Total oxidation of decahydroxypillar[5]arene with copper(II) and iron(III) nitrates

2020 ◽  
Vol 63 (7) ◽  
pp. 19-23
Author(s):  
Vladimir V. Gorbachuk ◽  
◽  
Anna R. Marysheva ◽  
Ivan I. Stoykov ◽  
◽  
...  
Keyword(s):  
Acetic Acid ◽  
Glacial Acetic Acid ◽  
Electrochemical Sensors ◽  
Building Blocks ◽  
Ammonium Persulfate ◽  
Proton Donor ◽  
Oxidation Products ◽  
Proton Acceptor ◽  
Total Oxidation ◽  
Macrocyclic Cavity

Pillar[n]arenes are suitable synthetic platforms for synthesis of functionalized p-cyclophanes, versatile building blocks for creating supramolecular polymers and (pseudo)rotaxanes. The presence of hydroquinone fragments in unsubstituted pillar[n]arene derivatives opens wide opportunities for their application in electrochemical sensors and for their use as reducing agents for synthesis of hybrid materials. Macrocyclic cavity plays the key role in molecular recognition, supramolecular self-assembly of pillararenes, and therefore possibility of switching electron donor properties of aromatic moieties, forming macrocyclic cavity presents specific interest. Synthesis of pillar[n]quinones is non-trivial goal, usually, it requires expensive reagents (сerium(IV) ammonium nitrate). As an oxidized compound alkoxy-derivatives of pillararenes are used. While possibility of red-ox transitions of decahydroxypillar[5]arene are well known, to the date in literature there are no examples of total oxidation of decahydroxypillar[5]arene. We have studied interaction of decahydroxy-pillar[5]arene with a row of inorganic oxidants: catalytic oxidation with air oxygen in presence of copper(II) and iron(III) nitrates, and oxidation with ammonium persulfate. In order to find the optimal conditions for oxidation of pillar[5]arene the series of solvents were tried (proton donor alcohols and acetic acid, proton acceptor dimethylformamide and dimethylsulfoxide). It was established that using glacial acetic acid as a solvent with ultrasonication leads to total oxidation of pillar[5]arene to pillar[5]quinone. This fact is explained by strong proton-donor properties of glacial acetic acid, to prevent formation of insoluble quinhydrone complexes of pillar[5]arene oxidation products. Using ammonium persulfate does not lead to the product of total oxidation.

Snapping Together: Condensation Polymerization

Reactions ◽  
2011 ◽  
Author(s):  
Peter Atkins
Keyword(s):  
Acetic Acid ◽  
Protein Molecule ◽  
Proton Donor ◽  
The Other ◽  
Structural Motif ◽  
Proton Acceptor ◽  
Close Relative ◽  
Condensation Polymerization ◽  
A Chain ◽  
The One

One of the most famous of all plastics is nylon. I shall use it to represent how the second type of polymers is made. There are many varieties of nylon, but it will be enough to consider just one exemplar, the one known as ‘nylon-66’. It is so called because the repeating motif is a chain of six carbon atoms, then a group of atoms that provide a link, and then another chain of six carbon atoms. The pattern C6-link-C6 is repeated indefinitely to give the ‘66’ polymer. As you will see in more detail in Reaction 27, nylon is a very primitive version of a protein-like molecule, the molecules that control all bodily process and also form claws, nails, and hair. A protein molecule has the same links but more varied combinations of carbon atoms. It is, however, an interesting point that we clad our exteriors in material that emulates our interiors. One of the molecules used to build the polymer is 1 (on the next page; note the six C atoms). As it happens, this molecule is a close relative, with four and five C atoms respectively instead of six, of the two compounds cadaverine and putrescine, with names indicate their origin and odour. Thus, not only does nylon emulate the living, but we clad ourselves in molecules akin to the odour of death. The other molecule we need is 2 (note the six C atoms again). The task of the nylon manufacturer is to link the –NH2 end of one molecule to the –COOH end of the other molecule, then doing it over and over again to grow long spindly polymer molecules. You know from Reaction 2 that NH3 is a base (a proton acceptor), so you should be able to accept that the –NH2 business end of molecule 1 is also a base. Similarly, you saw in the same discussion that –COOH is a structural motif of acetic acid, an acid (a proton donor), so you should be able to see that the business end of molecule 2 is an acid.

