Synthesis and Crystal Structure of 3-（Trichloroacetyl） Indole

1 INTRODUCTION Indole and its derivatives have attracted much at-tention due to their chemical properties as well asbiological activities[1, . They have been widely used 2]as the materials for producing pigment, perfume,plant growth regulators, etc. Recently, it has alsobeen found that some indole derivatives present anti-tumor and antiviral activities[3～5]. During our sear-ches for bioactive compounds, a series of indole deri-vatives were synthesized, among …     

网胰藻Hydroclathrus clathratus的化学成分研究

报道从中国南海网胰藻Hydroclathrus clathratus中分离得到3个单体化合物,经过MS,IR,1HNMR,13CNMR(DEPT),HMQC和HMBC等波谱技术鉴定为:(6R,7aS)-6-羟基-4,4,7a-三甲基-2,4,5,6,7,7a-六氢苯并呋喃-2-酮(1),1-(2-脱氧-β-D-呋喃核糖)-5-甲基-1,2,3,4-四氢嘧啶-2,4-二酮(2),尿嘧啶(3),并通过X射线单晶衍射实验确定化合物1的立体结构,其中化合物1是首次从自然界中分离得到.     

苏州荠苧总黄酮与微量元素含量的测定

采用分光光度法测定了苏州荠芋的总黄酮含量；采用了等离子发射光谱法测定了其元素含量。结果表明，苏州荠芋总黄酮的含量分别为55．31mg/g(7月采收)、65．00mg/g(8月采收)；含K、Ca、Mg等多种常量元素；含Cu、Fe、Mn、Zn、Cr、Co等多种人体必需的微量元素，其中Fe含量最高；而有害重金属元素Hg未检出，Pb和AS的含量均较低(小于药典规定量)。可见8月采收的苏荠芋总黄酮含量较高，苏州荠芋含多种人体必需的微量元素，有害重金属含量低，具有较大的开发价值。     

多组分体系同时定性定量测定的逐步回归分析法

阐述了逐步回归分析法用于多组分体系同时定性定量分析的原理、实验及数据处理方法。分析了硝基酚类人工样、未知样及合成样。该法可用于仅知可能含有的组分范围的样品分析。     

温度和压力对六氟二酐型聚酰亚胺的透气性能的影响

本文研究了温度和压力对五种六氟二酐（６ＦＤＡ）型聚酰亚胺膜对Ｈ_２、ＣＯ_２、Ｏ_２、Ｎ_２和ＣＨ_４五种气体透过性能的影响．在３０－１００℃区间，五种聚酰亚胺的透气系数与温度的关系均符合Ａｒｒｈｅｎｉｕｓ关系式；在０．３－１．２ＭＰａ区间，压力对透气系数的影响很小．６ＦＤＡ－４，４＇－二氨基二苯酮（ＤＡＢＰ）和６ＦＤＡ－３，３＇－二甲基二苯甲烷二胺（ＤＭＭＤＡ）在１００℃仍然具有较大的透气选择系数，是比较好的气体分离膜材料．     

聚甲基丙烯酸4［（4＇－硝基－1＇硫酰基苯）－1－羟烷氧基本基］酯的合成

new series of sulfur-contalning side chain liquid crystalline polymers were described. Mesomorphic side chains with methylene spacer in different length have been synthesized and their structures were identified by NMR, IR and MS.The liquid crystalline nature of the polymers was characterlzed by microscopy.The Polymers have liquid crystalline nature.     

The Surface Imprinted Polystyrene Beads Prepared via Emulsion Templates

In this paper, the surface imprinted cross-linked polystyrene beads were prepared via suspension polymerization with styrene (St), divinylbezene (DVB), polyvinyl alcohol (PVA1788),the mixture of Span 85 and xylene or the mixture of Span 85 and paraffin as monomer,cross-linking agent, dispersion stabilizer and templates, respectively. The results indicate that there are dense cavities on the surface of beads, and the diameter and density of cavity are related with the composition and amount of emulsion template. The forming mechanism of cavity from thermodynamics and dynamics was proposed.     

Transient Absorption Spectral Characterization of Electron Transfer between Fullerenes (C_(60)/C_(70)) and N,N,N′,N′-Tetra(p-methylphenyl)-4,4′-diamino-1,1′-diphenyl Sulphide (TPDAS)

Ｏｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔａｉｍｓｏｆｐｈｏｔｏｃｈｅｍｉｓｔｒｙｉｓｔｈｅｄｅｓｉｇｎａｎｄｃｏｎｓｔｒｕｃｔｉｏｎｏｆｍｏｌｅｃｕｌａｒｄｅｖｉｃｅｓｆｏｒｅｎｅｒ ｇｙｃｏｎｖｅｒｓｉｏｎａｎｄｉｎｆｏｒｍａｔｉｏｎｐｒｏｃｅｓｓｉｎｇ .Ｔｈｅｐｈｏｔｏａｃｔｉｖｅｍｏｌｅｃｕｌａｒｄｅｖｉｃｅｓａｒｅｂａｓｅｄｏｎｔｈｅｐｈｏｔｏｉｎｄｕｃｅｄｅｌｅｃｔｒｏｎｔｒａｎｓｆｅｒｂｅｔｗｅｅｎｄｏｎｏｒ ａｃｃｅｐｔｏｒｔｙｐｅｏｒｇａｎｉｃｃｏｍｐｏｕｎｄｓａｎｄａｃｃｅｐｔ…     

高分子量的枝状聚硅烷的合成与表征

根据硅氢加成反应机理设计了“顺点滴式”工艺 ,高效、低耗地合成了甲基苯乙基二氯硅烷和甲基正己基二氯硅烷 .根据Wurtz还原偶联反应原理 ,采用“预聚”和“混聚”两种工艺分别合成枝状共聚硅烷 ,发现运用“预聚”工艺可以合成分子量很高的枝状聚硅烷 .     

Chemoenzymatic Synthesis of Cellular Adhesion Tripeptide RGD Precursor in Organic Media

IntroductionA characteristic tripeptide sequence Arg-Gly-Asp(RGD) that is found within fibronectin and other rela-ted adhesion molecules in extracellular matrices(ECM)has received considerable attention from researcherssince it was proved to be a recognit…