Effect of calcon carboxylic acid on association process of vanadyl sulfate in water‐N, N‐dimethyl formamide mixed solvents

2017 ◽  
Vol 11-12 ◽  
pp. 67-76
Author(s):  
E.A. Gomaa ◽  
R.R. Zaky ◽  
A. Shokr
Keyword(s):  
Carboxylic Acid ◽  
Mixed Solvents ◽  
Vanadyl Sulfate ◽  
Dimethyl Formamide ◽  
Calcon Carboxylic Acid

Pulse polarographic study of the behaviour of some o,o'-dihydroxyazo-compounds

1989 ◽  
Vol 54 (5) ◽  
pp. 1219-1226 ◽  
Author(s):  
Enric Casassas ◽  
Miquel Esteban ◽  
Santiago Alier
Keyword(s):  
Carboxylic Acid ◽  
Reaction Mechanisms ◽  
Sulphonic Acid ◽  
Base Catalysis ◽  
Polarographic Study ◽  
Acid Base ◽  
Eriochrome Black T ◽  
Naphthoic Acid ◽  
Calcon Carboxylic Acid

The reduction of several o,o'-dihydroxyazo-compounds is studied by means of pulse polarographic techniques (DPP, NPP and RPP). The compounds studied are the following: 2-(2'-hydroxyphenylazo)-phenol (o,o'-dihydroxyazobenzene), 1-(2'-hydroxy-1'-naphthylazo)-2-naphthol-4-sulphonic acid (calcon or Eriochrome Blue Black R), 1-(2'-hydroxy-4'-sulpho-1'-naphthylazo)-2-hydroxy-3-naphthoic acid (calcon carboxylic acid), and 1-(1'-hydroxy-2'-naphthylazo)-6-nitro-2-naphthol-4-sulphonic acid (Eriochrome Black T). Correlations between Ip and Epand experimental variables (pH, T, conc.) and instrumental parameters (dropping time, t, and pulse magnitude, ΔE) are established. Reaction mechanisms formerly proposed are discussed on the basis of the new obtained results, and the ranges are defined where adsorption and/or acid-base catalysis are operative.

The dimethyl formamide – acyl halide complex and its application to the synthesis of acyl azides

1967 ◽  
Vol 45 (11) ◽  
pp. 1247-1251 ◽  
Author(s):  
Donald E. Horning ◽  
Joseph M. Muchowski
Keyword(s):  
Carboxylic Acid ◽  
Acid Chloride ◽  
Direct Conversion ◽  
Dimethyl Formamide ◽  
Acid Salt ◽  
Acyl Halide ◽  
Acyl Azides ◽  
Selective Formation ◽  
Carboxylic Acid Salt ◽  
Acid Azide

A description of the conditions which favor the formation of the acid chloride – dimethyl formamide complex is given. The utility of the complex is illustrated by its application to the synthesis of acyl azides and, in particular, by the selective formation of 3-bromopropionyl azide from the corresponding acid chloride. The complex also results from a carboxylic acid salt and N,N-dimethyl chloroformiminium chloride, and thus provides an alternative method of effecting the direct conversion of a carboxylic acid into the corresponding acid azide.

Effect of Solution Properties on Electrospun Chlorinated Polyvinyl Chloride Nanofibers

2014 ◽  
Vol 1033-1034 ◽  
pp. 1020-1023
Author(s):  
Chun Mei Qiao ◽  
Ting Ting Jiang ◽  
Yin Ling Zhang ◽  
Wei Min Kang
Keyword(s):  
Electron Microscopy ◽  
Polyvinyl Chloride ◽  
Mixed Solvent ◽  
Mixed Solvents ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Dimethyl Formamide ◽  
Electrospun Fibers ◽  
Solution Properties ◽  
Scanning Electron

A kind of novel biodegradable Chlorinated Polyvinyl Chloride (CPVC) nanofibers using a mixture of Dimethyl Formamide (DMF) and Tetrahydrofuran (THF) as solvent were prepared by electrospinning process in this paper. The morphology of electrospun CPVC nanofiber nonwovens were investigated by scanning electron microscopy (SEM). Results indicated that the morphology and diameter of the electrospun fibers were influenced by CPVC solution concentration and the THF amount in the mixed solvents, and the finer and uniform nanofibers were electrospun from a mixed solvent of DMF and THF with ratio of 3/1(w/w).

