排序方式: 共有74条查询结果,搜索用时 15 毫秒
1.
F. Pérez-Giménez G. M. Antón-Fos F. J. García-March M. T. Salabert-Salvador R. A. Cercós-del-Pozo J. Jaén-Oltra 《Chromatographia》1995,41(3-4):167-174
Summary The possible relation existing between RF values obtained by thin-layer chromatography for a group of anilines with connectivity indices proposed by Kier and Hall has been studied. Using multivariable regression the corresponding connectivity functions, selected for their respective correlation coefficients, standard deviations, Snedecor's F and Student's t were obtained. Regression analysis of the connectivity functions gives a correct prediction of the experimental elution sequence for this group of substances on silica gel stationary phases and various mobile phases of different polarity. The corresponding random and stability studies of the different prediction models selected were carried out, showing good stability and null randomness in all cases. 相似文献
2.
苯胺及其衍生物的毛细管电泳行为研究 总被引:3,自引:1,他引:3
黄甫 《理化检验(化学分册)》2003,39(12):696-699
采用紫外吸收检测,毛细管电泳分离,研究了九种苯胺及其衍生物在毛细管区带电泳(CZE)体系和胶束电动毛细管色谱(MECC)体系中的行为特征。讨论了缓冲溶液的浓度与pH、胶束浓度及混合胶束等在不同体系中对分离组分的影响,发现在CZE体系中,控制分离的主要因素是pKb值;在MECC体系中,控制分离的主要因素是溶质分子中碳原子数。建立了一种分离测定九种苯胺及其衍生物的高效毛细管电泳方法。 相似文献
3.
AbstractAnilines are rapidly, often within 60?minutes, converted into the corresponding phenols in up to 87% isolated yield. The presented experimentally simple protocol display broad compatibility with a variety of functional groups, and in particular, well suited for the preparation of methyl-substituted phenols. Such phenols are not easily available by other synthetic approaches. The formation of phenolic radical coupling products was not observed even for activated anilines using this open flask method. 相似文献
4.
A mild, convenient, and efficient process has been developed for the synthesis of 2,2,4‐trimethyl‐1,2‐dihydroquinolines by the reaction of anilines with acetone catalyzed by ytterbium(III) triflate [Yb(OTf)3] in ionic liquids. The catalyst and ionic liquids can be easily recovered and reused, making this method friendly and environmentally acceptable. 相似文献
5.
A simple, efficient, and rapid method for high-yielding regioselective mono bromination of phenols and anilines has been achieved by treatment with N-bromasaccharin in the presence of a catalytic amount of tungstophosphoric acid. 相似文献
6.
A simple synthetic procedure for direct formamidation and amination of aryl halides mediated by copper(II) salts was developed in open air, without an external ligand in formamide with potassium carbonate as a base. This approach is particularly efficient when electron active aryl halides are used as substrates. In these cases almost quantitative formamidation was observed. 相似文献
7.
Nucleophilic para-fluorination of substituted anilines to afford 4-fluorocyclohexadieneimine derivatives is achieved in the presence of hypervalent iodine and pyridinium polyhydrogen fluoride. 相似文献
8.
Addition of either ethanesulfonic acid or protonated triethylamine to the background electrolyte was found to markedly improve the separation of protonated anilines by capillary electrophoresis. These additives appear to form a thin coating on the capillary surface via a dynamic equilibrium. This results in a change in electroosmotic flow and reduces interactions of the sample cations with the silica surface. A mixture of 10 substituted anilines could be separated, including several positional isomers. Migration times of the sample cations were reproducible with a RSD less than 1.0%. 相似文献
9.
Xiao-Feng WuJohannes Schranck Helfried NeumannMatthias Beller 《Tetrahedron letters》2011,52(29):3702-3704
The first one-pot diazotization/aminocarbonylation reaction of anilines to benzamides has been developed. In the presence of commercially available palladium acetate/P(o-Tolyl)3 as the catalyst system without base at low temperature (50 °C) a variety of amides were synthesized in moderate to good yields. 相似文献
10.
Rahul R. NAGAWADE Devanand B. SHINDE 《中国化学快报》2006,17(9):1137-1140
The tetrahydroquinoline moiety is present in various natural products, and many tetra- hydroquinoline derivatives exhibit a broad range of biological activities1. Therefore, it has attracted continuous interest to develop methods for the synthesis of tetr… 相似文献