大位阻取代环戊二烯基钛,锆化合物的合成及光谱性质

通过１－环己烯基锂与６，６－二烷基富烯发生环外双键的加成反应形成大位阻取代茂锂盐；后者再与ＭＣｌ４（Ｍ＝Ｔｉ，Ｚｒ）反应，合成了７个含或不含手性碳的大位阻取代茂金属有机化合物，并研究了它们的１ＨＮＭＲ、ＥＩＭＳ和ＩＲ．     

6,6—二烷基富烯与苄基钠的反应研究：取代茂钛,锆化合物…

苄基钠与６，６－二烷基富烯及６，６－ｎ亚甲基富烯（ｎ＝４，５，６）皆发生富烯环外双键的加成反应。产生的取代环戊二烯基负离子与ＴｉＣｌ４、ＺｒＣｌｒ及（ＣｐＴｉＣｌ２）２Ｏ络合，合成出２２种新的含或不含手性碳取代茂铁、锆化合物。讨论了反应机理及＾１Ｈ ＮＭＲ谱。     

经分子内Mannich反应合成3,6—二取代—5,6—二氢—s—三唑并（3,4—b）—1, …

３－取代基－４－氨基－５－巯基－１，２，４－三唑在微量酸催化下与取代芳香醛经分子内Ｍａｎｎｉｃｈ反应合成了２９个新的３，６－二取代－５，６－二氢－ｓ－三唑并（３，４－ｂ）－１，３，４－噻二唑啉类化合物，其结构经元素分析，ＩＲ和＾１ＨＮＭＲ进行确证，并讨论了反应的立体选择性。     

6，6－二烷基富烯与苄基钠的反应研究──取代茂钛、锆化合物的合成

苄基钠与６，６－二烷基富烯及６，６－ｎ亚甲基富烯（ｎ＝４，５，６）皆发生富烯环外双键的加成反应。产生的取代环戊二烯基负离子与ＴｉＣｌ_４、ＺｒＣｌ_４及（ＣｐＴｉＣｌ_２）_２Ｏ络合，合成出２２种新的含或不含手性碳取代茂钛、锆化合物。讨论了反应机理及~１ＨＮＭＲ谱。     

Synthesis of 3,6-Disubstituted 5,6-Dihydro-s-triazolo [3,4-b]-1,3,4-thiadiazolidines through the Intramolecular Mannich Reaction

３－取代基－４－氨基－５－巯基－１，２，４－三唑在微量酸催化下与取代芳香醛经分子内Ｍａｎｎｉｃｈ反应合成了２９个新的３，６－二取代－５，６－二氢－ｓ－三唑并［３，４－ｂ］－１，３，４－噻二唑啉类化合物，其结构经元素分析、ＩＲ和１ＨＮＭＲ进行确证，并讨论了反应的立体选择性。     

有机环四硅氧烷液晶的合成及其相变行为

两种环四硅氧烷分别和６种液晶基元化合物（Ｍ１－６）反应，合成了６种仅含１个介晶侧基的环四硅氧烷（１－６）。它们的化学结构已由＾１ＨＮＭＲ、ＩＲ和元素分析证实，借助ＤＳＣ和偏光显微镜观察研究了１２个化合物的相变行为。     

2－羟基2＇烷氧基－1，1＇－联萘化合物的~1HMNR研究

研究了２－羟基－２＇－异丙氧基－１。１－联萘（３）等联萘化合物的~１ＨＮＭＲ谱或ＣＯＳＹ谱。此类化合物因２及２＇位取代基不同，两个萘环上同位质子不再等价，萘环质子峰增至１２组。化合物３~１ＨＮＭＲ谱峰的归属表明，萘环环电流各向异性对另一萘环质子的屏蔽作用与作者早期研究结果［１］一致。２（或２＇）位取代基上的质子的化学位移也与另一萘环平面相对位置有关。     

