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2β,3α-Dihydroxyurs-12-en-28-oic acid(6) is a naturally occurring diastereoisomer of corosolic acid with glycogen phosphorylase inhibitory activity.A new strategy for the semi-synthesis of 6 was developed.Using the commercially available ursolic acid(1) as the starting materials,6 was synthesized through five facile reactions with a high stereoselectivity and an overall yield of 47.3%.The structure of 6 was confirmed by optical rotation.ESI-MS,1H NMR and 13C NMR data. 相似文献
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单N-乙酸取代O2N2大环配体及其稀土配合物的合成与表征 总被引:2,自引:0,他引:2
Aseries of new rare earth complexes LnL(NO3)2·2H2O(Ln=La,Pr,Nd,Sm,Eu,Gd,Dy,Yb;L=1,2-diaza-3,4: 9,10-dibenzo-5,8-dioxyacyclopentadecane-N-acetic ion) were prepared. The complexes were characterized by elemental analysis, ICPmethod, IRspectra, 1H NMRand Molar conductance. It was found that the ether oxygen, carboxy oxygen and nitrogen atoms of the ligand are coordinated to the metal ion, as well as a free nitrate and coordianted nitrate ion in the complex. 相似文献
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肼基硫代甲酸酯配合物的合成、晶体结构、光谱及三阶非线性光 学性质研究 总被引:2,自引:0,他引:2
报道三种有推拉电子基团的肼基硫代酸酯衍生物配体(HL^1^~^3)。此类配体与二价过渡金属离子配位时脱去一质子,形成D-M-D和A-M-A(D=给体,M=金属,A=受体)类型、含有共轭体系的中性配合物。本文集中研究了该类配体的镍、铜、钯、铂配合物的IR、磁化率、ESR谱,电子光谱和三阶非线性光学性质,通过光谱研究初步确定了它们均为平面正方形构型配合物,文中还报道了CuL2^1的晶体结构。晶体属P1空间群,a=0.7835(2),b=1.0530(2),c=1.1816(2)nm,α=100.61(3),β=92.38(3),γ=110.00(3)ⅲ,Z=1,最终的R因子为0.063。通过晶体结构测试,进一步确定铜配合物的结构为平面构型。 相似文献
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Based on dislocation theory, we investigate the mechanism of strain rate effect. Strain rate effect and dislocation motion are bridged by Orowan's relationship, and the stress dependence of dislocation velocity is considered as the dynamics relationship of dislocation motion. The mechanism of strain rate effect is then investigated qualitatively by using these two relationships although the kinematics relationship of dislocation motion is absent due to complicated styles of dislocation motion. The process of strain rate effect is interpreted and some details of strain rate effect are adequately discussed. The present analyses agree with the existing experimental results. Based on the analyses, we propose that strain rate criteria rather than stress criteria should be satisfied when a metal is fully yielded at a given strain rate. 相似文献
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四氮杂大环配合物是生物体内一些金属酶结构单元的模拟物,四氮杂大环铜和镍的配合物可以催化化学振荡反应。近年来,此类反应被广泛地研究[1~4]。目前已报道的作为化学振荡反应催化剂的四氮杂大环配合物的配体都是单环。我们发现一种双四氮杂大环镍(Ⅱ)配合物Ni2L(ClO4)4[L为双(11,13二甲基1,4,7,10四氮杂10,13环十三二烯12亚甲基)]可以作为化学振荡反应的催化剂,本文研究了Ni2L(ClO4)4催化NaBrO3CH2(COOH)2(MA)H3PO4体系的化学振荡反应。1实验部分实验试剂:丙二酸… 相似文献