新型薁类-1-酰腙化合物的合成及抗菌活性研究

为了合成和研究具有薁类结构物质的新的生物活性, 以1-薁类羧酸甲酯为起始原料, 经过酰肼化、与芳香醛及酮类化合物的缩合, 合成了含有酰腙类结构的薁类衍生物, 其结构经1H NMR, IR和元素分析确证. 对所得化合物进行了抗菌活性测试, 初步表明它们具有一定的活性.     

Die Papierchromatographie einiger Azulene

Ohne Zusammenfassung     

Electrooxidation of Several Organic Compounds on Simply Prepared Metallic Nanoparticles: A Comparative Study

The electrooxidation of several fuel compounds was studied using metallic nanoparticles of Au, Pd, Pt, AuPd and AuPt synthesized by direct electrodeposition by applying a constant potential of ‐200 mV (vs. Ag/AgCl) to pencil graphite in an acidic medium. Scanning electron microscope (SEM) images and X‐ray diffraction (XRD) data show that monometallic (Au, Pd and Pt) and alloys of bimetallic nanoparticles of AuPd and AuPt have been formed. The catalytic performance of the prepared electrodes was investigated in a neutral medium (100 mM phosphate buffer, pH 7) by cyclic voltammetry. Amongst all fuels, the highest current densities were obtained by the electrooxidation of formic acid (ca. 9.8 mA cm^?2) and formaldehyde (ca. 9.7 mA cm^?2) on the AuPt catalyst.     

氮杂环化合物对苄醇电氧化的催化媒介作用研究进展

将芳香醇选择性地氧化为相应的羰基化合物(醛或酮)一直是化学研究人员面临的挑战之一。有机电合成技术中的间接电氧化法是进行芳香醇电氧化反应的常用方法,其中通过调控有机媒质结构是提高醇氧化选择性的一种有效途径。本文综述了几类含不同框架的有机媒质及其在醇的电化学氧化转化中的应用,介绍了这几类有机媒质的结构及其在间接电氧化反应中的作用机制,并进一步阐述了如何提高有机媒质的稳定性、溶解性和催化活性,实现醇的可控氧化转化。     

Theoretical Studies of Azulene and Its Derivatives

The results of ab initio calculation with STO-3G and 6-31G basis set on the azulene and its derivatives (included azulenequinones, diazoazulenequinones and polyether bridged azulenes) are presented in accordance with considerations of structures and bonding. Azulene is a nonalternant aromatic compound with ten π electrons and it has either C_s or symmetry dgpend on the different carbon and carbon bonding. The calculation results indicate that C_s symmetry is the ground state structure of azulene. TTie simple MO and CIS calculations describe the excited state of azulene.     

Azulene in Polymers and Their Properties

Azulene, a unique isomer of naphthalene, has received much interest from researchers in different fields due to its unusual chemical structure with a negatively charged 5‐membered ring fused with a positively charged 7‐membered ring. In particular, incorporation of azulene into polymers has led to many interesting properties. This minireview covers functionalization methods of azulene at its various positions of 5‐ and 7‐membered rings to form azulene derivatives including azulene monomers, and gives an overview of a wide range of azulene‐containing polymers including poly(1,3‐azulene), azulene‐based copolymers with connectivity at 1,3‐positions of the 5‐membered ring, or 4,7‐positions of the 7‐membered ring, as well as copolymers with azulene units as side chains. Their chemical and physical properties together with applications of azulene‐containing polymers have also been summarized.     

羟基新戊醛的间接电氧化研究

在离子交换膜电解槽内,将电解溴离子生成的溴单质作为氧化剂,使羟基新戊醛变成羟基新戊酸.研究了反应温度、pH、反应物浓度及阳极电位对电流效率和选择性的影响.结果表明,槽内式间接电氧化法制取羟基新戊酸的电流效率和选择性都较高,电流效率可达91.4%.选择性一般在90%以上.     

