Objective Providing high potential therapeutic effect on vascular endothelium with theaflavin. Results Theaflavin significantly stimulated H2S production in vascular endothelial cells (VECs) by 1.51-fold compared to the control, while EGCG showed no effect. Both EGCG and theaflavin increased NO production (1.63 and 2.16-fold vs control), eNOS (1.45- and 1.74-fold vs control), p-eNOS (1.41-, 2.01-fold vs control), wound healing (1.30- and 1.75-fold vs control), and oxidative stress-induced reduction of cell viability (89.0 and 94.0% vs control). The potency of theaflavin was found to be higher than that of EGCG. Upon treatment with 100 μM DL-propargylglycine (PPG) to inhibit cystathionine-γ-lyase activity, all cell responses were suppressed in both EGCG and theaflavin treatments, and the reduction rate in the theaflavin treatment was higher than that of the control and EGCG treatments in all responses. Conclusion These results indicate that the protective effect of VECs is dependent on NO production and that both EGCG and theaflavin have therapeutic potential for VECs. Theaflavin has a relatively higher therapeutic potential than EGCG due to its ability to increase H2S production, which in turn affects NO production and biological activity. Background Tea polyphenols have different beneficial effects on vascular endothelium through the controlled production of nitric oxide (NO), regulation of cell proliferation, and antioxidant system. Recently, hydrogen sulfide (H2S) has been proposed as the gaseous signaling molecule in the vascular endothelium. In this study, we investigated the differences in biological functions with tea polyphenols through NO and H2S production in vascular endothelium. Objective Providing high potential therapeutic effect on vascular endothelium with theaflavin. Results Theaflavin significantly stimulated H2S production in vascular endothelial cells (VECs) by 1.51-fold compared to the control, while EGCG showed no effect. Both EGCG and theaflavin increased NO production (1.63 and 2.16-fold vs control), eNOS (1.45- and 1.74-fold vs control), p-eNOS (1.41-, 2.01-fold vs control), wound healing (1.30- and 1.75-fold vs control), and oxidative stress-induced reduction of cell viability (89.0 and 94.0% vs control). The potency of theaflavin was found to be higher than that of EGCG. Upon treatment with 100 μM DL-propargylglycine (PPG) to inhibit cystathionine-γ-lyase activity, all cell responses were suppressed in both EGCG and theaflavin treatments, and the reduction rate in the theaflavin treatment was higher than that of the control and EGCG treatments in all responses. Conclusion These results indicate that the protective effect of VECs is dependent on NO production and that both EGCG and theaflavin have therapeutic potential for VECs. Theaflavin has a relatively higher therapeutic potential than EGCG due to its ability to increase H2S production, which in turn affects NO production and biological activity.
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