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961.
Hans‐Ruedi Mürner Rosario Scopelliti Jean‐Claude G. Bünzli 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(8):m434-m435
In the title compound, [TbCl(C27H35N3)2(H2O)](ClO4)2·2C2H6O, the TbIII ion has a coordination number of eight, composed of two tridentate substituted‐terpyridine ligands, a water molecule and a bound Cl? anion. The first coordination shell can be described as a distorted bicapped trigonal prism. The dihedral angles between pyridine rings belonging to the same tpy ligand range from 5.2 (5) to 16.8 (5)°. 相似文献
962.
963.
Two new esters, methyl 4‐(prenyloxy)dihydrocinnamate and methyl 4‐(geranyloxy)dihydrocinnamate, together with fourteen known compounds have been isolated from the stem bark of Zanthoxylum pistaciiflorum. The structures of two new compounds were determined through spectral analyses. Among the isolates, four compounds exhibited effective cytotoxicities against P‐388 and HT‐29 cell lines in vitro. 相似文献
964.
壳多糖与丙烯酸丁酯的乳液接枝共聚研究 总被引:10,自引:0,他引:10
以十二烷基苯磺酸钠为乳化剂,过硫酸钾-亚硫酸氢钠为引发剂,研究了壳多糖与丙烯酸丁醋的乳液共聚合,结果表明当[K2S2O8]=[NaHSO3]=2.57×10-3mol·1-1,[BA]=0.68mol.1-1,[Chitosan]=19.2g·l-1,在70℃下反应5小时,共聚反应的接技率和接枝效率均较高.用红外光谱,差热分析,X射线衍射,扫描电镜对接技共聚物进行了表征,此外测试了共聚物胶乳成膜的机械性能,表明用丙烯酸丁酯对壳多糖进行接枝改性,可提高壳多糖的韧性,扩大其应用范围. 相似文献
965.
966.
Macrocycle-mediated transport of Eu3+ and Eu2+ from an aqueous solution through a modified thin-sheet-supported liquid membrane has been studied and compared with that of Sr2+, Gd3+ and Nd3+. Transport of Eu2+ was found to be more effective than that of trivalent lanthanide cations using bis (1-hydroxylheptyl)DC18C6 as the membrane carrier. The flux of Eu2+ was similar to that of Sr2+ while those of Eu3+, Gd3+ and Nd3+ were almost identical and much less than that of Sr2+. 相似文献
967.
利用火焰原子吸收法直接测定羊睾丸,梅花鹿胎盘提取液中铅的含量,实验结果表明,两种提以液中均含有铅,梅花鹿胎盘提取液铅含量低于羊睾丸,透析液组高于超滤液组,这一结果为合理开发利用羊睾丸,梅花鹿胎盘提取液提供一定的数据。 相似文献
968.
The cover picture shows a typical building within the Campus of Xiamen University displaying Chen Jiageng (Tan Kah Kee)'s style. Just like many beautiful buildings designed and constructed by human, Nature “designs and constructs” a huge number of useful molecules with fascinating structures called natural products. Many natural products possess a fused six or seven‐membered carbocyclic unity. On page 315–322, the Huang's group disclosed a three‐step “[2+n]” annulation method for the construction of fused six and seven‐membered carbocyclic enimines and enones. The method starts from simple cyclic ketones and terminal olefinic amides, and relies on both the Suzuki coupling reaction and the olefin‐amide based Friedel‐Crafts type acylating reaction, a method developed by Huang and coworkers.
969.
Dorota Gryko DanielT. Gryko Hanna Sierzputowska‐Gracz Piotr Piatek Janusz Jurczak 《Helvetica chimica acta》2004,87(1):156-166
The efficient synthesis of eight new macrocyclic amides (lactams) via reaction of diesters with diamines under normal dilution conditions is described. The role of intermolecular H‐bond formation and steric hindrance is discussed based on 1H‐ and 15N‐NMR studies of appropriate model compounds. Principles for the optimal choice of esters that can be efficiently transformed into diamides have been developed. 相似文献
970.
Polymer colloids based on 3‐O‐methacryloyl‐1,2:5,6‐di‐O‐isopropylidene‐α‐D ‐glucofuranose (3‐MDG) and butyl acrylate (BA) were prepared via free radical mini‐emulsion polymerization. The kinetic and colloidal features of the copolymerization were investigated. The final particle size (D) of the sugar latexes is inversely proportional to the concentration of the anionic emulsifier (sodium dodecyl sulphate, SDS) and the non‐ionic one (alkyl polyglucoside, APG). It was also found that D is independent of the concentration of either the water‐soluble initiator (potassium persulfate, KPS), or the oil‐soluble initiator (2,2′‐azobisisobutyronitrile, AIBN). The rate of mini‐emulsion polymerization is lower in comparison with the conventional emulsion polymerization under the same conditions. The polymerization rate (Rp) and the total number of particles (Np) are proportional to the 0.72th and 0.93th power of the SDS, and to the 1.40th and 2.22th of the APG concentration. Following reaction orders, 0.79/0.06 were obtained for Rp/Np versus the concentration of KPS, and 0.22/?0.01 for AIBN, respectively. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献