Chlorosulfonic Acid-based Room Temperature Chemical Expansion Route for the Bulk Production of Graphite Nanoplatelets

2013 ◽  
Vol 21 (2) ◽  
pp. 149-157 ◽  
Author(s):  
İbrahim Mutlay ◽  
Lucian Barbu Tudoran
Keyword(s):  
Room Temperature ◽  
Chlorosulfonic Acid ◽  
Graphite Nanoplatelets ◽  
Chemical Expansion ◽  
Bulk Production

scholarly journals Regioselective Thiocyanation of Aromatic and Heteroaromatic Compounds Using [2-(Sulfooxy)ethyl]sulfamic Acid as an Efficient, Recyclable Organocatalyst and Novel Difunctional Brønsted Acid

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Sami Sajjadifar ◽  
Saaid Karimian ◽  
Hadi Noorizadeh ◽  
Hojat Veisi
Keyword(s):  
Hydrogen Peroxide ◽  
Aromatic Amines ◽  
Room Temperature ◽  
Simple Procedure ◽  
Sulfamic Acid ◽  
Chlorosulfonic Acid ◽  
Substituted Anilines ◽  
Heteroaromatic Compounds ◽  
Reaction Cycles ◽  
Considerable Loss

A green and simple procedure for the thiocyanation of aromatic and heteroaromatic compounds is described. [2-(Sulfooxy)ethyl]sulfamic acid (SESA) (supported on silica) is easily produced by addition of chlorosulfonic acid to 2-aminoethanol and this catalyst is applied as an efficient, reusable, and heterogeneous catalyst for the thiocyanation of heterocycles, substituted anilines (electron-rich and electron-deficient), and N,N-disubstituted aromatic amines using hydrogen peroxide in the water : ethanol as a solvent at room temperature. The catalyst can be easily recovered and reused for five reaction cycles without considerable loss of activity.

scholarly journals AN EFFICIENT SYNTHESIS OF GEM-DIHYDROPEROXIDES AND 1,2,4,5-TETRAOXANES CATALYZED BYCHLOROSULFONIC ACIDAS A NEW CATALYST

2015 ◽  
Vol 11 (3) ◽  
pp. 3381-3390 ◽  
Author(s):  
Kaveh Khosravi ◽  
Atefeh Asgari
Keyword(s):  
Hydrogen Peroxide ◽  
Room Temperature ◽  
Low Cost ◽  
Chlorosulfonic Acid ◽  
Solid Catalyst ◽  
Efficient Synthesis ◽  
Aqueous Hydrogen Peroxide

Chlorosulfonic acid was used as an active, low-cost and reusable solid catalyst for conversion of ketones and aldehydes to corresponding gem-dihydroperoxides using 30% aqueous hydrogen peroxide at room temperature. The reactions proceed with high rates and excellent yields.

Koenigs-Knorr Synthesis of Natural and Potential Metabolites of Cholesteryl Hexosides

2008 ◽  
Vol 59 (10) ◽  
Author(s):  
Silvia Iga ◽  
Dumitru Petru Iga ◽  
Nicoleta Florentina Predescu ◽  
Adrian Iga ◽  
Alina Nicolescu
Keyword(s):  
High Temperature ◽  
Spectroscopic Data ◽  
Nmr Spectra ◽  
Room Temperature ◽  
General Scheme ◽  
Chlorosulfonic Acid ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr ◽  
Characteristic Methods ◽  
Per Se

The following glycosides of cholesterol have been synthesized: a-D-galactofuranoside, �-D-glucopyranoside, bis-sulfo-3,6-b-D-glucopyranoside. 1-a-Bromides of protected sugars were used as glycosylation donors: tetra-O-benzoyl-D-galactofuranosyl and tetra-O-acetyl-D-glucopyranosyl. Peracylated sugars, i. e., precursors of sugar bromides, were synthesized in conditions that preferentially facilitated the envisaged ring: room temperature for pyranosic ring, high temperature for furanosic one. Constantly, cadmium carbonate was used as promotor. As a general scheme of work, glycosylation mixture was submitted to Zemplen saponification and the obtained glycolipids have been separated by characteristic methods. The glucoside of cholesterol was sulfated with chlorosulfonic acid in pyridine. Neutral or acidic glycolipids were characterized per se by chromatographic and chemical means as well as by IR spectroscopy. Sulfatide and galactocerebroside of rat brain and ganglioside GM4 of rooster testis were used as reference compounds. Alternatively, the synthesized glycosides were peracetylated and their 1H and 13C NMR spectra registered. New NMR spectroscopic data are presented for cholesteryl-a-D-galactofuranoside and -bis-sulfo-6-b-D-glucopyranoside.

