苯乙酮经Trofimov反应一锅法制备吡咯衍生物的研究

研究了在碳酸氢钠-二甲亚砜催化体系中,酮经Trofimov反应一锅法制备吡咯衍生物。以苯乙酮为原料,生成3-苯基吡咯和1-乙烯基-3-苯基吡咯,反应温度及催化剂的用量对产品收率的影响。其最佳反应条件为:常压,100°C,前者收率为66.2%;后者收率为33.4%。催化剂用量均以NaHCO3/mg:DMSO/mL=420∶10为宜。产物IR及1H NMR均与文献值一致。     

碳纤维布基聚吡咯修饰电极的制备及性能表征

分别用恒电流、恒电位、循环伏安法、电沉积与恒电流相结合等电化学方法,制备了新型碳纤维布基聚吡咯修饰电极,用扫描电子显微镜( SEM)观察了其表面形貌,研究了吡咯在碳纤维布基上的聚合条件和膜的生长过程,研究了聚吡咯修饰电极对氟离子的电流响应特性.结果表明:用电沉积与恒电流相结合的方法制备的碳纤维布基聚吡咯膜具有致密性好、...     

基于吡咯-酰胺混合单元的阴离子受体的研究进展

综述了最近10年来对含有吡咯酰胺混合单元的阴离子受体的研究进展,重点评述了这些受体的阴离子配位性质。这些阴离子受体包括桥联二吡咯柄型二茂铁、基于联吡咯的索烃、附加有离子基团的吡咯酰胺、吡咯-2,5-二甲酰胺和吡咯-2,5-二乙酰胺。     

Electrosynthesis and characterizations of a multielectrochromic copolymer based on pyrrole and 3,4‐ethylenedioxythiophene

A copolymer based on pyrrole and 3,4‐ethylenedioxythiophene (EDOT) was electrochemically synthesized on an indium tin oxide ITO/glass electrode in acetonitrile containing lithium perchlorate (LiClO₄). The resultant copolymer is characterized via cyclic voltammetry, FTIR, SEM, XPS, and spectroelectrochemical analysis. The spectroelectrochemical analysis revealed the copolymer film has distinct electrochromic properties with respect to the homopolymers, and presented four colors (amaranth, brick red, dark grey, and light blue) under various applied potentials. For the copolymer in the neutral state, the calculated onset energy for the π–π* transition (E_g) is 1.69 eV, and the absorption peak (λ_max) is located at 508 nm. The maximum transmittance contrast (ΔT%) is 39.2% at 946 nm between the fully oxidized and intermediate(?0.4 V) states. Successive cyclic voltammograms and electrochromic switching experiment indicate the good stability of the copolymer because of the incorporation of EDOT units into the polypyrrole. It retains 81% of the original electroactivity and 71.8% of contrast after 2000 cycles. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

聚（N－取代吡咯）的合成及性能

制备了５种Ｎ－取代吡咯衍生物：Ｎ－丁基吡咯、Ｎ－辛基吡咯、Ｎ－十二烷基吡咯、Ｎ－十六烷基吡咯、Ｎ－十八烷基吡咯，用化学氧化法对其实施了聚合反应，最终得到黑色粉末状产物，其电导率均在１０~（－４）以下。通过ＦＴ－ＩＲ、元素分析等手段对聚合物进行了表征．     

Electrochemical synthesis and characterization of N-substituted polypyrrole derivatives on nickel

1-Dodecylpyrrole (PyCH₃) and 12-(pyrrol-1-yl)dodecane-1-thiol (PySH) films have been successfully electrochemically polymerised on a nickel electrode from acetonitrile solutions containing the monomer and the lithium perchlorate as supporting electrolyte. The electrochemical study of the polymer growth has been carried out by cyclic voltammetry (CV) detecting the nickel dissolution during electropolymerisation. Several surface spectroscopic and microscopic techniques have been used to characterize the surface in term of chemical composition and polymer topography. The presence of unbound and unoxidised thiol groups at the PPySH surface has been evidenced together with a very strong adhesion to the nickel substrate. Furthermore, N-substituted pyrrole derivatives exhibited some corrosion protection properties in neutral NaCl medium.     

Enzymatic Evidence for a Revised Congocidine Biosynthetic Pathway

Naturally produced pyrrolamides, such as congocidine, are nonribosomal peptides that bind to the minor groove of DNA. Efforts to delineate the biosynthetic machinery responsible for their assembly have mainly employed genetic methods, and the enzymes responsible for their biosynthesis remain largely uncharacterized. We report the biochemical characterization of four proteins involved in congocidine formation: the adenylation‐thiolation (A–T) di‐domain Cgc18(1–610), its MbtH‐like partner SAMR0548, the AMP‐binding enzyme Cgc3*, and the T domain Cgc19. We assayed the ATP‐dependent activation of various commercially available and chemically synthesized compounds with Cgc18(1–610) and Cgc3*. We report the revised substrate specificities of Cgc18(1–610) and Cgc3*, and loading of 4‐acetamidopyrrole‐2‐carboxylic acid onto Cgc19. Based on these biochemical studies, we suggest a revised congocidine biosynthetic pathway.     

Preparation and electrochemical capacitance of poly(pyrrole‐co‐aniline)

The copolymer of pyrrole and aniline, poly(pyrrole‐co‐aniline), has been prepared by chemical oxidation of corresponding monomer mixtures with ammonium peroxysulfate. Techniques of FTIR, SEM‐EDS, and BET surface area measurement were used to characterize the structure and morphology of the copolymer. The electrochemical properties of the copolymer were investigated by cyclic voltammetry, galvanostatic charge‐discharge, and electrochemical impedance spectroscopy. The results indicated that poly(pyrrole‐co‐aniline) was about 100–300 nm in diameter and showed better electrochemical capacitive performance than polypyrrole and polyaniline. The specific capacitance of the copolymer electrode was 827 F/g at a current of 8 mA/cm² in 1 mol/L Na₂SO₄ electrolyte. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

吡咯和吡啶燃烧的反应分子动力学模拟

采用基于反应力场的分子动力学方法(ReaxFF)研究了吡咯和吡啶的燃烧反应机理。重点考察了不同温度下吡咯和吡啶的燃烧过程中反应物、产物和主要反应中间体的分子数量变化规律,基于动力学轨迹可视化地观察获得了吡咯和吡啶的燃烧反应机理。结果表明,温度是影响芳香氮化物燃烧的重要因素。在燃烧过程中,随着温度的升高,CO2、H2O和氮氧化物(NOx)的生成速率逐渐加快,数量增多。随着反应的进行,CO2和H2O的生成量会逐渐趋于平衡,且达到平衡的时间随温度的升高而加快。吡咯和吡啶的分解速率都随着温度的升高不断增大。但在相同温度下,吡啶的分解时间比吡咯要长,分解速率比吡咯要低。两者燃烧产物、氧化过程中的含氮中间体相同,但热解开环方式、烃类自由基裂解路径明显不同。     

环【8】吡咯及其衍生物的一锅法合成、表征及光谱分析

一锅法合成了环【8】吡咯及其衍生物环【6]吡咯和环[7】吡咯,用正交实验获得了合成的最佳条件,使产率分别达到32％,20％,9％,对三个化合物进行了核磁共振氢谱、核磁共振碳谱、元素分析表征,研究了环[n】吡咯（n=6,7,8）的紫外可见吸收光谱和荧光发射光谱。