Results 101 to 110 of about 1,622,791 (143)

手性联萘二苯基磷功能化的介孔材料及其制备和应用

, 2010
本发明涉及一种制备手性联萘二苯基磷功能化介孔材料的方法。该材料以非离子型共聚物P123为结构导向剂，醇为共溶剂，氯化钠和氟化铵为添加剂，在弱酸性条件下以有机硅氧烷(R)-5，5-二(3-乙氧基硅基丙基-1-亚脲基)-联萘二苯基氧磷和正硅酸甲酯作为硅源通过共缩聚方法合成。经过六甲基硅胺烷处理和三氯硅烷的还原，即可得到手性联萘二苯基磷功能化杂化介孔材料。该材料与金属钌结合以后是不对称氢化的有效催化剂，在酮类底物不对称氢化的反应中具高的催化活性和手性选择性(92～99％ee)，并可以进行多次的循环使用 ...
王培远, 杨启华
core  

[Research progress on ionic liquid-functionalized magnetic Fe₃O₄ nanomaterials in sample pretreatment- chromatographic analysis]. [PDF]

Se Pu
Li JX, Zhao LZ, Sun XM, He ZQ, Cao HL, Luo YJ, Yang B.   +6 more
europepmc   +1 more source

铁促进O,O-缩醛和烯基S,S-缩醛参与的环化与烯基化研究

, 2014
本文系统地研究了铁盐被用于缩醛的C–O键以及烯烃的C=C键活化形成新的C–C键的反应。 研究了三氯化铁和三溴化铁促进的炔丙基胺类化合物与苯甲醛二乙基缩醛环化反应，一步形成三个新的碳碳键，较高收率得到四环5-对甲苯磺酰基-6,7-二氢-5H-茚并[2,1-c]喹啉产物。7H-茚并[2,1-c]喹啉产物在催化量三氯化铁作用下最高收率可以达到89%。分离出的反应中间产物印证了反应机理，认为反应中涉及到碳芳基化/Nazarov环化序列。此方法为合成多环杂环化合物提供了新的途径 ...
杨琴
core  

[Preparation of magnetic bifunctional materials for exosome capture from serum and phosphopeptide enrichment]. [PDF]

Se Pu
Wang ZR, Zheng HJ, Jia Q.
europepmc   +1 more source

[Determination of 51 per- and polyfluoroalkyl substances in raw water and drinking water by online solid-phase extraction coupled with ultra performance liquid chromatography- tandem mass spectrometry]. [PDF]

Se Pu
Chen YY, Lyu J, Ye BX, Zhang L, Wang YY, Jin N.   +5 more
europepmc   +1 more source

[Application of molecularly imprinted polymers-based sensors for determination of acute coronary syndrome biomarkers]. [PDF]

Se Pu
Zhang Y, Xia J, Zhu J, Zeng M, Bai J, Xu Q, Gao H.   +6 more
europepmc   +1 more source

[Deep eutectic solvent and improved needle filter-based liquid-membrane microextraction combined with high performance liquid chromatography for the determination of sulfonamide and fluoroquinolone residues in milk]. [PDF]

Se Pu
Xu RM, Wu YY, Gu ZH, Wei W, Lu XY, Xia ZH.   +5 more
europepmc   +1 more source

[Petroleum ether fraction of <i>Myrica nana</i> roots relieves spasmodic abdominal pain in mice by inhibiting intestinal smooth muscle spasm]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Yang S, Chen W, Chen X, Tian K, Xiong Y, Sun J, Huang L, Huang X, Wang Z.   +8 more
europepmc   +1 more source

[Determination of 26 herbicide residues in soil， sediment， and surface water samples using modified QuEChERS method combined with ultra-high performance liquid chromatography-tandem mass spectrometry]. [PDF]

Se Pu
Zhao L, Ma L, Huang LQ, Chen JB, Zhu WF.
europepmc   +1 more source

[Simultaneous determination of vitamins K₁ and K₂ in cosmetics by QuEChERS-high performance liquid chromatography and verification by high performance liquid chromatography-tandem mass spectrometry]. [PDF]

Se Pu
Sun Q, Chen CX.
europepmc   +1 more source