Reactions of some 2-(6-azauracil-5-yl)phenylhydrazones

1979 ◽  
Vol 44 (8) ◽  
pp. 2438-2442 ◽  
Author(s):  
Jan Slouka
Keyword(s):  
Carboxylic Acid ◽  
Acid Medium ◽  
Alkaline Medium ◽  
Acidic Medium ◽  
Diazonium Salt ◽  
Azo Coupling

Azo coupling of the diazotized 6-(2-aminophenyl)-2,3,4,5-tetrahydro-1,2,4-triazine-3,5-dione with ethyl cyanoacetylcarbamate and diethyl malonyl-bis-carbamate has been used for preparation of the hydrazones I and II. The latter substances have been boiled in strongly acidic medium to give 2,3,4,6-tetrahydro-1,2,4-triazino[5,6-c]cinnoline-3-one (III) which has also been obtained by reduction of the mentioned diazonium salt with alkali sulphite and sebsequent cyclization of the formed hydrazine sulphonate by boiling in acid medium. In alkaline medium the hydrazones I and II have been cyclized to the nitrile IV and to 2-[2-(3,5-dioxo-2,3,4,5-tetrahydro-1,2,4-triazin-6-yl)-phenyl]-3,5-dioxo-2,3,4,5-tetrahydro-1,2,4-triazine-6-carboxylic acid (V), respectively.

scholarly journals Hybrid Electromagnetic Nanomaterials Based on Polydiphenylamine-2-carboxylic Acid

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1568
Author(s):  
Sveta Zhiraslanovna Ozkan ◽  
Aleksandr Ivanovich Kostev ◽  
Galina Petrovna Karpacheva ◽  
Petr Aleksandrovich Chernavskii ◽  
Andrey Aleksandrovich Vasilev ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Alkaline Medium ◽  
Acidic Medium ◽  
Oxidative Polymerization ◽  
Reaction Medium ◽  
Medium Ph ◽  
Extraction And Purification ◽  
Structure Morphology ◽  
Polymer Metal ◽  
Walled Carbon Nanotubes

Hybrid ternary nanomaterials based on conjugated polymer polydiphenylamine-2-carboxylic acid (PDPAC) (poly-N-phenylanthranilic acid), Fe3O4 nanoparticles and single-walled carbon nanotubes (SWCNT) were prepared for the first time. Polymer–metal–carbon Fe3O4/SWCNT/PDPAC nanocomposites were synthesized via in situ oxidative polymerization of diphenylamine-2-carboxylic acid (DPAC) by two different ways: in an acidic medium and in the interfacial process in an alkaline medium. In an alkaline medium (pH 11.4), the entire process of Fe3O4/SWCNT/PDPAC-1 synthesis was carried out in one reaction vessel without intermediate stages of product extraction and purification. In an acidic medium (pH 0.3), to prepare the Fe3O4/SWCNT/PDPAC-2 nanocomposites, prefabricated magnetite nanoparticles were deposited on the surface of obtained SWCNT/PDPAC-2. The phase composition of the nanocomposites does not depend on the synthesis reaction medium pH. The influence of the reaction medium pH on the structure, morphology, thermal, magnetic, and electrical properties of the obtained ternary nanocomposites was studied.

Oxidation mechanism of carcinogenic bis-azo dyestuff Trypan Blue

1982 ◽  
Vol 47 (10) ◽  
pp. 2746-2748 ◽  
Author(s):  
Miroslav Matrka ◽  
Jana Pípalová
Keyword(s):  
Acid Medium ◽  
Quantitative Evaluation ◽  
Oxidation Product ◽  
Trypan Blue ◽  
Oxidation Mechanism ◽  
Azo Coupling ◽  
Arenediazonium Salt

Oxidation of Trypan Blue with cerium(IV) ion in acid medium gives arenediazonium cation similar to the oxidation product of N,N-dimethyl-4-aminoazobenzene. Quantitative evaluation of the arenediazonium salt formed has been carried out spectrophotometrically after previous C-azo coupling with 2-naphthol.

scholarly journals A Study of Mild Steel Corrosion UsingAdhatoda Vasica(AV) Extract as Inhibitor in Different Acid Medium

2010 ◽  
Vol 7 (4) ◽  
pp. 1284-1289 ◽  
Author(s):  
P. Matheswaran ◽  
A. K. Ramasamy
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Acid Medium ◽  
Acidic Medium ◽  
Active Sites ◽  
Mixed Type ◽  
Steel Corrosion ◽  
Adhatoda Vasica ◽  
Mild Steel Corrosion ◽  
Inhibitive Action

Corrosion behavior of mild steel in acidic medium usingAdhatoda Vasica(AV) extract was investigated. The inhibitive effective ofAdhatoda Vasicaon the corrosion of mild steel in different acidic medium has been studied by weight loss and polarization methods. The Ecorrvalues are shifted slightly towards negative side in presence of inhibitors which indicate the inhibitors inhibit the corrosion of mild steel in acids solution by controlling both anodic and cathodic reactions due to the blocking of active sites on the metal surface. It is evident that inhibitors bring about considerable polarization of the cathode as well as anode. It was, therefore, inferred that the inhibitive action is of mixed type.

Determination of Unconjugated and Total N-Acetyl-p-aminophenol (NAPA) in Urine and Serum

1967 ◽  
Vol 13 (3) ◽  
pp. 215-219 ◽  
Author(s):  
Karel P M Heirwegh ◽  
Johan Fevery
Keyword(s):  
Liver Disease ◽  
Acid Hydrolysis ◽  
Azo Dye ◽  
Acidic Medium ◽  
Diazonium Salt ◽  
Accurate Method ◽  
Total N ◽  
Hydrolysis Of ◽  
Urine And Serum

Abstract A sensitive and accurate method is described for the determination of N-acetyl-p-aminophenol (NAPA) and its metabolites in urine and serum. In strongly acidic medium, p-aminophenol (PAP) resulting from differential extraction and acid hydrolysis of total NAPA and unconjugated NAPA, is diazotized and the diazonium salt coupled with N-(1-naphthyl)ethylenediamine (NED) in the presence of ethanol. The blue azo dye formed is determined spectrophotometrically. Application to liver disease is briefly reported.

