手性液晶的研究——Ⅴ.对光活性的酰氧基苯甲酸酯类和酰氧基苯酚酯类

合成了文题所述化合物,四类,19个。经元素分析、质谱和红外光谱确证了其分子结构,并测定了它们的相变温度,确定了其液晶相类型。再由电滞回线测定,证明MHxOPNB等七个化合物是新型铁电液晶,其S_C~*相范围接近室温。增长化合物末端基团,有利于液晶相的形成;增长手性基团的碳链,则有利于S_C~*相的形成,并增加液晶的相变宽度。     

3 1维格点QCD的手征对称性自发破缺

把纯规范场的严格基态和费米场的变分真空态结合起来,研究3 1雏SU(2)、SU(3)群的真空结构,给出费米子真空凝聚〈ΨΨ〉与1/g~2的关系。     

含手性原子的希夫碱系化合物的合成及SHG效应

合成了含手性原子的中间体及六个希夫碱，测试工了旋光度和吸收光谱，含手性原子的化合物均有旋光值。所合成的样品最大吸收波长λｍａｘ为３２９．３－３７２．８ｎｍ。     

Recent Advances in Protein Extraction and Chiral Separation of Blomolecules

Reverse micelles create unique environment in organic media. They are capable of solubilizing hydrophilic biomolecules （e.g., proteins, peptides, amino acids, and DNAs） in their aqueous interior. This feature brings about the practical use of biomaterials in organic media because reverse micelles solubilize them with the intrinsic activity. In this paper, we focus on recent two topics concerning protein extraction and chiral separation of biomolecules using liquid membranes. In the first topic, we present recent attempts to extract proteins from an aqueous solution into isooctane using reverse micelles, and some important operational parameters to achieve an efficient protein transfer are discussed. Furthermore, novel function of reverse micelles as a protein activation medium is introduced. In the reverse micellar phase, denatured proteins were completely reactivated in the reverse micellar solution. The reverse micellar technique is found to be a useful tool not only for protein separation but also for protein refolding. Furthermore, we found that a cyclic ligand carixarene has an extraction ability to set up optimum conditions for protein transfer. In the second topic, we have found that a supported liquid membrane （SLM） encapsulating enzymes shows high enantioselectivity （enantioselective excess value is over 96%） in the transport of racemic pharmaceutical compound ibuprofen. A different experiment also suggests that the α-chymotrypsin-catalyzed reactions droved the enantioselective transport of L-phenylalanine based on the enantioselectivity of the enzyme. The SLM encapsulating the surfactant-enzyme complex enabled the highly enantioselective separation of racemic mixtures. It can be envisioned that arrangement of appropriate enzymes in the SLM system will allow enantioselective separation of various useful organic compounds.     

手性膦配体催化剂在不对称氢化中的应用研究

本文详细介绍了手性膦配体催化剂对不饱和C=C键、C=N键、C=O键的不对称氢化的催化反应,并提出了研究手性膦配体催化剂的方向和存在的主要问题.     

手性相转移催化剂合成及其不对称诱导效应--Ⅲ.手性双季铵盐的合成与研究

以氯霉素为原料，经水解、双叔胺化、双季铵化合成了光学纯二溴化(-)-N，N’-二(1-对硝基苯基-1，3-二羟基二2-丙基）-N，N，N‘，N’-四甲基-1，6-己二铵，作为相转移催化剂，它对苯乙腈α-甲基化、苯甲醛与氯仿的亲核加成的催化作用和不对称诱导效应均优于单季铵盐．     

樟脑型β-二羰基化合物的合成

 天然樟脑在-83℃条件下与苯甲醛的羟醛缩合产物经过Swern氧化得到手性β-二羰基化合物.     

手性分子研究的过去、现在与未来——2001年诺贝尔化学奖深远意义剖析

通过回顾手性分子研究的过去、结合2001年诺贝尔化学奖介绍了手性分子研究的现状,分析展望了手性分子研究的未来广阔前景.     

利用不同手性固定相对DL-氨基酸衍生物对映体手性分离

利用三种手性固定相对６种Ｎ－乙酰化ＤＬ－氨基酸酯进行了手性分离研究,结果表明：Ｎ－乙酰化ＤＬ－氨基酸酯的手性分离系数α随氨基酸手性中心基团Ｒ１和衍生化基团Ｒ２的增大而增大,同时ＣＳＰ具有手性识别的手性中心基团空间位阻的增大也有利于改善手性分离效果,对映体的馏出顺序取决于ＣＳＰ具有手性识别的手性中心的构型,本文还为已提出的Ｎ－乙酰化ＤＬ－氨基酸酯在该类手性固定相上的手性分离机理进行了补充．     

Ionic Liquids Derived New Media for from the Chiral Pool： Fine Chemistry

Ionic liquids （Ils） are low melting point salts, which are characterized by properties such as high ability to dissolve organic, organometallic and even inorganic compounds, absence of flammability, lack of measurable vapour pressure and high thermal stability. Due to these peculiar properties, they have recently attracted considerable attention as greener alternatives to volatile organic solvents. A few chiral ionic liquids, which could provide a renewal in the field of chiral solvents, have also been reported recently. Herein, we will present the synthesis of a new family of ionic liquids based on a thiazolinium skeleton. Preliminary results on the use of these chiral ionic liquids in the field of chiral recognition and organic synthesis will also be reported.