Photometric Determination of Chromium as Perchromic Acid in Ethyl Acetate Solution

1955 ◽  
Vol 27 (12) ◽  
pp. 2008-2009 ◽  
Author(s):  
Abraham Glasner ◽  
Menachem Steinberg
Keyword(s):  
Ethyl Acetate ◽  
Photometric Determination ◽  
Acetate Solution ◽  
Ethyl Acetate Solution

Spectrophotometric Determination of Capsaicin

1977 ◽  
Vol 60 (4) ◽  
pp. 970-972 ◽  
Author(s):  
José Jorge Ramos Palacio
Keyword(s):  
Ethyl Acetate ◽  
Rapid Method ◽  
Spectrophotometric Determination ◽  
Acetate Solution ◽  
Ethyl Acetate Solution

Abstract A rapid method has been developed for determining the pungency of hot paprika. Paprika is extracted with ethyl acetate, and an ethyl acetate solution of vanadium oxytrichloride is added just before reading at 720 nm. The method is sensitive for small quantities, i.e., less than 0.05%, and it is not necessary to isolate and purify the capsaicin.

scholarly journals Preparation and Photochromic Performance of Homogeneous Phase Nitrocellulose Membrane Grafting Spirooxazine Moieties

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 569
Author(s):  
Bin-Bin Sun ◽  
Bing-Hua Yao ◽  
Yang-Qing He ◽  
Bo Yang
Keyword(s):  
Ethyl Acetate ◽  
Acetate Solution ◽  
Ethyl Acetate Solution ◽  
Colored Form ◽  
Isobutyl Ketone ◽  
Photochromic Properties ◽  
Photochromic Behavior ◽  
Reaction Rate Constants ◽  
13C Nuclear Magnetic Resonance ◽  
Relative Absorption

The synthesis of 1,3,3-trimethyl-9′-acryloxyspiro[indoline-2,3′(3H)naphtho[2,1-b][l,4]-oxazine] (AISO) was carried out by catalytic esterification of 1,3,3-trimethyl-9′-hydroxyspiro-[indoline-2,3′(3H)naphtho[2,1-b][l,4]oxazine] (SO–OH) and acrylic acid in the presence of 1,3-dicyclohexylcarbodiimide (DCC) and N-dimethylaminopyridine (DMAP). Then, the synthesis of the target copolymer (NC-g-AISO) was was carried out by benzoyl peroxide (BPO)-induced graft copolymerization of the AISO monomer onto nitrocellulose (NC) in a homogeneous methyl isobutyl ketone medium. The structure of NC-g-AISO was characterized by Fourier transform infrared (IR) spectroscopy, 13C Nuclear Magnetic Resonance (NMR) spectra and thermogravimetric (TG) analysis. The photochromic properties of NC-g-AISO were investigated by examining UV–Vis spectra in ethyl acetate solution and solid membrane. Compared with the AISO monomer in ethyl acetate solution, the thermal color decay stability of the colored form of NC-g-AISO in ethyl acetate solution and in solid membrane improved significantly. The thermal color decay reaction rate constants in ethyl acetate solution and membrane at 25 °C were 1.77 × 10–2 and 1.36 × 10–3 s–1, respectively, fitted using the first-order reaction equation. After ten photochromic cycles, the relative absorption intensity of the colored form of NC-g-AISO decreased by 0.85%, indicating that the NC-g-AISO membrane has good reversible photochromic behavior.

Photometric determination of aluminium and zinc with salicylaldehyde semicarbazone

1984 ◽  
Vol 49 (6) ◽  
pp. 1468-1473 ◽  
Author(s):  
Záviš Holzbecher ◽  
Dagmar Lipská
Keyword(s):  
Ethyl Acetate ◽  
Fluorescence Spectra ◽  
Photometric Determination ◽  
Optimum Conditions ◽  
Fluorometric Determination ◽  
Limit Of Determination ◽  
Relative Standard ◽  
Tenfold Excess ◽  
Masking Agents

