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Copolymerization of aniline and p-aminophenol in aqueous sulfuric acid solutions was electrochemically performed using cyclic voltammetry on platinum electrodes. The monomer concentration ratio can strongly affect the copolymerization rate and electrochemical property of the copolymer. The optimum conditions for the copolymerization are that the potential sweep covers the −0.20 to 0.95 V (vs. SCE) potential range, and that a solution contains 0.18 M aniline, 0.02 M p-aminophenol and 0.50 M H2SO4. A resulting copolymer synthesized under the optimum conditions has a good electrochemical activity in 0.50 M solutions of Na2SO4 with pH ≤ 10.0. IR and XPS spectra indicate that -OH groups and SO42− ions are contained in the resulting copolymer. The SEM images reveal that the microstructure of the copolymer depends on the monomer concentration ratio during the electrolysis. 相似文献
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以苯乙酮(对硝基苯乙酮)、硫脲和碘为原料合成了2-氨基-4-苯基噻唑和2-氨基-4-对硝基苯基噻唑。以α-卤代-2,4-二氯苯乙酮和硫脲为原料合成了2-氨基-4-(2,4-二氯苯基)噻唑。第二种合成方法反应简便,收率高 相似文献
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Jing Zhang 《Polymer》2007,48(5):1269-1275
A copolymer, poly(aniline-co-m-aminophenol), was synthesized chemically. The monomer concentration ratio strongly affects the copolymerization rate and the properties of the copolymer. A solution consisting 0.34 M aniline, 0.012 M m-aminophenol, 0.47 M ammonium peroxydisulfate and 2 M H2SO4 was found to be an optimum mixture for the chemical copolymerization. The visible spectra show that a high concentration ratio of m-aminophenol/aniline in the mixture inhibits the chain growth of the copolymer. The spectra of IR and 1H NMR demonstrate that m-aminophenol units are included in the copolymer chain, which play a key role in extending usable pH region of the copolymer. The result of cyclic voltammograms in a wide potential region of −0.20-0.80 V (vs. SCE) indicates that the copolymer prepared under the optimum condition still held 52.7% of the electrochemical activity when the copolymer electrode was transferred from a solution of pH 4.0 to a solution of pH 11.0, which is much better than that of polyaniline. The X-ray diffraction spectra and images of the copolymers reveal a fact that the changes in the crystal structure and morphology of the copolymers are as a function of the monomer ratio in the mixture. The conductivity of the copolymer prepared under the optimum condition is 2.3 S cm−1 and slightly depends on the pH value. 相似文献
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李付刚 《精细与专用化学品》2006,14(14):15-16
4-氯-2-硝基苯甲酸用甲基磺酰胺与五氯化磷氰化,铂炭催化剂存在下加氢还原得2-氨基-4-氯苯甲腈,接着与叠氮化钠成四唑环合成5-(2-氨基-4-氯苯基)四氮唑;以4-氯-2-硝基苯甲酸计,产品总收率70%,含量99%(HPLC法),产品经IR,1HNMR,MS测定,表明结构正确。 相似文献
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Hong Zhao Ying Jiang Yurong Ma Zhijiao Wu Qian Cao Yujian He Xiangjun Li Zhuobin Yuan 《Electrochimica acta》2010,55(7):2518-1027
Poly(2-amino-4-thiazoleacetic acid)/multiwalled carbon nanotubes modified glassy carbon electrodes obtained by electropolymerization of 2-amino-4-thiazoleacetic acid, were used for the voltammetric determination of copper ions. The voltammetric response of copper ions at poly(2-amino-4-thiazoleacetic acid)/multiwalled carbon nanotubes modified glassy carbon electrodes was evaluated by differential pulse stripping voltammetry. The peak currents were linearly dependent on the concentrations of the copper ions in the range from 7.0 × 10−7 M to 5.0 × 10−5 M, with a coefficiency of 0.9987. The detection limit is 5.0 × 10−10 M calculated for a signal-to-noise ratio of 3 (S/N = 3). And it could be used for the simultaneous determination of copper and cadmium ions. The proposed method was successfully applied to the determination of copper ions in natural water. The concentration of Cu2+ was calculated to be 2.0 × 10−5 M by standard addition method. The recovery rate was 94%. 相似文献