2—羟基2‘烷氧基—1,1’—联萘化合物的^1HMNR研究

研究了２－羟基－２＇－异丙氧基－１，１－联萘（３）等联萘化合物＾１Ｈ ＮＭＲ谱或ＣＯＳＹ谱，此类化合物因２及２＇位取代基不同，两个萘环上同位质子不再等价，萘环质子峰增至１２组。化合物３＾１ＨＮＭＲ谱峰的归属表明，萘环环电流各向异性对另一萘环质子的屏蔽作用与作者早期研究结果一致。２（或２＇）位取代基上的质子的化学位移也与另一萘环平面相对位置有关。     

3-吡唑基-6-取代均三唑并[3,4-b]-1,3,4-噻二唑的合成及生物活性

以１－甲基－３－乙基（－４－氯）－５－吡唑甲酰肼作原料，经两步得到４－氨基－３－（１－甲基－３－乙基（－４－氯）－５－吡唑基）－１，２，４－三唑－５－硫酮（３），３再与取代羧酸反应，得到一系列３－（１－甲基－３－乙基（－４－氯）－５－吡唑基）－６－取代均三唑并［３，４－ｂ］－１，３，４－噻二唑（４、５、６）．元素分析、１ＨＮＭＲ、ＩＲ和ＭＳ确定了它们的结构．初步生测结果表明：３具有植物生长调节活性，４ｂ、４ｄ、６具有杀菌活性．     

含吡啶环联苯型[33]环系和含中心功能基[22]环系冠醚化合物的合成

以２，６－二溴甲基吡啶、４－甲基－２，６－二溴甲基苯甲醚为前体分别与２，２′－二羟基联苯反应合成新型的含吡啶环联苯型［３３］环系和含中心功能基［２２］环系冠醚化合物。其结构经元素分析、ＩＲ、１ＨＮＭＲ、ＭＳ等确证     

多环芳二酐型聚酯亚胺膜的透气性能

多环芳二酐型聚酯亚胺膜的透气性能李悦生，丁孟贤，徐纪平（浙江大学高分子科学与工程研究所，杭州，３１００２７）（中国科学院长春应用化学研究所）关键词聚醚酰亚胺，聚酯酰亚胺，膜，透气性通常的聚酰亚胺加工性能较差，在芳环二酐的苯环间引入醚键等柔性基团后，其...     

微量元素与疾病诊断治疗的研究现状及展望

对国内外微量元素与疾病的关系及其诊断治疗的研究现状及研究动向进行了综述，包括：微量元素与地方病、癌肿、心血管病、糖尿病、眼病、神经系统病等。参考文献72篇。     

Determination and study on residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil

A QuEChERS (quick, easy, cheap, effective, rugged, and safe) method for the determination of benazolin-ethyl and quizalofop-p-ethyl in rape and soil by high-performance liquid chromatography-tandem mass spectrometry has been developed in this study. The residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil were determined with the developed method. The half-lives of benazolin-ethyl in rape straw and soil were 3.7–5.1 days and 14.3–26.3 days, respectively. The half-lives of quizalofop-p-ethyl in rape straw and soil were 5.0-6.1 days and 0.3–9.7 days, respectively. The residue of benazolin-ethyl and quizalofop-p-ethyl in rapeseed and soil were below the detection limit (i.e., 0.5?mg?kg^?1, the maximum residue level of European Union for quizalofop-p-ethyl).     

Ti-V基储氢合金及其氢化物的物相结构与组分优化设计

Ti-V基储氢合金在室温、常压下即可表现出良好的储氢特性,且质量储氢容量明显高于传统AB₅型储氢合金,从而在氢气的精制和回收、运输和储存及热泵等方面有较早的应用。 此外,在混合气体分离、核反应堆中处理氢的同位素、镍氢电池及燃料电池负极材料等方面也得到了广泛的研究与关注。 基于目前Ti-V基储氢合金的研究现状,概述了该类合金的优势、限制性因素(包括成因)及改性手段。 此外,为了进一步理解Ti-V基合金储氢机理、构建合金组分与储氢特性之间的对应关系,本工作重点围绕Ti-V基储氢合金及其氢化物的结构、组分优化设计展开综述,并对其未来研究方向做出展望。     