Silica-bonded S-sulfonic acid as a recyclable catalyst for the silylation of hydroxyl groups with hexamethyldisilazane (HMDS)

2010 ◽  
Vol 88 (2) ◽  
pp. 164-171 ◽  
Author(s):  
Khodabakhsh Niknam ◽  
Dariush Saberi ◽  
Hajar Molaee ◽  
Mohammad Ali Zolfigol
Keyword(s):  
Sulfonic Acid ◽  
Room Temperature ◽  
Reaction Times ◽  
Chlorosulfonic Acid ◽  
Hydroxyl Groups ◽  
Secondary Alcohols ◽  
Mild Conditions ◽  
Trimethylsilyl Ethers ◽  
Phenolic Hydroxyl Groups ◽  
Good Range

Silica-bonded S-sulfonic acid (SBSSA) was prepared by the reaction of 3-mercaptopropylsilica (MPS) and chlorosulfonic acid in tert-butylmethyl ether, and used as a catalyst for the silylation of hydroxyl groups. A good range of primary, secondary alcohols and phenolic hydroxyl groups were effectively converted into their corresponding trimethylsilyl ethers with hexamethyldisilazane (HMDS) in the presence of catalytic amounts of SBSSA under mild conditions at room temperature with short reaction times and in good-to-excellent yields. An excellent chemoselective silylation of hydroxyl groups in the presence of other functional groups was also observed. The heterogeneous catalyst was recycled for 30 runs upon the reaction of benzyl alcohol with HMDS without lossing its catalytic activity.

scholarly journals Synthesis of 2-aryl-1-arylmethyl-1H-benzimidazoles using chlorosulfonic acid at room temperature

2016 ◽  
Vol 9 ◽  
pp. S858-S860 ◽  
Author(s):  
Nana V. Shitole ◽  
Kirti S. Niralwad ◽  
Bapurao B. Shingate ◽  
Murlidhar S. Shingare
Keyword(s):  
Room Temperature ◽  
Chlorosulfonic Acid

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Hepatocyte Alterations in Guinea Pigs FED Polychlorinated Biphenyls (PCBs), Dibenzodioxins (PCDD), AND DIBENZOFURANS (PCDF)

1982 ◽  
Vol 40 ◽  
pp. 56-57
Author(s):  
J. N. Turner ◽  
D. N. Collins
Keyword(s):  
Guinea Pigs ◽  
Room Temperature ◽  
Dose Group ◽  
Methyl Cellulose ◽  
Uranyl Acetate ◽  
Target Organ ◽  
Office Building ◽  
Lead Citrate ◽  
Control Groups ◽  
Cooling Fluid

A fire involving an electric service transformer and its cooling fluid, a mixture of PCBs and chlorinated benzenes, contaminated an office building with a fine soot. Chemical analysis showed PCDDs and PCDFs including the highly toxic tetra isomers. Guinea pigs were chosen as an experimental animal to test the soot's toxicity because of their sensitivity to these compounds, and the liver was examined because it is a target organ. The soot was suspended in 0.75% methyl cellulose and administered in a single dose by gavage at levels of 1,10,100, and 500mgm soot/kgm body weight. Each dose group was composed of 6 males and 6 females. Control groups included 12 (6 male, 6 female) animals fed activated carbon in methyl cellulose, 6 males fed methyl cellulose, and 16 males and 10 females untreated. The guinea pigs were sacrificed at 42 days by suffocation in CO2. Liver samples were immediately immersed and minced in 2% gluteraldehyde in cacadylate buffer at pH 7.4 and 4°C. After overnight fixation, samples were postfixed in 1% OsO4 in cacodylate for 1 hr at room temperature, embedded in epon, sectioned and stained with uranyl acetate and lead citrate.

Domain Formation in Synthetic Quartz

1971 ◽  
Vol 29 ◽  
pp. 156-157
Author(s):  
Joseph J. Comer
Keyword(s):  
Electron Beam ◽  
Room Temperature ◽  
Domain Formation ◽  
Synthetic Quartz ◽  
Transmission Electron ◽  
Black Spots ◽  
Diffraction Mode ◽  
Domain Boundaries ◽  
Kikuchi Lines ◽  
Straight Lines

Domains visible by transmission electron microscopy, believed to be Dauphiné inversion twins, were found in some specimens of synthetic quartz heated to 680°C and cooled to room temperature. With the electron beam close to parallel to the [0001] direction the domain boundaries appeared as straight lines normal to <100> and <410> or <510> directions. In the selected area diffraction mode, a shift of the Kikuchi lines was observed when the electron beam was made to traverse the specimen across a boundary. This shift indicates a change in orientation which accounts for the visibility of the domain by diffraction contrast when the specimen is tilted. Upon exposure to a 100 KV electron beam with a flux of 5x 1018 electrons/cm2sec the boundaries are rapidly decorated by radiation damage centers appearing as black spots. Similar crystallographio boundaries were sometimes found in unannealed (0001) quartz damaged by electrons.

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