Iron and nitrogen co-functionalized porous 3D graphene frameworks as an efficient oxygen reduction catalyst

RSC Advances ◽  
2016 ◽  
Vol 6 (78) ◽  
pp. 74886-74894 ◽  
Author(s):  
Lili Cui ◽  
Mei Wu ◽  
Jinbao Xiang
Keyword(s):  
Oxygen Reduction ◽  
Alkaline Medium ◽  
Electrocatalytic Activity ◽  
Acidic Medium ◽  
3D Graphene ◽  
Enhanced Activity ◽  
Oxygen Reduction Catalyst

Fe/N-GAs exhibit comparable electrocatalytic activity to commercial Pt/C in alkaline medium together with enhanced activity compared to N-GAs in acidic medium.

Integrated System to Biological Solubilization and Precipitation of Heavy Metals

2007 ◽  
Vol 20-21 ◽  
pp. 279-282
Author(s):  
G. Cabrera ◽  
José Manuel Gómez ◽  
Domingo Cantero
Keyword(s):  
Heavy Metals ◽  
Acid Medium ◽  
Polyurethane Foam ◽  
Acidic Medium ◽  
Integrated System ◽  
Continuous Processes ◽  
Column Reactor ◽  
Sulphate Reducing Bacteria ◽  
Biological Solubilization ◽  
Reducing Bacteria

The work consists on the study of a sulphur–oxidizing bacteria (At. thiooxidans) immobilisation over polyurethane foam and the integration of two continuous processes: the solubilization of heavy metals by acidic medium generated by sulphur-oxidizing bacteria and the subsequent precipitation of metals as sulphides with H2S biologically generated by sulphate-reducing bacteria (Desulfovibrio sp). At. thiooxidans was satisfactory immobilised over polyurethane foam and added to a column reactor. Acidic medium generated was added to a column with 50 g of an artificial contaminated sand (85 mg Cr(III), 20 mg Ni(II), 200 mg Zn(II)). The effluent of this step was collected in a reservoir tank, in which H2S from sulphate-reducing reactor was included to carry out the precipitation of metals. After 2.4 l of acid medium was passed through the column, it was observed that 14.6% of Cr(III), 26.7% of Ni(II) and 90.5% of Zn(II) were solubilized. The leachate was treated with 2.2 l of reducing medium, and 2.2% Cr(III),54% Ni(II) and 28% Zn(II) were precipitated.

Liquid-liquid extraction of plutonium and americium by cekanoic acid from alkaline medium

2001 ◽  
Vol 89 (2) ◽  
Author(s):  
K. V. Chetty ◽  
V. Sagar ◽  
R. Swarup
Keyword(s):  
Molecular Weight ◽  
Carboxylic Acid ◽  
High Molecular Weight ◽  
Alkaline Medium ◽  
Distribution Ratio ◽  
Liquid Extraction ◽  
Liquid Liquid Extraction ◽  
Carbonate Medium ◽  
D Values

Liquid-liquid extraction studies of plutonium and americium from aqueous carbonate medium using a high molecular weight carboxylic acid namely cekanoic acid in different diluents has been carried out. The distribution ratio (D) values for Pu(IV) and Am(III) under various parameters such as concentration of extractant, Na

scholarly journals Synthesis by Reversed Phase Transfer Catalysis and Characterization of Naphthol AS-D Pigment

2013 ◽  
Vol 2013 ◽  
pp. 1-4
Author(s):  
Eleonora Cornelia Crasmareanu ◽  
Vasile Simulescu ◽  
Gheorghe Ilia
Keyword(s):  
Carboxylic Acid ◽  
Organic Phase ◽  
Reaction Rate ◽  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Coupling Reaction ◽  
Reversed Phase ◽  
Azo Coupling ◽  
Unconventional Method

Reversed phase transfer catalysis (RPTC) was applied to synthesize the Naphthol AS-D pigment. This method consists in the transfer of the aryldiazonium cation 4-nitrobenzenediazonium from aqueous medium into the organic phase (nitrobenzene) in the form of a lipophilic ions pair by the catalyst used (perfluorooctyl potassium sulfonates). In the organic phase the azo-coupling reaction between 4-nitrobenzenediazonium chloride and 3-hydroxy-2-carboxylic acid 2-methyl-anilide (Naphthol AS-D) takes place as coupling component. Using this unconventional method of synthesis, an increase of the reaction rate, combined with a higher purity of the product, was obtained.

scholarly journals Synthetic Surface-active Substances Abstraction from Water Solutions with Hydrolytic Lignin

2011 ◽  
pp. 105-115
Author(s):  
Keyword(s):  
Acid Medium ◽  
Alkaline Medium ◽  
Active Substance ◽  
Physical Adsorption ◽  
Surface Active Substance ◽  
Chemical Adsorption ◽  
Water Solutions ◽  
Hydrolytic Lignin ◽  
Surface Active ◽  
Active Substances

Regularities of akyltrimethylammoniachloride sorption abstraction from water solutions with hydrolytic lignin have been studied. Two characteristic pH areas of a cation surface-active substance concentration different in the nature of sorbate/sorbent interaction have been singled out. In the acid medium the sorbate’s adsorption by hydrolytic lignin takes place due to physical adsorption. In the subacid and alkaline medium the sorbate/sorbent interaction occurs due to chemical adsorption.

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