scholarly journals Oxidation of Zhundong subbituminous coal in aqueous Fe2+/ glacial acetic acid solution with H2O2

2020 ◽  
Author(s):  
Shuai Chen ◽  
Wei Zhou ◽  
Guang-Bo Zhao ◽  
Jihui Gao
Keyword(s):  
Acetic Acid ◽  
Organic Nitrogen ◽  
Glacial Acetic Acid ◽  
Acetic Acid Solution ◽  
Oxidation Products ◽  
Gas Chromatography Mass Spectrometry ◽  
Mild Oxidation ◽  
Aromatic Rings ◽  
Sulfur Species ◽  
Liquid Products

Abstract The improvement of the reactivity of H2O2 and Zhundong subbituminous coal (ZS) was focused on in this work. The mild oxidation of ZS was carried out under different conditions. The liquid oxidation products were analyzed using gas chromatography /mass spectrometry (GC/MS). The results suggest that Fe2+ and glacial acetic acid (GAA) have a synergistic effect on the H2O2 oxidation of ZS, which can significantly promote the conversion of ZS and the production of liquid products. In total, 40 compounds are identified, which could be categorized as 8 group components. Most of them are valued-added chemicals. Among the detected compounds, carboxylic acids (CAs) is the most abundant, accounting for 47.22% of all the group components in TRC. Moreover, according to the compounds detected by GC/MS, condensed aromatic rings are significantly abundant than aliphatic moieties in organic matter of ZS. -CH2CH2- are predominant bridged linkages connecting aromatic rings in ZS. The existing forms of organic nitrogen and sulfur species contain quinolins, pyrroles, pyrimidins, quinoxalines, enamides, oxazoles, isoquinolines, thiazols, sulfonamides in ZS.

Synthesis and Caracterization of some New 1H-3-aryl-7-etoxycarbonyl-6-methyl-pyrazolo[5,1-c][1,2,4]triazoles

2008 ◽  
Vol 59 (1) ◽  
pp. 41-44
Author(s):  
Maria-Daniela Sofei ◽  
Maria Ilici ◽  
Valentin Badea ◽  
Carol Csunderlik ◽  
Vasile-Nicolae Bercean
Keyword(s):  
Mass Spectrometry ◽  
Acetic Acid ◽  
Nmr Spectroscopy ◽  
Sodium Acetate ◽  
Glacial Acetic Acid ◽  
Ir And Nmr Spectroscopy

The synthesis of 1H-3-aryl-7-ethoxycarbonyl-6-methyl-pyrazolo[5,1-c][1,2,4]triazoles (2) was carried out by cyclization of 1H-5-arylidenehydrazino-4-ethoxycarbonyl-3-methyl-pyrazoles (1) in the presence of bromine using glacial acetic acid as solvent and sodium acetate as base. The new nine obtained compounds were characterized by IR and NMR spectroscopy and mass spectrometry.

Coordination state of cobalt(II) ions in solution and on a sulphonated organic polymer

1979 ◽  
Vol 44 (8) ◽  
pp. 2330-2337 ◽  
Author(s):  
Jindřiška Maternová ◽  
Anastas A. Andreev ◽  
Dimitrii M. Shopov ◽  
Karel Setínek
Keyword(s):  
Acetic Acid ◽  
Coordination Sphere ◽  
Glacial Acetic Acid ◽  
Organic Polymer ◽  
Octahedral Complex ◽  
Coordination State ◽  
Tetrahedral Symmetry ◽  
Liquid Acid ◽  
Homogeneous Phase ◽  
Bromide Ion

It was found spectroscopically that cobalt(II) acetate dissolved in glacial acetic acid forms the octahedral complex [Co(OAc)2(HOAc)4] which in the presence of bromide ions gives the octahedral [Co(OAc)Br(HOAc)4] and tetrahedral bromo(acetate)cobalt(II) complexes with the higher number of Br- ions. When attached to an organic polymer cobalt(II) ions are bonded in the form of octahedral [Co(H2O)6]2+ cations which form with acetic acid similar complexes as in homogeneous phase and are able to coordinate one bromide ion. Drying the copolymer possessing octahedral hexaaquocobalt(II) cations leads to tetrahedral aquocomplexes which are solvated by gaseous acetic acid and converted into the acetate complexes with the liquid acid. The latter contain the acid in the inner coordination sphere and have tetrahedral symmetry.

