Journal ArticleDOI
Mechanism of the Color Reaction of Active Methylene Compounds with 1, 3, 5-Trinitrobenzene Derivatives. II. The Color Reaction of Acetone with 1, 3, 5-Trinitrobenzene
TLDR
In this article, the spectral behavior of two coloring matters (I and II) were investigated, which were formed in the color reaction of acetone with TNB, and an equilibrium reaction system related with I and II was proposed as shown in Chart 4.Abstract:
The spectral behaviors of two coloring matters (I and II) were investigated, which were formed in the color reaction of acetone with TNB. An equilibrium reaction system related with I and II was proposed as shown in Chart 4. We had found that the colorations of acetone with TNB in sodium hydroxide solutions were intensified by neutralizing the reaction mixtures with sodium dihydrogen phosphate. Now, the phenomenon was successfully explained by the scheme. On the other hand, another coloring matter (III) was isolated from the reaction mixture, which clarified the cause why the final absorption intensity at 480 mμ much increased when the conversion of I to II was carried out in the presence of excessive TNB. The structure of III, a tetracyclic compound, was determined as III' as shown in Chart 5. The correlations among the three coloring matters and their roles in the color reaction were discussed.read more
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The Nucleophilic Reaction of Electron-deficient Pyridone Derivatives. I. The Ring Transformation of 1-Substituted 3,5-Dinitro-2-pyridones with Sodio β-Keto Esters
TL;DR: In this article, a stepwise nucleophilic attack of the anion of β-keto esters at the electrophilic center of the 2 and 6positions or 2 and 3-positions of the 4-pyridones is proposed to interpret the variations of the reaction courses.
Journal ArticleDOI
Janovsky σ-Complexes
S. S. Gitis,A Ya Kaminskii +1 more
TL;DR: The methods of preparation, structure, and properties of the coloured products formed in the Janovsky reaction of aromatic polynitro-compounds with acetone and other ketones in an alkaline medium as well as the analogous complexes with other compounds containing mobile hydrogen atoms are examined in this paper.
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Inverse polarographic determination of creatinine with alkaline picrate and 3,5-dinitrosalicylic acid
K.G. Blass,R. J. Thibert +1 more
TL;DR: In this article, a selective and highly sensitive inverse polarographic method for the determination of creatinine has been developed, involving the measurement of disappearance of diffusion current for the picric acid wave (E 1 2 = −0.501 V ) when Creatinine is added.
Journal ArticleDOI
A ring transformation of 1-substituted 3,5-dinitro-2-pyidones
TL;DR: In this paper, reaction of 1-substituted 3,5-dinitro-2-pyridones with sodium salts of β-keto esters gave the ring transformation products, phenol derivatives and N -substitized nitroacetamides.
Journal ArticleDOI
Nitrierungsprodukte des Propyphenazons und deren Farbreaktionen mit Aceton und Kalilauge
TL;DR: In this paper, the main nitro compounds of Propyphenazone and their colour reactions with Acetone and Potassium Hydroxide were isolated, which turn to red or violet-blue on treatment with acetone and potassium hydroxide.