CONTRIBUTION TO THE STUDY OF PYRAZOLONES

1953 ◽  
Vol 31 (7) ◽  
pp. 673-684 ◽  
Author(s):  
Paul E. Gagnon ◽  
Jean L. Boivin ◽  
Méüde Tremblay
Keyword(s):  
Acetic Acid ◽  
Absorption Spectra ◽  
Ultraviolet Absorption ◽  
Acid Solutions

1,4-Diphenyl-3-carbethoxy-5-aminopyrazole yielded 1,4-diphenyl-5-aminopyrazole by hydrolysis and decarboxylation. The phenylhydrazone of ethyl phenyloxalacetate gave a pyrazolone which was transformed into 1,4-diphenyl-3-amino-5-pyrazolone. The 2,4-diphenyl-3-amino-5-pyrazolone was obtained from ethyl phenylcyanoacetate and phenylhydrazine by heating in acetic acid. 4-Alkyl-3-hydroxy- and 3-amino-5-pyrazolones and 4,4-dialkyl-3-oxo- and 3-imino-5-pyrazolones, substituted in position 2 by carbanilino or α- or β-naphthyl groups, were prepared from ethyl mono- or disubstituted malonates and cyanoacetates, 4-phenylsemicarbazide, and α- and β-naphthylhydrazines. Ultraviolet absorption spectra were determined in neutral and acid solutions.

THE ULTRAVIOLET ABSORPTION SPECTRA OF NITRIC ACID SOLUTIONS

1949 ◽  
Vol 27b (6) ◽  
pp. 580-603 ◽  
Author(s):  
R. Norman Jones ◽  
G. Denis Thorn
Keyword(s):  
Acetic Acid ◽  
Nitric Acid ◽  
Absorption Spectra ◽  
Ammonium Acetate ◽  
Potassium Nitrate ◽  
Ultraviolet Spectrum ◽  
Ultraviolet Absorption ◽  
Acid Solutions ◽  
Nitric Acid Solutions ◽  
Nitrogen Pentoxide

The ultraviolet absorption spectra of binary mixtures of nitric acid, water, acetic acid, acetic anhydride, and nitrogen pentoxide have been investigated over the ranges of concentration in which the systems exhibit sufficient chemical stability. The variations in the spectra are considered in relation to the other physical properties of the systems, as reported in the literature. The ultraviolet spectrum of nitric acid in the presence both of nitrogen pentoxide and water is interpreted in terms of a series of equilibria which involve the nitrate (NO3−) and nitronium (NO2+) ions and associated and nonassociated neutral molecules. The specific gravities of anhydrous nitric acid solutions of ammonium nitrate, potassium nitrate, ammonium acetate, acetic acid at 20 ± 0.1 °C. and of nitrogen pentoxide at 25 ± 0.1 °C. are also reported.

ULTRAVIOLET, INFRARED, AND RAMAN SPECTRA OF PROTONATED CARBOXYLIC ACIDS

1966 ◽  
Vol 44 (16) ◽  
pp. 1961-1965 ◽  
Author(s):  
Sumie Hoshino ◽  
Haruo Hosoya ◽  
Saburo Nagakura
Keyword(s):  
Acetic Acid ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Ultraviolet Absorption ◽  
Carboxyl Group ◽  
Infrared And Raman Spectra ◽  
Acid Solutions ◽  
Carboxylate Group ◽  
Absorption Change ◽  
Sulfuric Acid Solutions

Ultraviolet, infrared, and Raman spectra were measured for acetic acid and propionic acid in sulfuric acid solutions of various acidities. Infrared spectra of acetic acid and benzoic acid were measured in deuterosulfuric acid and aqueous deuterated sodium hydroxide solutions. From the detailed analyses of the ultraviolet absorption change the pKBH+ values of acetic and propionic acids were found to be −6.12 and −6.33, respectively. In the infrared and Raman spectra of the protonated acids, the C=O stretching band at about 1700 cm−1 disappeared and a new strong infrared absorption band appeared at about 1600 cm−1. The frequency of the latter band, which can be assigned to antisymmetric C—O stretching band, is very similar to that of the carboxylate group. The acidity dependence of these infrared spectra was parallel with that of the ultraviolet absorption. These facts confirm that the protonated carboxyl group has a skeleton [—C(OH)2]+ similar to the carboxylate group [—CO2]−.

SYNTHESIS AND ULTRAVIOLET ABSORPTION OF SOME PYRAZOLONES

1951 ◽  
Vol 29 (10) ◽  
pp. 843-847 ◽  
Author(s):  
P. E. Gagnon ◽  
B. Nolin ◽  
R. N. Jones
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Light ◽  
Alkaline Medium ◽  
Light Absorption ◽  
Ultraviolet Absorption ◽  
Acid Solutions

Thirteen 3-amino-5-pyrazolones substituted only in position 4 have been synthesized from the corresponding mono- or disubstituted cyanoacethydrazides or cyanoacetic esters in alkaline medium. Their ultraviolet light absorption spectra have been determined in neutral and acid solutions.

FAR ULTRAVIOLET ABSORPTION SPECTRA OF N3AND N2+GENERATED BY ELECTRONS IMPACTING GASEOUS N2

2013 ◽  
Vol 779 (1) ◽  
pp. 40 ◽  
Author(s):  
Yu-Jong Wu ◽  
Hui-Fen Chen ◽  
Shiang-Jiun Chuang ◽  
Tzu-Ping Huang
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption ◽  
Far Ultraviolet

scholarly journals ULTRAVIOLET ABSORPTION SPECTRA AT REDUCED TEMPERATURES

1950 ◽  
Vol 187 (1) ◽  
pp. 299-312
Author(s):  
R.L. Sinsheimer ◽  
J.F. Scott ◽  
J.R. Loofbourow
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption

Durability of Red Mud Based Geopolymer Paste in Acid Solutions

2016 ◽  
Vol 866 ◽  
pp. 99-105 ◽  
Author(s):  
Smita Singh ◽  
M.U. Aswath ◽  
R.V. Ranganath
Keyword(s):  
Mechanical Properties ◽  
Acetic Acid ◽  
Fly Ash ◽  
Red Mud ◽  
Acetic Acid Solution ◽  
Strength Loss ◽  
Acid Solutions ◽  
Test Results ◽  
Acid Attack ◽  
Geopolymer Paste

The present investigation is on the effect of red mud on the mechanical properties and durability of the geopolymer paste in sulphuric and acetic acid solution. Red mud and fly ash were used to form the geopolymer paste along with the alkalies. The variation of red mud in the paste composition was from 0% to 90%. Cylindrical shaped specimens of 1 inch diameter and 1 inch height were prepared. The specimens were immersed in 5% sulphuric acid and 5% acetic acid for 1, 7, 14, 28, 56 and 84 days and tested for weight loss, visual deformation, strength loss and colour of the solvent, based on the procedure specified by ASTM C 267 – 01. SEM/EDX Tests were performed on the geopolymer specimens. Test results show that initially, the strength of the geopolymer increased upon the addition of red mud. The strength was maximum when the percentage of red mud was 30%. The maximum strength obtained was 38 MPa for the paste containing 30% red mud using 10M alkali solution as against 31.69 MPa, when only fly ash was used. Geopolymer paste containing 30% and 50% red mud showed better resistance to acid attack. The strength loss was minimum for the samples containing 30% red mud in both inorganic and organic acid i.e. sulphuric and acetic acid.

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