E，E—1，4—二[2′,2^〃—（苯并恶唑基乙烯基）]苯及衍生物的合成和光性能

合成了E，E－1，4－二[2′,2^〃-（苯并恶唑基乙烯基）]苯及衍生物共14种，测定了它们的熔点、红外光谱、核磁共振氢谱、紫外吸收光谱和荧光发射光谱、荧光量子产率及激光性能。     

Novel Chiral Aminophosphine Ligand:Synthesis and Application in Saymmetric Catalytic Hydrogenation Reaction

A new chiral aminophosphine ligand 6,6′-dimethoxy-2,2′-bis(diphenylphosphinoamino)biphenyl(DMBDPPABP) was prepared and its rhodium complex was found to be an effective catalyst for the asymmetric hydrogenation of amidoacrylic acid and its dervatives.The effects of solvent and reaction temperature on enantioselectivity were also studied.     

Sesquiterpene Lactone Glycosides from Carpesium macrocephalum

Two new sesquiterpene lactone glycosides were isolated from the seeds of Carpesium meacrocephalum. Their structures were elucidated as 2α-O-β-D-glucopyranosy-5α,11αH-eudesma-4(15)-en-12,8β-olide and 2α-O-β-D-glucopyranosy-5αH-eudesma-4(15),11(13)-dien-12,8β-olide by spectral methods (HRMS,1D and 2D NMR).     

Two New C—21 Steroidal Glycosides from Cynanchum aurichulatum

Two new C-21 steroidal glycosides, cynanauriculoside I and cynanauriculoside Ⅱ, were isolated from the roots of Cynanchum aurichulatum. Their structures were established using spectroscopic methods including one and two-dimensional NMR.     

SELECTIVE SEPARATION OF WATER—ETHANOL MIXTURE THROUGH COPOLYMERIC MEMBRANES.Ⅱ.ACRYLONITRILE AND MALEIC ANHYDRIDE COPOLYMERIC MEMBRANES

Acrylonitrile(AN) and maleic anhydride(MA) copolymer has been synthesized by radical polymerization using ammonium persulfate and sodium bisulfite as initiator.The pervaporation properties of the copolymeric membranes prepared have been investigated for the first time. The dependences of pervaporation characteristics on coplymer composition,feed concentration and operating temperature have been studied.In order to improve the separation properties of the copolymeric membranes,the membranes were hydrolyzed with 10 wt% soldium hydroxide or potassium hydroxide aqueous solution.The hydrolyzed membranes containing more than 0.069MA mol fraction showed higher tensile strength and separation properties than the original membranes.     

叔醇脱水成烯反应的溶剂化能力与介电常数的关系

我们用Fe_2(SO_4)_3·xH_2O为催化剂,对2-甲基-2-已醇脱水生成烯烃反应的溶剂化能力及其动力学做了研究,测定了20种不同溶剂中的反应速率常数和以丙至辛6种直链醇为溶剂于不同温度下反应的速率常数,确定了溶剂化能力与溶剂介电常数之间的线性关系。这方面工作尚未见报道。     

微波技术在有机化学反应中的应用

本文介绍了微波技术在干法有机反应、加速有机合成速率及合成短寿命放射性药剂中的应用,概述了微波技术中影响反应速率的因素等,说明了微波特有的能量及快速加热能力在化学反应研究中具有广泛的实际意义。     

Reactions in a Mixture of CH4 and CO2 under the Aciton of Microwave Discharge at Atmospheric Pressure

Reactions between CH4 and CO2 under the action of continuous microwave discharge at atmospheric pressure were studied in a special homemade reactor,The main products were CO and H2,while acetylene and ethylene were also found in the products.Experimental results show that conversions of CH4 and CO2 could be higher than 90% without the presence of any catalyst,Effects of CO2/CH4 molar ratio and total flow rate of the feed gas on the reaction were also investigated.     

铜锌超氧化物歧化酶的金属重组酶的活性部位与组氨酸的相互作用

应用核磁共振和电子自旋共振技术研究了铜锌超氧化物歧化酶（ＣｕＺｎＳＯＤ）的金属重组酶与水溶液中游离组氨酸（Ｈｉｓ）的相互作用。发现在水溶液中ＣｕＺｎＳＯＤ的金属重组酶活性中心的金属可与加入的Ｈｉｓ发生作用而被部分地诱导出来，与Ｈｉｓ形成络合物。     

A Novel Dihydroflavone from the Roots of Uvaria Macrophylla

A new dihydroflavone (1), named macrophyllol A, was isolated from the roots of Uvaria macrophylla. Its structure was elucidated on the basis of spectroscopic evidence.