Reactions of Tertiary Hypohalites

1971 ◽  
Vol 49 (16) ◽  
pp. 2664-2671 ◽  
Author(s):  
V. Boido ◽  
O. E. Edwards
Keyword(s):  
Silver Oxide ◽  
Short Chain ◽  
Metallic Silver ◽  
Mercuric Oxide ◽  
Tertiary Alcohols ◽  
Convenient Synthesis ◽  
Homolytic Decomposition ◽  
Tertiary Alkyl

Metallic silver initiates short-chain homolytic decomposition of tertiary alkyl hypochlorites and hypobromites. Evidence is presented that the reaction of tertiary alcohols with silver oxide – mercuric oxide – bromine involves formation and homolytic decomposition of alkyl hypobromite followed by cyclization of γ-bromo alcohols. A convenient synthesis of tricyclo[4.3.1.03,8]decan-4-one (4-proto-adamantanone) is described.

Reactions of Chloramines with Ag(0) and Ag(I) States

1972 ◽  
Vol 50 (8) ◽  
pp. 1167-1180 ◽  
Author(s):  
O. E. Edwards ◽  
D. Vocelle ◽  
J. W. ApSimon
Keyword(s):  
Silver Oxide ◽  
Silver Ions ◽  
Silver Ion ◽  
Short Chain ◽  
Ferrous Ion ◽  
Metallic Silver ◽  
Nitrenium Ions ◽  
Homolytic Decomposition ◽  
Nitrogen Radicals ◽  
Silver Metal

Reactions of N-chloroazacyclooctane and N-chloroazacyclononane are described which give good yields of bicyclic amines. These are: (a) short chain homolytic reactions involving neutral nitrogen radicals initiated by ferrous ion or metallic silver; (b) apparent homogeneous reactions involving silver ion and bases; (c) reactions using silver oxide suspension which also require added bases.Both rate and product composition for (b) and (c) are sensitive to oxygen indicating that they are homolytic processes, probably initiated by traces of silver metal. No evidence for involvement of discrete nitrenium ions was found. However, reaction of N-chloroisoquinuclidine with silver ions has the character of a heterolytic process, giving products completely distinct from those from its homolytic decomposition. The addition of neutral piperidino radicals to styrene is described.

scholarly journals The catalytic combination of hydrogen and oxygen at the surface of platinum

1936 ◽  
Vol 156 (888) ◽  
pp. 284-306 ◽  
Keyword(s):  
Room Temperature ◽  
Quantitative Measurement ◽  
Silver Oxide ◽  
Catalytic Properties ◽  
Metallic Surface ◽  
Metallic Silver ◽  
Mercury Vapour ◽  
Platinum Surface ◽  
Gaseous Oxygen ◽  
Low Pressures

Research on the catalysis by metals of the combination of hydrogen and oxygen at low pressures was commenced in these laboratories by Cooper in 1923. Investigating the catalytic properties of a short platinum filament subjected to various pre-treatments by heating it electrically in hydrogen or oxygen or in vacuo , he found that the metallic surface thus cleaned became so active at room temperature as to render the quantitative measurement of the catalysed reaction impossible. It was discovered also that mercury vapour is a very potent poison of the surface, the enormously active clean platinum surface being rendered completely inactive by exposure to mercury vapour for a few minutes: a fact noted but apparently insufficiently emphasized in a paper published by Chapman and Hall in 1929. Owing to the difficulties involved in wording with a catalyst of such high activity, the research was discontinued in favour of an investigation of the same reaction using silver instead of platinum, a clean surface of this metal having been found to catalyse the reaction at a convenient rate at room temperature. The following facts were established:— (1) At the temperature of the laboratory a surface of metallic silver adsorbs completely a quantity of gaseous oxygen sufficient to form a complete unimolecular layer of silver oxide. This adsorbed oxygen cannot, of course, be removed by evacuation.

Silver Core - Silver Oxide Shell Nanoparticles Embedded on Mesostructured Silica Films

2008 ◽  
Vol 3 ◽  
pp. 103-114 ◽  
Author(s):  
Guadalupe Valverde-Aguilar ◽  
Jorge A. García-Macedo ◽  
Víctor Rentería-Tapia
Keyword(s):  
Silver Nanoparticles ◽  
Refractive Index ◽  
Optical Properties ◽  
Absorption Spectrum ◽  
Silver Oxide ◽  
High Refractive Index ◽  
Oxide Shell ◽  
Metallic Silver ◽  
Type I ◽  
Silver Core

Metallic silver particles in the nanometer size range were obtained in SiO2 matrix by the reduction of AgNO3 with the non-ionic diblock copolymer (Brij 58). Hexagonal mesostructured sol-gel films were synthesized by dip-coating method using the surfactant Brij58 to produce channels into the film, which house the silver nanoparticles. Optical properties of the metallic nanoparticles were studied by UV-Vis spectroscopy, TEM and HRTEM images. The experimental absorption spectrum of the metallic silver nanoparticles exhibits an absorption band located at 438 nm and a shoulder at longer wavelength. The TEM images show randomly distributed silver nanoparticles (Type I) along with some oriented as long line (Type II). Both distributions exhibit a silver oxide shell around of them. The second shell covering the silver core - silver oxide shell system is related to the surfactant. The optical absorption spectrum was modelled using the Gans theory. The fit shows two main contributions related to metallic silver nanoparticles with different axial ratios, and surrounding of a dielectric medium with high refractive index. Presence of the high refractive index silver oxide shell was confirmed by X-ray diffraction technique. The contributions of silver core and silver oxide shell play important roles in the optical properties of the films.

