高效液相色谱手性固定相的研究 IV. (L,L)-二肽叔丁酰胺型手性固定相拆分α-氨基烃基膦酸衍生物对映异构体

本文制备了十种新型(L,L)-二肽叔丁酰胺型键合硅胶手性固定相, 并将其用于高效液相色谱拆分外消旋α-氨基烃基膦酸衍生物。实验结果表明拆分效果良好。本文就固定相及α-氨基烃基膦酸衍生物的结构对拆分效果的影响进行了,讨论并对拆分机制进地了初步探讨。     

刚性聚合物稀溶液流变性质的计算 Ⅱ.非定常流动

本文继续前一篇文章讨论描述刚性聚合物稀溶液流变性质的多棒刚杆分子模型,计算了应力发展的非定常剪切流动,结果表明,η~+将有所希望的“过冲”现象,且在无因次时间常数τ≥5后,流变性质达到定常均匀剪切流的结果,同时亦可方便地导得多球刚杆分子模型和无水学相互作用的刚性哑铃模型的结果。这些结果表明,此模型是较为完善的描述刚性聚合物稀溶液的分子模型。本文还对W_e≤0.7的情况作了深入的分析,比较了各阶近似解的计算结果。表明在W_e≤0.7时,用二阶近似解可代替高阶近似解计算,不会造成很大的误差,但可大大缩短计算时间。     

土槿皮三萜成分的研究

从土槿皮(Pseudolarix kaempferi, Gord.)中分到两个三萜成分, 经化学和光谱方法证明, 其一为具有羊毛甾烷母核的新三萜-3氧代-羊毛甾-7,23,25-三烯-23,26-环氧-27-羧酸, 命名为金钱松呋喃酸(1), 另一个为白桦脂酸(2), 此外, 还分到β-谷甾醇和β-谷甾醇-β-D-葡萄糖苷。     

有机硼酸盐的化学IV, 三烷基噻吩基硼酸锂与CO~2的反应

本文研究了三烷基噻吩基硼酸锂与CO~2的反应,发现三烷基噻吩基硼酸锂可与CO~2在高压下进行反应得5-烷基噻吩-2-羧酸;从而证实了三烷基噻吩基硼酸锂与亲电试剂反应时亲电试剂进攻的是噻吩基的5-位,而不是3-位,这一新反应可用于制备噻吩羧酸类化合物。此外,2-烷基噻吩-5-羧酸可以被Raney Ni还原而开环脱硫成一长链羧酸,因而提供了一个将烷基延长5个碳链的新方法。     

THE EFFECT OF MODIFICATION OF COORDINATING GROUPS ON THE CATALYTIC BEHAVIORS OF POLYMER CATALYSTS

Several polymer-supported palladium complex catalysts containing two different coordinatinggroups were prepared and the cooperative effect of the coordinating groups on the catalytic behaviorsof polymer catalysts was studied. It was found that poly(acrylic acid-co-acrylonitrile)-Pd complex(PAA-AN-Pd) is a more active and stable catalyst for hydrogenation than both poly(acrylic acid)-Pd and poly(acrylonitrile)-Pd complexes. A marked change of catalytic behaviors of poly(N-substituted maleamic acid-co-styrene)-Pd complexes was observed in comparison with poly(maleicacid-co-styrene)-Pd complex. Acetophenone was reduced to 1-phenyl ethanol by poly(N-phenylmaleamic acid-Co-styrene)-Pd complex (N-1-Pd), but ethylbenzene was obtained using poly(maleicacid-co-styrene)-Pd complex as a catalyst. The influence of solvents, additives and N/Pd gramatomic ratio on the catalytic behaviors of the polymer complexes was investigated.     

A STUDY OF POLYBUTADIENE SYNTHESIS WITH MoCl_n(OR)_(4-n)-(i-Bu)_2AlOPh AS A CATALYST

The catalytic effect of Mo Cl_n (OR)_(4_n)-(i-Bu)_2AlOPh on the polymerization of butadiene inhydrogenated gasoline is studied (R is alkyl, cycloheptyl, phenyl of C_(4_16)). In this system, the solu-bility and the catalytic activity of the catalyst do not depend on whether the number of carbon atomsin R group is odd or even. The R group with the primary and secondary carbon atom has a fairlygreat influence on the catalytic activity. When R is an alkyl, the catalytic activity increases and therange of Al/Mo values that keeps higher conversion of butadiene is broadened as the size of the Rgroup increases. The content of 1,2-units in the polymer hardly varies with the size of the R group.     

Synthesis and Crystal Structure of 3,3,6,6-Tetramethyl-N-hydroxy-9-ethyl-1,8-dioxo-1,2,3,4,5,6,7,8,9,10-decahydroacridine

1 INTRODUCTION 1,4-Dihydropyridines (1,4-DHPs) are well-knowncompounds because of their pharmacological pro-perty as calcium channel modulators[1, . The che- 2]mical modifications, such as the introduction of dif-ferent substituents[3, or heteroatoms[5], of the DHP 4]ring have allowed the expansion of researches onthe structure-activity relationship to gain new in-sights into the molecular interactions at the receptorlevel. In fact, it is well established th…     

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 …     

新颖的二维超分子化合物[CoⅢ(aea)(2,2''''-bipy)]Cl·H2O的水热合成及结构表征

0IntroductionInrecentyearsgreatattentionhasbeenpaidtosupramolecularchemistryandawidevarietyofnet鄄workshavealreadybeenconstructedbasedupontheprincipleofcrystalengineering[1~3].Usually,variousmultifunctionalorganicligands,bothrigidandflexiblemulticarboxyli…     

载钛催化剂的气固相法制备及其在环氧化氯丙烯反应中的催化活性

利用TiCl4气固相法,以含硅物质为原料,制备了7种钛硅氧化物类催化剂,并考察了其在H2O2环氧化氯丙烯反应中的催化活性。实验结果表明：只有以HZSM-5为载体制备的催化剂具有催化环氧化活性。酸处理HZSM-5对催化剂活性的影响并不大,分子筛的硅铝比和气固相反应时间是影响其催化活性的重要因素,且催化活性随着硅铝比的降低而降低。气固相反应时间16h时,催化剂的活性最高。