Electrooxidation of tigogenin acetate

Electrooxidation of tigogenin acetate afforded two products: 3β-acetoxy-16β-hydroxy-23,24-dinor-5α-cholanoic acid lactone (2) and 20-epitigogenin acetate (3). The structure of the latter compound was confirmed by an X-ray analysis. The tentative mechanism of reaction is proposed.     

Gold Surface Functionalization with S‐containing Organic Compounds and Gold Nanoparticles for Ethylene Glycol Electrooxidation

In this work a gold electrode modified with self‐assembled layers (SAMs) composed with organic S‐containing compound and gold nanoparticles was prepared. The electrode with SAMs endowed with gold nanoparticles gave the high catalytic effect for ethylene glycol (EG) electrooxidation in solution at pH 7. For this novel sensor a linear relationship between the current response of EG at the potential of peak maximum (j_p) and the concentration of this compound in solution (c_EG) was found over the range 0.1 µM to 0.7 M with the detection sensitivity j_p/c_EG equal to about 5 A cm^?2 mol^?1 dm³ (at v=0.1 V s^?1) and the detection limit of 0.046 µM.     

环戊二烯的电氧化反应

环戊二烯的氧化反应产物是合成一系列天然产物,如香料、前列腺素等的重要中间体。Shono 曾报道2-甲基-3-烯丙基环戊二烯经     

苄醇的选择性间接电氧化

以Ｃｅ￣（４＋）／Ｃｅ￣（３＋）为氧化还原体系，以硫酸为支持电解质，采用槽内法研究了苄醇的选择性间接电氧化。得出最佳电解条件：电流密度，０．１Ａ／２０ｃｍ￣２；亚铈与反应物当量比，１：６；硫酸浓度，３ｍｏｌ／Ｌ；通过电量，２Ｆ／ｍｏｌ（Ｆ为理论电量）。在最佳电解条件下，反应产物为苯甲醛，产率高达９６％，不发生深度氧化。阳极液循环１０次以上，对反应产率无影响。反应中Ｃｅ￣（４＋）只起电子传递作用，反应仅消耗电能，因此此法十分经济，且无污染。     

Electrooxidation of Phenylhydrazine on Carbon Electrodes

Electrochemical behavior of phenylhydrazine on glassy carbon and carbon fiber in a neutral aqueous solution is studied with differential voltammetry and potentiostatic oxidation. The fiber surface has a considerable catalytic effect, and the oxidation products depend on the fiber potential. The application of carbon fiber as an electrode material in electrochemical purification of waste water from phenylhydrazine is considered.     

甲醇阳极电氧化催化剂的研究

采用化学还原沉积法制备了Ｐｔ－ＷＯ３／Ｃ，Ｐｔ－Ｒｕ／Ｃ和Ｐｔ－ＷＯ３／Ｃ系列催化剂，通过循环伏安与电流－电位极化研究了甲醇在不同催化剂／Ｎａｆｉｏｎ奄极上的电催化氧化。结果表明，三种催化剂的催化活性顺序为：Ｐｔ－Ｒｕ－ＷＯ３／Ｃ〉Ｐｔ－Ｒｕ／Ｃ〉Ｐｔ－ＷＯ３／Ｃ。同时研究了甲醇浓度和催化剂的配比对阳极性能的影响。     

Metal-Enhanced S(2) Fluorescence from Azulene

In this paper, we report the first observation of metal-enhanced S(2) emission at room and low temperature (77K). The S(2) emission intensity of Azulene is enhanced by close proximity to Silver island films (SiFs). In this regard, a ≈ 2-fold higher S(2) fluorescence intensity of Azulene was observed from SiFs as compared to a glass control sample. This suggests that S(2) excited states can couple to surface plasmons and enhance S(2) fluorescence yields, a helpful observation in our understanding the interactions between plasmons and lumophores, and our continued efforts to develop a unified plasmon-lumophore/fluorophore theory.