scholarly journals Nitration of Jharia basin coals, India: a study of structural modifications by XRD and FTIR techniques

2021 ◽  
Author(s):  
Prabal Boral ◽  
Atul K. Varma ◽  
Sudip Maity
Keyword(s):  
Acetic Acid ◽  
Nitric Acid ◽  
Linear Relationship ◽  
Glacial Acetic Acid ◽  
Vitrinite Reflectance ◽  
Aqueous Media ◽  
Interlayer Spacing ◽  
Acetic Acid Medium ◽  
X Ray ◽  
The Media

AbstractFour coal samples from Jharia basin, India are treated with nitric acid in glacial acetic acid and aqueous media to find out the chemical, petrographic and spatial structure of the organic mass by X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) techniques. X-ray parameters of coal like interlayer spacing (d002), crystallite size (Lc), aroamticity (fa), average number of aromatic layers (Nc), and coal rank (I26/I20) have been determined using profile-fitting software. Considerable variation is observed in treated coals in comparison to the demineralized coals. The d002 values of treated coals have increased in both the media showing increase in disordering of organic moieties. A linear relationship has been observed between d002 values with the volatile matter of the coals. Similarly, the d002 values show linear relationship with Cdmf contents for demineralized as well as for the treated coals in both the media. The Lc and Nc values have decreased in treated coals corresponding to demineralized coals. The present study shows that nitration in both the media is capable of removing the aliphatic side chains from the coals and aromaticity (fa) increases with increase in rank and shows a linear relationship with the vitrinite reflectance. The corresponding I26/I20 values are least for treated coals in glacial acetic acid medium followed by raw and then to treated coals in aqueous medium. FTIR studies show that coal arenes of the raw coals are converted into nitro-arenes in structurally modified coals (SMCs) in both the media, the corresponding bands at 1550–1490 and 1355–1315 cm−1 respectively. FTIR study confirms that nitration is the predominant phenomenon, though, oxidation and nitration phenomena takes place simultaneously during treatment with nitric acid to form SMCs. In comparison to raw coals, the SMCs show higher aromaticity and may be easily converted to coal derived products like activated carbon and specialty carbon materials.

scholarly journals Inhibitory Oxidation Products of Indole-3-acetic Acid

1965 ◽  
Vol 240 (6) ◽  
pp. 2612-2618
Author(s):  
Cecil C. Still ◽  
T.T. Fukuyama ◽  
H.S. Moyed
Keyword(s):  
Acetic Acid ◽  
Oxidation Products ◽  
Indole 3 Acetic Acid

HSCCC Separation of Three Main Compounds from the Crude Extract of Dracocephalum Tanguticum by Using Dimethyl Sulfoxide as Cosolvent

2020 ◽  
Author(s):  
Xue Yang ◽  
Yongling Liu ◽  
Tao Chen ◽  
Nana Wang ◽  
Hongmei Li ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Ethyl Acetate ◽  
Dimethyl Sulfoxide ◽  
Efficient Method ◽  
Crude Extract ◽  
High Speed ◽  
Glacial Acetic Acid ◽  
Butyl Alcohol ◽  
Preparative Hplc ◽  
Counter Current

Abstract Separation of natural compounds directly from the crude extract is a challenging work for traditional column chromatography. In the present study, an efficient method for separation of three main compounds from the crude extract of Dracocephalum tanguticum has been successfully established by high-speed counter-current chromatography (HSCCC). The crude extract was directly introduced into HSCCC by using dimethyl sulfoxide as cosolvent. Ethyl acetate/n-butyl alcohol/0.3% glacial acetic acid (4: 1: 5, v/v) system was used and three target compounds with purity higher than 80% were obtained. Preparative HPLC was used for further purification and three target compounds with purity higher than 98% were obtained. The compounds were identified as chlorogenic acid, pedaliin and pedaliin-6″-acetate.

Kinetics of the acid-catalyzed isomerization of phenylbutenes in glacial acetic acid

1972 ◽  
Vol 94 (4) ◽  
pp. 1247-1249 ◽  
Author(s):  
R. S. Schwartz ◽  
H. Yokokawa ◽  
E. W. Graham
Keyword(s):  
Acetic Acid ◽  
Glacial Acetic Acid ◽  
Acid Catalyzed ◽  
Kinetics Of
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