钒与糖代谢及糖尿病

微量元素钒作为生物体内必需元素，经证实有很重要的生理学功能，与机体糖代谢有十分密切的关系，且能降低糖尿病动物模型的高血糖，极有可能被开发为治疗糖尿病的药物。     

Synthesis of Tyrosol and Hydroxytyrosol Glycofuranosides and Their Biochemical and Biological Activities in Cell-Free and Cellular Assays

Tyrosol (T) and hydroxytyrosol (HOT) and their glycosides are promising candidates for applications in functional food products or in complementary therapy. A series of phenylethanoid glycofuranosides (PEGFs) were synthesized to compare some of their biochemical and biological activities with T and HOT. The optimization of glycosylation promoted by environmentally benign basic zinc carbonate was performed to prepare HOT α-L-arabino-, β-D-apio-, and β-D-ribofuranosides. T and HOT β-D-fructofuranosides, prepared by enzymatic transfructosylation of T and HOT, were also included in the comparative study. The antioxidant capacity and DNA-protective potential of T, HOT, and PEGFs on plasmid DNA were determined using cell-free assays. The DNA-damaging potential of the studied compounds for human hepatoma HepG2 cells and their DNA-protective potential on HepG2 cells against hydrogen peroxide were evaluated using the comet assay. Experiments revealed a spectrum of different activities of the studied compounds. HOT and HOT β-D-fructofuranoside appear to be the best-performing scavengers and protectants of plasmid DNA and HepG2 cells. T and T β-D-fructofuranoside display almost zero or low scavenging/antioxidant activity and protective effects on plasmid DNA or HepG2 cells. The results imply that especially HOT β-D-fructofuranoside and β-D-apiofuranoside could be considered as prospective molecules for the subsequent design of supplements with potential in food and health protection.     

Conformations and steric and stacking interactions of trisubstituted ureas and thioureas with alkyl and phenyl groups

The monomeric ν(N—H) vibrations of various trisubstituted ureas of the R₂UPh type and -thioureas of the R₂TUPh type have been studied. The trans—out isomerism in the former and the trans—out—cis isomerism in the latter are discussed from the point of view of steric effect. The monomeric ν(N—H) vibrations of RPhUPh and RPhTUPh are also examined. The single band appearing in the spectrum of both ureas is characteristic of the cis form; this suggests the existence of phenyl—phenyl interaction (the stacking interaction proposed by Galabov et al. [10]). Behavior of ν(N—H) vibrations at several concentrations is shown to be clearly different in the three forms (trans, out and cis). The presence of the cis form is confirmed by solvent effect experiments.     

Ferrocene and ferrocenium modified clays and their styrene and EVA composites

In this work, ferrocene- and ferrocenium-containing salts were employed to modify montmorillonite. X-ray measurements show an increase in the interlayer spacing upon clay modification, which means that the larger and more organophilic cations were inserted into the gallery space of montmorillonite. Attempts to prepare nanocomposites of polystyrene and ethylene vinyl acetate copolymers lead to immiscible systems; the morphology of these systems was elucidated with TEM, XRD and cone calorimetry. The thermal stability of the composites is greater than that of the virgin polymer.     

Synthesis and Optical and Redox Properties of Symmetric and Asymmetric BODIPYs

Herein, we present the synthetic route and the photophysical, electrochemical as well as laser properties of novel red‐emitting boron‐dipyrromethenes (BODIPYs) bearing arylethyne moieties. Such functionality is added along the main axis of the chromophore leading to single‐ and double‐substituted derivatives. The relationship between the dye structure and the lasing properties is studied in detail with the help of the photophysical and electrochemical properties as well as quantum mechanical simulations. The asymmetric substitution of the parent dye induces inhomogeneities in the charge distribution, which leads to an overall loss of the fluorescence capacity, mainly in polar media. Such non‐radiative deactivation processes can be softened by decreasing the electron‐donor ability of the substituent or even avoided by symmetrical substitution. Thus, grafting of the arylethyne moieties at the longitudinal axis of the indacene core results in an effective strategy to develop red‐edge BODIPYs with highly efficient and photostable laser emission.