The effect of some tensides on the absorption, excitation, and fluorescence spectra of Al and Zn complexes of salicylaldehyde semicarbazone in aqueous-alcoholic solutions and on their extractability into ethyl acetate has been studied. The shape of the absorption spectra is unaffected by the presence of the tensides while the time of the complex formation is shorter. The complexes are extractable into ethyl acetate in the presence of the anionactive tenside tested, sodium lauryl sulphate. The optimum conditions for the spectrophotometric and fluorometric determination of Al and Zn have been established. The limit of determination is 2 ng ml-1 (pH 3.8-4.8) for Al and 50 ng ml-1 (pH 8.4-8.6) for Zn. Using thiosulphate or fluoride as masking agents, Zn can be determined in a concentration of 2 μg ml-1 in the presence of the same quantity of Al or Cu, or in the presence of a tenfold excess of Fe, with a relative standard deviation of 1.5%.

scholarly journals 4,5-Dichloro-3H-1,2-dithiol-3-one

IUCrData ◽  
2016 ◽  
Vol 1 (11) ◽  
Author(s):  
Khaled Boukebbous ◽  
El Adoui Laifa ◽  
Aimery De Mallmann ◽  
Mostafa Taoufik
Keyword(s):  
Ethyl Acetate ◽  
Carbonyl Group ◽  
Torsion Angle ◽  
Title Compound ◽  
Expected Value ◽  
Planar Geometry ◽  
Acetate Solution ◽  
Ethyl Acetate Solution ◽  
Monoclinic System ◽  
Bond Lengths

The crystallization from an ethyl acetate solution of the title compound, also known as dichloro-1,2-dithiacyclopentenone, C3Cl2OS2, leads to a monoclinic system withP21/nspace group. The molecule displays an almost planar geometry, with a torsion angle of −2.1 (1)° for the endocyclic C—C—S—S fragment. The S—S and C=O bond lengths are 2.0521 (8) and 1.212 (3) Å, respectively. The endocyclic S—C—C angle sustained by the carbonyl group, 110.94 (16)°, deviates from the expected value of 120° for ansp2-hybridized C atom. In the crystal, short S...S, S...Cl, S...O and Cl...Cl contacts are observed.

An Efficient Synthesis of Highly Substituted Spiro[Fluorene-9,3′-[1,2,4]Triazoles from the Reaction of N3-Substituted Amidrazones with (2,4,7-Trinitro-9H-Fluoren-9-Ylidene)Propanedinitrile

2018 ◽  
Vol 42 (3) ◽  
pp. 138-140 ◽  
Author(s):  
Mohsen A.-M. Gomaa ◽  
Huda A. Ali
Keyword(s):  
Ethyl Acetate ◽  
Ambient Temperature ◽  
Acetate Solution ◽  
Ethyl Acetate Solution ◽  
Efficient Synthesis

Novel spiro[fluorene-9,3′-[1,2,4]triazoles were obtained in excellent yields from the reaction of N3-substituted benzamidrazones and (2,4,7-trinitro-9 H-fluoren- 9-ylidene)propanedinitrile in ethyl acetate solution at ambient temperature. The react ion mechanism is discussed.

Synthesis and Application of New Carboxyl Modified Silicone Oil

2013 ◽  
Vol 631-632 ◽  
pp. 437-441
Author(s):  
Ning Lei ◽  
Qiu Feng An ◽  
Jiao Jiao Ning
Keyword(s):  
Maleic Anhydride ◽  
Ethyl Acetate ◽  
Silicone Oil ◽  
Raw Materials ◽  
Water Repellency ◽  
Acetate Solution ◽  
Ethyl Acetate Solution ◽  
Finishing Agent

A kind of new carboxyl and vinyl co-modified silicone oil (Vi-CAS-1) was synthesized with vinyl/amino co-modified silicone oil (Vi-ASO-1) and maleic anhydride (MA) as raw materials. Then 0.03 % Vi-CAS-1 in ethyl acetate solution was used as a finishing agent, the performance of Vi-CAS-1 on dacron fabrics was studied, and the effects of carboxyl equivalent, viscosity and the mole ratio of raw materials such as Vi-ASO-1 to MA on the Vi-CAS-1 performance were also investigated carefully. The results shows that, the elasticity and flexibility of fabrics treated by Vi-CAS-1 significantly increase. And when cooperate with the silicone which contains Si-H (PHMS-0.16 %) in application, the compounded Vi-CAS-1 can improve the fabric water-repellency to some extent, as compared with the fabric treated only with Vi-CAS-1.

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