Oxyfunctionalization of ketones bearing α-methylene group with piperidine oxoammonium salt.Synthesis of α-diketones from monoketones

A facile method for the title transformation is described. The reaction of 2,2,6,6-tetramethyl-4-methoxypiperidine oxoammonium chloride (1b) and ketones bearing a-methylene group in acetonitrile proceeded smoothly to give the a-oxyfunctionalized coupling products (6a-h). These coupling products decomposed upon heating in acidic medium to produce a-diketones (7a-h) in good to excellent yields.     

等离子体引发聚合制备梳形聚醚及其锂盐络合物的离子电导性

等离子体引发聚合甲基丙烯酸甲氧基多缩乙二醇酯制备梳形聚醚的收率及组成不仅取决于等离子体功率、放电时间、后聚合温度和时间等条件,而且对溶剂种类和单体浓度有强烈的依赖性。所得聚合物的凝聚态结构与自由基引发聚合的产物基本相同,但聚合度更高且具微交联,从而导致其力学性能改善,并为添加增塑剂以提高其锂盐络合物的离子电导性创造了条件。     

反相高效液相色谱分离果酸的研究

水果和蔬菜中含有的有机酸,称谓果酸,果酸的定量方法很多,气相色谱法需要将果酸衍生后才能分析。本文阐述用反相高效液相色谱及紫外与示差折光检测器,流动相为0.01M(NH_4)_2HPO_4,用H_3PO_4调节pH值为2.5,使果酸得到分离。用保留时间定性,用标准酸样的直线方程进行定量。并对橙子中的柠檬酸、健力宝饮料中的酒石酸作了定量测定。回收率达90%以上。此法快速,分离效果较好,是食品生产与分析发展的趋势。     

辐照聚苯乙烯溶胶性质的SEC—LALLS法研究

聚苯乙烯是一种耐辐照的通用高分子材料。用其它方法来表征其微观反应参量,辐照剂量需要很大,周期长,而用SEC-LALLS法,则仅需凝胶点前知识,相应需要时间短,有关这方面的研究工作还未见文献详细报导。     

长链脂肪酸稀土络合体系的光致发光现象研究

本文合成了两烯长链脂肪酸和铕的二元配合物，进而以邻菲罗淋作为第二配体制得三元配合物，是很好的光致发光物质，元素分析及FTIR光谱初步确定了结构，分别为Eu(L1)32H2O,Eu(L1)3phen,Eu(L2)32H2O,Eu(L2)3phen(L1=月桂酸根、L2=硬脂酸根），长链脂肪酸通过羧酸双齿螯合配位，运用紫外吸收光谱和荧光光谱进一步讨论其发光机理。通过TEM电镜研究了配合物掺杂在高分子中的形貌与颗粒大小等分布情况。     

丙烯酸酯系水乳漆的螯合固化

本文研究了含螯合单体2-AAEMA的丙烯酸酯共聚物乳漆的窒温螯合交联,用~1H-NMR测定了共聚物中2-AAEMA的含量,IR研究了螯合交联物的结构;比较了五种金属盐(M~(2 ))和不同2-AAEMA含量的共聚物乳液的实际交联效果,并测定了固化产物的交联程度、漆膜耐水性、硬度和力学性能。     

Synthesis and Characterization of Novel Multifunctional Acylthiourea Polymers

Several thiourea polymers have been synthesized through the reaction of diamine with 1, 4-or 1, 3-benzenedicarbonyl chloride and ammonium thiocyanate by solid-liquid phase transfer catalysis of polyethylene glycol-400 (PEG-400). The polymers were characterized and identified by elemental analysis, IR, HNMR and GPC. The multifunctional polymers have potential value as an ideal support for immobilized enzymes.     

Trihydrated Complex of Tetrabenzimidazole Copper（ Ⅱ ） Sulfate

IntroductionBenzimidazole is an interesting heterocyclicring because it is present in various natural occur-ring drugs such as omeprazole,astemizole andemedastine difumarate[1] .The efficacy of substitu-ted benzimidazoles in the treatment of parasitic in-fections is well known[2 _ 4] .Substituted benzimida-zole moieties are the established pharmacophores inparasitic chemotherapy. Bis( 2 - benzimidazoles) andsome substituted bis( 2 - benzimidazolyl) alkaneshave attracted much attention of some …     

COMPATIBILITY OF POLY (STYRENE-B-2-VINYL PYRIDINE)/IONOMER BLENDS BASED ON ION-LIGAND INTERACTION

1. INTRODUCTION The blending of polymers is an economically viable and versatile way in which new materials can be produced to have a wide range of properties. The majority of polymers are immiscible at the molecular level as given by laws of thermodynami…     

Energy relationship and the polarization of C_(60) cage in the endohedral complexes (X@C_(60))

In this paper, we carry out the calculation on the system (X@C60)(X=Li, Na, K, Kb, Cs; F, Cl, Br, I), where the position of X changes along 5 typical symmetry directions. For the calculation of quantum chemistry we use EHMO/ASED method, for the calculation of molecular mechanics we use Buckingham potential (exp-6-1) function, and for the calculation of thermo-chemical cycle we use individually isolating the processes such as the structure variation, charge transfer and charge distribution, and their interactions etc. The calculation results show that (1) In the region of radius r≈0.2 nm of the Ceo cage, the potential field is nearly spherical; (2) Except for Li and Na, the systems are the most stable with minimum energies at the center of C60 cage. For Li and Na, the systems are the most stable with minimum energies at r≈0.16 nm and r≈0.13 nm, respectively. In view of the interactive region of chemical bonds, the interactions between X and the C60 cage do not belong to the classical chemical bonds; (