Two cobalt(Ⅱ) complexes 1 and 2 of Schiff bases derived from amino acids were synthesized and used for oxidation of benzyl alcohol with molecular oxygen at different conditions of pH,solvent,temperature and complex...Two cobalt(Ⅱ) complexes 1 and 2 of Schiff bases derived from amino acids were synthesized and used for oxidation of benzyl alcohol with molecular oxygen at different conditions of pH,solvent,temperature and complex/alcohol molar ratio to optimize reaction conditions and to evaluate the catalytic efficiency of new cobalt Schiff base complexes.Under obtained optimum conditions,various alcohols were oxidized to corresponding aldehydes and ketones.展开更多
A new chiral β-diketone Cu (Ⅱ) catalyst was synthesized and used for the asymmetric cyclopropanation of styrene with diazoester. A high optical yield (~90%) was achieved. The effect of the structure of substrate on ...A new chiral β-diketone Cu (Ⅱ) catalyst was synthesized and used for the asymmetric cyclopropanation of styrene with diazoester. A high optical yield (~90%) was achieved. The effect of the structure of substrate on the enantioselectivity was studied. Both chendcal yield and optical yield being reduced when the steric bulky substrate was employed. The reaction mechanism and the chiral model of the transition state are under fufther investigation.展开更多
Three ruthenium(II)complex catalysts bearing2,6‐bis(tetrazolyl)pyridine were synthesized,structurally characterized,and applied in the transfer hydrogenation of ketones.Their different catalytic activities were attri...Three ruthenium(II)complex catalysts bearing2,6‐bis(tetrazolyl)pyridine were synthesized,structurally characterized,and applied in the transfer hydrogenation of ketones.Their different catalytic activities were attributed to the different phosphine ligands on the4‐chloro‐2,6‐bis(1‐(p‐tolyl)‐1Htetrazol‐5‐yl)pyridine ruthenium(II)complexes,with that based on1,4‐bis(diphenylphosphino)butane exhibiting better catalytic activity.A variety of ketones were reduced to their corresponding alcohols with>95%conversion.展开更多
目的研究丹参酮ⅡA对血小板及骨髓巨核细胞的影响,探讨其抗血小板作用与其对骨髓巨核细胞影响的关系,了解丹参酮ⅡA是否对免疫性血管炎血管损害有保护作用。方法建立免疫性血管炎模型,实验分为正常对照组、模型对照组和丹参酮ⅡA治疗组...目的研究丹参酮ⅡA对血小板及骨髓巨核细胞的影响,探讨其抗血小板作用与其对骨髓巨核细胞影响的关系,了解丹参酮ⅡA是否对免疫性血管炎血管损害有保护作用。方法建立免疫性血管炎模型,实验分为正常对照组、模型对照组和丹参酮ⅡA治疗组,检测外周血血小板数量,同时检测巨核细胞的数量和功能(CFU-MK集落形成能力)以及基质细胞集落(CFU-F)形成能力,HE染色、弹力纤维染色及电镜观察血管病理改变。结果免疫性血管炎模型对照组有血小板数量、骨髓巨核细胞数、CFU-MK数的明显增加。丹参酮ⅡA治疗能够明显抑制血小板,血小板数量由模型组的931.33±254.19×109/L降至544.00±83.88×109/L(P<0.05)。也能明显抑制骨髓巨核细胞数和CFU-MK,分别为29.17±8.40个/片vs 17.67±5.75个/片(P<0.05)和33.0±14.27个/2×105cells vs 14.67±3.67个/2×105cells(P<0.05)。还能抑制骨髓基质细胞,CFU-F数由58.7±14.5个/2×106cells vs 38.8±11.09个/2×106cells(P<0.05)。丹参酮ⅡA治疗后血管炎的病理损害有明显减轻。结论丹参酮ⅡA可抑制血小板和骨髓巨核细胞的数量,对骨髓巨核细胞和基质细胞的抑制可能是丹参酮ⅡA抑制血小板功能的作用机理之一。丹参酮ⅡA可能通过抑制血小板和巨核细胞而减轻炎症损害,从而使免疫性血管炎血管免受损害而达到治疗目的。展开更多
文摘Two cobalt(Ⅱ) complexes 1 and 2 of Schiff bases derived from amino acids were synthesized and used for oxidation of benzyl alcohol with molecular oxygen at different conditions of pH,solvent,temperature and complex/alcohol molar ratio to optimize reaction conditions and to evaluate the catalytic efficiency of new cobalt Schiff base complexes.Under obtained optimum conditions,various alcohols were oxidized to corresponding aldehydes and ketones.
文摘A new chiral β-diketone Cu (Ⅱ) catalyst was synthesized and used for the asymmetric cyclopropanation of styrene with diazoester. A high optical yield (~90%) was achieved. The effect of the structure of substrate on the enantioselectivity was studied. Both chendcal yield and optical yield being reduced when the steric bulky substrate was employed. The reaction mechanism and the chiral model of the transition state are under fufther investigation.
文摘Three ruthenium(II)complex catalysts bearing2,6‐bis(tetrazolyl)pyridine were synthesized,structurally characterized,and applied in the transfer hydrogenation of ketones.Their different catalytic activities were attributed to the different phosphine ligands on the4‐chloro‐2,6‐bis(1‐(p‐tolyl)‐1Htetrazol‐5‐yl)pyridine ruthenium(II)complexes,with that based on1,4‐bis(diphenylphosphino)butane exhibiting better catalytic activity.A variety of ketones were reduced to their corresponding alcohols with>95%conversion.
文摘目的研究丹参酮ⅡA对血小板及骨髓巨核细胞的影响,探讨其抗血小板作用与其对骨髓巨核细胞影响的关系,了解丹参酮ⅡA是否对免疫性血管炎血管损害有保护作用。方法建立免疫性血管炎模型,实验分为正常对照组、模型对照组和丹参酮ⅡA治疗组,检测外周血血小板数量,同时检测巨核细胞的数量和功能(CFU-MK集落形成能力)以及基质细胞集落(CFU-F)形成能力,HE染色、弹力纤维染色及电镜观察血管病理改变。结果免疫性血管炎模型对照组有血小板数量、骨髓巨核细胞数、CFU-MK数的明显增加。丹参酮ⅡA治疗能够明显抑制血小板,血小板数量由模型组的931.33±254.19×109/L降至544.00±83.88×109/L(P<0.05)。也能明显抑制骨髓巨核细胞数和CFU-MK,分别为29.17±8.40个/片vs 17.67±5.75个/片(P<0.05)和33.0±14.27个/2×105cells vs 14.67±3.67个/2×105cells(P<0.05)。还能抑制骨髓基质细胞,CFU-F数由58.7±14.5个/2×106cells vs 38.8±11.09个/2×106cells(P<0.05)。丹参酮ⅡA治疗后血管炎的病理损害有明显减轻。结论丹参酮ⅡA可抑制血小板和骨髓巨核细胞的数量,对骨髓巨核细胞和基质细胞的抑制可能是丹参酮ⅡA抑制血小板功能的作用机理之一。丹参酮ⅡA可能通过抑制血小板和巨核细胞而减轻炎症损害,从而使免疫性血管炎血管免受损害而达到治疗目的。