The Thermal Decomposition of Alkoxycarbonyl Thiocyanates and Isothiocyanates

1975 ◽  
Vol 53 (6) ◽  
pp. 907-912 ◽  
Author(s):  
Dennis Liotta ◽  
Robert Engel
Keyword(s):  
Thermal Decomposition ◽  
Primary Alcohols ◽  
Reduced Pressure ◽  
Tertiary Alcohols ◽  
Alkyl Amines ◽  
Tertiary Alkyl

Alkoxycarbonyl thiocyanates and isothiocyanates have been decomposed thermally under reduced pressure at temperatures of 240–375°. Primary systems yield primarily alkyl thiocyanates, whereas secondary and tertiary systems yield alkyl isothiocyanates. The viability of using this reaction in a conversion of primary alcohols to primary alkyl thiols and secondary and tertiary alcohols to tertiary alkyl amines is discussed.

scholarly journals Acetaldehyde Adsorption Characteristics of Ag/ACF Composite Prepared by Liquid Phase Plasma Method

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2344
Author(s):  
Byung-Joo Kim ◽  
Kay-Hyeok An ◽  
Wang-Geun Shim ◽  
Young-Kwon Park ◽  
Jaegu Park ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Photoelectron Spectroscopy ◽  
Silver Oxide ◽  
Activated Carbon Fiber ◽  
Metallic Silver ◽  
X Ray Diffraction ◽  
Adsorption Experiment ◽  
X Ray ◽  
Ag Particles ◽  
Liquid Phase Plasma

Ag particles were precipitated on an activated carbon fiber (ACF) surface using a liquid phase plasma (LPP) method to prepare a Ag/ACF composite. The efficiency was examined by applying it as an adsorbent in the acetaldehyde adsorption experiment. Field-emission scanning electron microscopy and energy-dispersive X-ray spectrometry confirmed that Ag particles were distributed uniformly on an ACF surface. X-ray diffraction and X-ray photoelectron spectroscopy confirmed that metallic silver (Ag0) and silver oxide (Ag2O) precipitated simultaneously on the ACF surface. Although the precipitated Ag particles blocked the pores of the ACF, the specific surface area of the Ag/ACF composite material decreased, but the adsorption capacity of acetaldehyde was improved. The AA adsorption of ACF and Ag/ACF composites performed in this study was suitable for the Dose–Response model.

scholarly journals Catalytic Oxidation of Methylene Blue by Use of Natural Zeolite-Based Silver and Magnetite Nanocomposites

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 471 ◽  
Author(s):  
Aldiyar Kuntubek ◽  
Nurassyl Kinayat ◽  
Kulyash Meiramkulova ◽  
Stavros G. Poulopoulos ◽  
Joseph C. Bear ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Catalytic Oxidation ◽  
Natural Zeolite ◽  
Reaction Rate ◽  
Silver Oxide ◽  
Reaction Order ◽  
Physical Adsorption ◽  
Metallic Silver ◽  
H2o2 Concentration ◽  
20 Nm

This work reports the synthesis of natural zeolite-based silver and magnetite nanocomposites and their application for the catalytic oxidation of methylene blue in water. The zeolite was impregnated with 5.5 wt.% Fe in the form of magnetite nanoparticles with size of 32 nm, and with 6.4 wt.% Ag in the form of silver oxide and metallic silver nanoparticles with sizes of 42 and 20 nm, respectively. The results showed that physical adsorption contributed to the removal of methylene blue by 25–36% and that Fe3O4@NZU is superior to Ag2O@NZU and Ag0@NZU, leading to 55% removal without oxidant and 97% in the presence of H2O2. However, there is no evidence of significant mineralization of methylene blue. The application of reaction rate models showed that the reaction order changes from zero to first and second order depending on the H2O2 concentration.

scholarly journals Align Ag Nanorods via Oxidation Reduction Growth Using RF-Sputtering

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Zhan-Shuo Hu ◽  
Fei-Yi Hung ◽  
Shoou-Jinn Chang ◽  
Wei-Kang Hsieh ◽  
Kuan-Jen Chen
Keyword(s):  
Silver Oxide ◽  
Rf Sputtering ◽  
Thermal Reduction ◽  
Metallic Silver ◽  
Nanorod Arrays ◽  
Silver Particles ◽  
Subsequent Growth ◽  
Lattice Match ◽  
Oxidation Reduction ◽  
The Individual

Silver nanorod arrays grew on the individual metallic silver particles after the thermal decomposition of the silver oxides. The formation of silver oxide came from the input of oxygen during sputtering. The subsequent growth of the Ag nanorods started from the single silver grain that originated from the decomposition caused by thermal reduction. This method for oxidation reduction growth used no catalysts and improved the interface effect for the lattice match. Photoluminescence of Ag nanorods was detected at 2.17 eV.

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