Topic
Hydrazone
About: Hydrazone is a research topic. Over the lifetime, 4853 publications have been published within this topic receiving 65160 citations. The topic is also known as: hydrazone.
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TL;DR: In this article, azo coupling products at the methylene group in the heteroring were found to exist as hydrazone tautomers, which were derived from substituted anilines and 1H-1,2,4-triazol-5-amine.
Abstract: 5-Substituted furan-2(3H)-ones and 1-phenyl-1H-pyrrol-2(3H)-ones reacted with diazonium salts derived from substituted anilines and 1H-1,2,4-triazol-5-amine to give azo coupling products at the methylene group in the heteroring. The products were found to exist as hydrazone tautomers.
24 citations
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TL;DR: The in-situ prepared iron(III) complex of the hydrazone was investigated as a turn off fluorescent fluoride sensor in aqueous medium by displacement mechanism.
Abstract: A new aromatic hydrazone based on pyrene-1-aldehyde was synthesized and characterized by (1)H NMR and mass spectrometric analyses. The sensing properties of the hydrazone were studied by absorption and fluorescence studies in the aprotic solvent DMSO. It was capable of visual and fluorescent detection of fluoride over competitive ions (Cl(-), Br(-), H2PO4 (-), AcO(-)). Moreover, the in-situ prepared iron(III) complex of the hydrazone was investigated as a turn off fluorescent fluoride sensor in aqueous medium by displacement mechanism.
24 citations
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TL;DR: A sesnitive and selective spectrophotomeric method is proposed for the determination of clcium using diphenylglyoxal bis(2-hydroxybenzoyl hydrazone) and when masking agents are added common cations do not interfere.
Abstract: The synthesis, characteristics and analytical applications of diphenylglyoxal bis(2-hydroxybenzoyl hydrazone) are described. This compound reacts with calcium(II) at pH 12 to produce a yellow complex (λmax. = 432 nm, Iµ= 1.76 × 104 l mol–1 cm–1); another complex (1:1) can be detectd at pH 7.80. Dipyridylglyoxal bis(2-hydroxybenzoyl hydrozone). A sesnitive and selective spectrophotomeric method is proposed for the determination of clcium using diphenylglyoxal bis(2-hydroxybenzoyl hydrazone). Interferences have been investigated and when masking agents are added common cations do not interfere. The yellow calcium(II) complex has been used for the determination of clcium in waters and foods. The esults are compared with those obtained using glyoxal bis(2-hydroxyanil).
24 citations
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TL;DR: In this paper, the pyrolytic reaction of six tosyl arenecarboxaldoximes was studied over the temperature range ca 334 − 401 ¼ K to yield the following Arrhenius log A/s−1 and Ea /kJ mol−1, respectively: 10.92 and 98.25 for tosyls benzaldoxime and 10.83 and 100.4 for m-nitro-, 10.66 and 97.53 for p-chloro-, 11.60 and 101.5 for pmethyl- and
24 citations
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TL;DR: The enehydrazones 1a,g, 2a, c, d, f, g and 3a,d, f and g are prepared by addition of aliphatic hydrazones to carbonyl activated acetylenic compounds and their n.m. and u.v. spectra are compared as mentioned in this paper.
Abstract: Die Enhydrazone 1a–g, 2a, c, d, f, g und 3a–d, f, g werden durch Addition aliphatischer Hydrazone an carbonylaktivierte Acetylenverbindungen dargestellt und ihre NMR- und UV-Spektren verglichen. Einige Thermolyse-Produkte werden beschrieben.
Enehydrazines, 10. Some Aliphatic Enehydrazones
The enehydrazones 1a–g, 2a, c, d, f, g and 3a–d, f, g are prepared by addition of aliphatic hydrazones to carbonyl activated acetylenic compounds and their n.m.r. and u.v. spectra are compared. Some products of thermolysis are described.
24 citations