High Sensitive Sensor Based on Carbon Nanotube Electrode for Determination of Lanthanum in the Presence of Calcon Carboxylic Acid

2013 ◽  
Vol 46 (1) ◽  
pp. 156-170 ◽  
Author(s):  
Sayed Mehdi Ghoreishi ◽  
Mohsen Behpour ◽  
Samaneh Mazaheri ◽  
Mohammadhassan Motaghedifard
Keyword(s):  
Carbon Nanotube ◽  
Carboxylic Acid ◽  
Sensitive Sensor ◽  
Calcon Carboxylic Acid

En face dual fluorescence staining of fatty streaks allows observation of initiation and progression of atherosclerotic lesions

1995 ◽  
Vol 53 ◽  
pp. 864-865
Author(s):  
Anne M. Klinkner ◽  
Crystal R. Waites ◽  
Peter J. Bugelski ◽  
William D. Kerns
Keyword(s):  
Fluorescent Dyes ◽  
Nile Red ◽  
Dimethyl Formamide ◽  
High Cholesterol Diet ◽  
Methods Development ◽  
Atherosclerotic Lesions ◽  
En Face ◽  
Biochemical Evaluation ◽  
Stock Solutions ◽  
Dual Staining

A primary effort in the understanding of the progression of atherosclerotic disease has been methods development for visualization of the atherosclerotic plaque. We introduce a new method for the qualitative analysis of lipids in atherosclerotic fatty streaks which also retains those lipids for biochemical evaluation. An original aspect of the process is the ability to view an entire fatty streak en face, selectively stained for specific lipid classes within the lesion.New Zealand white rabbits were fed a high cholesterol diet(0.15%-0.3% for 14 wks). The aorta was removed and fixed in Carson's phosphate buffered formaldehyde followed by dual staining in the fluorescent dyes Nile red and filipin. Stock solutions of nile red(0.5mg/ml acetone) and filipin(2.5mg/ml dimethyl formamide) were prepared and kept at -20°C; all subsequent steps were at RT. 0.5cm × 1.0cm pieces of aorta were trimmed and adventitia removed. The pieces were then washed 3×15 min in PBS w/o CaMg, soaked in Nile red(NR)/filipin(Fl) stain(100(il NR stock + 200μl Fl stock in 10 ml PBS for 30 min, washed in PBS 3×30 min, rinsed with distilled water, mounted(Crystal Mount, Biomedia) and coverslipped and viewed by fluorescence microscopy.

Fibrinolytic Activity of Cerebro-Spinal Fluid and the Development of Artificial Cerebral Haematomas in Dogs

1969 ◽  
Vol 21 (02) ◽  
pp. 294-303 ◽  
Author(s):  
H Mihara ◽  
T Fujii ◽  
S Okamoto
Keyword(s):  
Cerebrospinal Fluid ◽  
Carboxylic Acid ◽  
Fibrinolytic Activity ◽  
Clinical Implications ◽  
Trans Form ◽  
Plate Method ◽  
Blood Samples ◽  
Fibrin Plate ◽  
The Brain

SummaryBlood was injected into the brains of dogs to produce artificial haematomas, and paraffin injected to produce intracerebral paraffin masses. Cerebrospinal fluid (CSF) and peripheral blood samples were withdrawn at regular intervals and their fibrinolytic activities estimated by the fibrin plate method. Trans-form aminomethylcyclohexane-carboxylic acid (t-AMCHA) was administered to some individuals. Genera] relationships were found between changes in CSF fibrinolytic activity, area of tissue damage and survival time. t-AMCHA was clearly beneficial to those animals given a programme of administration. Tissue activator was extracted from the brain tissue after death or sacrifice for haematoma examination. The possible role of tissue activator in relation to haematoma development, and clinical implications of the results, are discussed.

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