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The copolymerization of aniline and 2,4-diaminophenol (DAP) was first carried out in an acidic solution under a constant potential of 0.75 V. The copolymerization rate was found to increase with an increasing ratio of monomer DAP to aniline in the mixture. The opposite is true of the electrochemical copolymerization of aniline and o-aminophenol or m-aminophenol. The difference is due to the two kinds of electron-donating groups in DPA. Poly(aniline-co-2,4-diaminophenol) (PADAP), when synthesized under optimal conditions, has a good redox activity from pH < 1 to 11.0 in a wide potential region. Its conductivity is 0.26 S cm−1, which is very close to that of polyaniline synthesized under the same conditions in the absence of DAP. The pH dependence of PADAP conductivity was found to be better than that of polyaniline. PADAP that is synthesized under optimal conditions has unique magnetic resonance properties in NMR and ESR; molecules that are synthesized in the presence of other DAP to aniline concentration ratios have different properties. The monomer concentration ratio in the mixture and the applied potential strongly affect the properties of PADAP. 相似文献
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2-氯-3-氨基-4-甲基吡啶的合成 总被引:6,自引:0,他引:6
2 氯3 氨基4 甲基吡啶是合成抗艾滋病药物奈韦拉平的关键医药中间体。对其合成方法进行了全面的综述,并指出以4,4 二甲氧基2 丁酮和丙二腈为原料的合成方法工艺简单,生产成本低,具有较大的开发价值。 相似文献
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以β-氨基丙腈为原料,合成2-甲基-4-氨基-5-甲酰胺甲基嘧啶(MD),并进行了结构鉴定。总收率74%,产品纯度97%以上。 相似文献
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Polyaniline (PANi), poly(2-chloroaniline) (PClANi), and poly(aniline-co-2-chloroaniline) (co-PClANi) films were synthesized by electrochemical deposition on 304-stainless steel (SS) from an acetonitrile solution. The structural properties of these polymer films were characterized by spectroscopic (FTIR and UV–vis) and electrochemical (cyclic voltammetry) methods. Open circuit potential–time (Eocp–time) curves, potentiodynamic polarization, and electrochemical impedance (EIS) measurements showed that these films have significant protective performance against corrosion of SS in 0.5 M HCl solution. It was found that co-PClANi film has acted as a passivator as well as barrier for cathodic reduction reaction in a similar manner as PANi film. However, PClANi film has behaved only as barrier for corrosion protection of SS in 0.5 M HCl. 相似文献
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(2S,3R)-2羟基-3-氨基-4-苯基丁酸(AHPBA)是制备Bestatin、Phebestin和Probestin等氨肽酶N(Aminopeptide N)抑制剂的关键中间体。本文从氨基酸法(D-苯丙氨酸、L-天门冬氨酸、苹果酸二酯)、有机金属催化法(双功能铝配合物)、酶催化法(脂肪酶和全细胞酶)以及其它方法对此中间体的合成方法及路线进行综述和分析。经比较,有机催化法、酶法以及苯乙酮法因其具有经济有利、条件温和或路线简单特点,具有潜在的工业化应用前景。同时,未来人们对AHPBA的合成开发将集中在对已有工艺路线的改进与优化。 相似文献
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本文采用工业品原材料直接合成了导电聚苯胺,探讨了过硫酸铵体系中苯胺的聚合条件及掺杂反应时间等因素对聚苯胺比容量的影响,得出制备具有高比容量导电聚苯胺的最适宜条件为:过硫酸铵与苯胺的摩尔比为1.0,反应体系盐酸浓度为2.5mol/L,氧化剂滴加时间为30min,掺杂反应时间为3.5~17.5h。在此条件下可制得比容量高达143mAh/g的导电聚苯胺。在实验室小试基础上,我们还进行了聚苯胺的逐级放大研究,在苯胺投料量放大到7.5kg时,所得产物的比容量仍可达120mAh/g。 相似文献