共查询到17条相似文献,搜索用时 140 毫秒
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合成了新试剂1-(2-噻唑)-3-(8-(5-对磺酸基苯基偶氮)喹啉-三氮烯(TCPQT),并研究了其与Cu2+的显色反应。结果表明:在pH 7.5的磷酸盐缓冲溶液中,TCPQT与Cu2+形成摩尔比为1:1的紫红色络合物,该络合物在606.5nm处有一最大吸收峰,其表观摩尔吸光系数为3.36×105L.mol-1.cm-1,Cu2+的质量浓度在0~0.4μg/mL范围内符合比尔定律,相关系数r=0.9993。方法已用于测定食品中的微量铜。 相似文献
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1-(8-喹啉)-3-(2-苯并噻唑)三氮烯的合成及其与铜(Ⅱ)的显色反应 总被引:3,自引:0,他引:3
合成了新的三氮烯试剂:1 (8 喹啉) 3 (2 苯并噻唑) 三氮烯(QBTT),并研究了该试剂与Cu2 的显色反应,建立了测定铜的灵敏度较高、选择性较好的光度分析新方法。在选定的实验条件下,Cu2 与QBTT在室温下迅速生成络合比为1∶1的紫色络合物,其最大吸收波长为590nm,表观摩尔吸光系数ε=7.48×104L·mol-1·cm-1,Cu2 的质量浓度在0~1.0μg/mL范围内符合比尔定律,该方法可用于测定食品中的微量铜。 相似文献
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O. V. Shablykina O. V. Khilya V. V. Ishchenko V. P. Khilya 《Chemistry of Natural Compounds》2005,41(5):529-532
3-(2-Quinolyl)- and 3-(5-carbethoxyfuryl-2)coumarins were prepared by reaction of substituted salicylaldehydes and hetarylacetonitriles.
Alkylation and acylation of 3-hetaryl-7-hydroxycoumarins were studied.
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Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 432–434, September–October, 2005. 相似文献
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By condensation of 2-methyl resorcinol with 2-quinolyl acetonitrile, we have synthesized α-(2-quinolyl)-2,4-dihydroxy-3-methylacetophenone, which when reacted with carboxylic acid anhydrides followed by hydrolysis yields 2-R-7-hydroxy-8-methyl-3-(2-quinolyl)chromones.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 407–415, March, 2005. 相似文献
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The hydroxylation of 1-alkyl-3-(2-quinolyl)quinolinium halides by an alkaline solution of K3[Fe(CN)6] in aqueous 1,4-dioxane leads to a mixture of 1-alkyl-3-(2-quinolyl)-1,2-dihydro-2-quinolones and 1-alkyl-3-(2-quinolyl)-1,4-dihydro-4-quinolones with predominance of the former. The use of the system of K3[Fe(CN)6]/Mg(OH)2 in aqueous 1,4-dioxane leads to the regiospecific formation of 1-alkyl-3-(2-quinolyl)-1,4-dihydro-4-quinolones. 相似文献
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The compound (Z)-ethyl 5-(phenylamino)-3-(phenylimino)-3H-1,2-dithiole-4-carboxylate 3 has been synthesized by the reaction of ethylacetoacetate 1 and phenylisothiocyanate 2. Its structure has been established by 1H NMR, 13C NMR, infrared, mass spectra, and x-ray crystallography. 相似文献
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S. Tasqeeruddin P. K. Dubey 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):128-134
Abstract 3-(2-Bromoacetyl)coumarins (I), when treated with 2-mercatobenzimidazole (II) in acetone containing K2CO3 (mild base) and tetrabutylammonium bromide (TBAB) as a phase transfer catalyst, at room temperature yielded the title compound 3-[2-(1H-benzimidazole-2-yl-sufanyl)-acetyl]-chromen-2-one (III) in a one-pot synthesis. Alternatively, III could also be prepared by treating dithiocarbonic acid O-ethyl ester, S-[2-oxo-2-(2-oxo-2H-chromen3-yl)-ethyl] ester (V), with o-phenylenediamine (VI). The methylation of the title compound III was performed with dimethyl sulfate (DMS), in acetonitrile containing TBAB and K2CO3 at room temperature, resulting in 3-[2-(N-methyl-benzimidazol-2-yl-sulfanyl)]-acetyl-chromen-2-ones (VII). Alternatively, methylation of III could also be performed with DMS in acetonitrile containing K2CO3 as base and clay as surface catalyst. All the compounds were synthesized in good yields and their structures were confirmed by spectral and analytical data. [Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental resource: 1H NMR of IIIB, VB and VIIB] 相似文献
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The title compound (ethyl5-(4-(2-phenylacetamido)phenyl)-1H-pyrazole-3-carboxy- late, C20H19N3O3) was synthesized by the reaction of Claisen condensation, cyclization, reduction and acylation. The structure was characterized by X-ray diffraction, MS, NMR and IR. It belongs to the monoclinic system, space group C2/c with a = 22.723(9), b = 9.324(4), c = 18.890(8) , β = 114.259(6)°, V = 3649(3) 3, Dc = 1.272 Mg·m-3, Z = 8, Mr = 349.38, μ = 0.087 mm-1, F(000) = 1472, the final R = 0.0615 and wR = 0.1643. The biological test shows that the title compound has a moderate acrosin inhibition activity. 相似文献