共查询到19条相似文献,搜索用时 93 毫秒
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以硫酸氢钾为催化剂,在无溶剂条件下催化2-萘酚和乙酰胺分别与苯甲醛、对硝基苯甲醛、水杨醛、茴香醛、香兰素等五种芳香醛的三组分反应,利用一锅法合成了系列1-乙酰胺烷基-2-萘酚.以1-乙酰胺基苯甲基-2-萘酚(AAN)的合成为模板反应考察了催化剂用量、反应温度、原料配比及反应时间等因素对产物收率的影响.结果表明,硫酸氢钾催化合成AAN反应的适宜条件为:n(2-萘酚)∶n(苯甲醛)∶n(乙酰胺)∶n(硫酸氢钾)=1∶1.2∶1.2∶0.05,90℃下反应40min,AAN的收率达92.1%.硫酸氢钾对其他四种反应也有较理想的催化作用,目标产物收率为69.1%~94.0%. 相似文献
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spectrohpotometric determination of Co(Ⅱ) was studied with 1-( 2 -pyridylazo)-2-naphthol
in the sodium dodecyl sulphate/n-heptane/water micr oemulsion medium.The apparent molar
absorptivity is 1.84×104 L.mol -1.cm-1
at 575 nm.Beer's law is obeyed in the range of 0~ 50 μg/25 mL for Co(Ⅱ). 相似文献
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合成了一系列吡啶N-氧化物-2-甲叉二硫代阱基甲酸酯一价负离子的Cu(Ⅱ)配合物,对其进行了元素分析、红外光谱、电子光谱和室温磁性表征,其中对4个配合物进行了变温磁化率测定和理论拟合,配合物具有二聚体结构单元,其分子内存在铁磁性交换作用,分子间存在反铁磁性交换作用。 相似文献
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Three sulfonated 1-(2-pyridylazo)-2-naphthols and six sulfonated 2-(2-pyridylazo)-1-naphthols were synthesized, and their application to the spectrophotometric determination of metals was studied. The acidity constants of the reagents and the stability constants of the nickel chelates are reported, and the relationship between their properties and the position of the sulfonic acid group is discussed. 1-(2-Pyridylazo)-2-naphthol-6-sulfonic acid (PAN-6S) and 1-(2-pyridylazo)-2-naphthol-7-sulfonic acid (PAN-7S) are sensitive and selective reagents for nickel. The determination of nickel in the presence of cobalt with PAN-6S is described. Extraction of the chelate as the ion-pair with tetraphenylarsonium ions into chloroform is suitable for the determination of 1–10 μg Ni at 570 nm; the molar absorptivity is 56 000 l mol-1 cm-1, and interferences are easily avoided. 相似文献
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Highly Efficient Michael Addition Reaction of Amines Catalyzed by Silica-Supported Aluminum Chloride
Aliphatic and aromatic amines undergo smooth nucleophilic addition to α,β-unsaturated compounds in the presence of a catalytic amount of silica-supported aluminum chloride at 60 °C and under solvent-free conditions to produce the corresponding β-amino compounds in excellent yields. This method is simple and convenient and works efficiently under mild conditions. This catalyst can used again without losing its activity three times. 相似文献
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A. S. Burlov A. S. Antsyshkina G. G. Sadkov V. V. Chesnokov Yu. V. Koshchienko D. A. Garnovskii I. S. Vasil’chenko A. I. Uraev G. S. Borodkin V. S. Sergienko A. D. Garnovskii 《Russian Journal of Coordination Chemistry》2010,36(12):906-912
Mono- and binuclear complexes of 2-(2-pyridyl)benzimidazole and its 1-alkyl-substituted derivatives with zinc dichloride were synthesized and structurally characterized. In terms of the competitive coordination problem, it was shown that pyridylbenzimidazole is an N,N-chelating ligand. The binuclear complex is formed through a dichloride bridge. 相似文献