HYDROGEN GENERATION BY CO-60 GAMMA RADIOLYSIS OF WATER IN THE PRESENCE OF THE ZIRCALOY-4 OXIDATION PRODUCTS CRUSHED INTO DIFFERENT SIZES

SummaryThe anticoagulant activity of 3.3’-(benzylidene)-bis-4-hydroxycoumarin derivatives has been estimated by one step Quick’s method. The derivatives contained the following groups in the para position of benzylidene residue: NCS- (I), CH3-S- (II), CH3-SO-(III), CH3-S02- (IV), C2H5-S- (V), C2H5-SO- (VI), C2H5-S02- (VII). All these compounds were much more active than 3.3’-(benzylidene)-bis-4-hydroxycoumarin itself.Compounds possessing the ethyl chain at the sulphur atom (V, VI, VII) were more active than methyl homologues (II, III, IV). Comparison of the activity of the series of thio-, sulphoxy-, and sulphonyl-derivatives showed that among methyl- and ethyl-derivatives those with the sulphoxy grouping (III, VI) displayed the greatest anticoagulant activity. The action of sulphonyl (IV, VII) and thio-derivatives (II, V) was weaker and shortest. The derivative with the NCS-group (I) possessed a relatively the lowest activity among the investigated compounds. 3.3’-(p-Ethylsulphoxybenzyl-idene)-bis-4-hydroxycoumarin (VI), with distinct biological activity reached about ½ of dicoumarol activity.

Download Full-text

‘Unexpected’ aldehydes in the oxidation products of octadecenoates

Journal of Biochemical Toxicology ◽

10.1002/jbt.2570150601 ◽

1965 ◽

Vol 15 (6) ◽

pp. 237-243

Author(s):

M. M. Horikx

Keyword(s):

Oxidation Products

Download Full-text

SYSTEM OF STORAGE AND HYDROGEN GENERATION FOR POWER PROPULSION SYSTEMS AND CARS

Alternative Energy and Ecology (ISJAEE) ◽

10.15518/isjaee.2016.13-14.046-055 ◽

2016 ◽

pp. 46-55

Author(s):

P. G. Kudryavtsev ◽

O. L. Figovsky

Keyword(s):

Hydrogen Generation ◽

Propulsion Systems

Download Full-text

HYDROGEN FUELING STATION USING HYDROGEN GENERATION BY ALUMINUM POWDER HYDROTHERMAL OXIDATION

Alternative Energy and Ecology (ISJAEE) ◽

10.15518/isjaee.2017.10-12.075-085 ◽

2017 ◽

pp. 75-85 ◽

Cited By ~ 2

Author(s):

A. L. Dmitriev ◽

V. K. Ikonnikov

Keyword(s):

Aluminum Powder ◽

Hydrogen Generation ◽

Hydrothermal Oxidation ◽

Fueling Station

Download Full-text

Mechanistic Insights into Fe Catalyzed α-C-H Oxidations of Tertiary Amines

10.26434/chemrxiv.9101405 ◽

2019 ◽

Author(s):

Christopher J. Legacy ◽

Frederick T. Greenaway ◽

Marion Emmert

Keyword(s):

Free Radical ◽

Catalytic Mechanism ◽

Catalyst System ◽

Oxidation Products ◽

Tertiary Amines ◽

Catalyst Activation ◽

Rate Determining Step ◽

Fe Catalyst ◽

Ligand Coordination ◽

Rate Kinetics

We report detailed mechanistic investigations of an iron-based catalyst system, which allows the α-C-H oxidation of a wide variety of amines, including acyclic tertiary aliphatic amines, to afford dealkylated or amide products. In contrast to other catalysts that affect α-C-H oxidations of tertiary amines, the system under investigation employs exclusively peroxy esters as oxidants. More common oxidants (e.g. tBuOOH) previously reported to affect amine oxidations via free radical pathways do not provide amine α-C-H oxidation products in combination with the herein described catalyst system. Motivated by this difference in reactivity to more common free radical systems, the investigations described herein employ initial rate kinetics, kinetic profiling, Eyring studies, kinetic isotope effect studies, Hammett studies, ligand coordination studies, and EPR studies to shed light on the Fe catalyst system. The obtained data suggest that the catalytic mechanism proceeds through C-H abstraction at a coordinated substrate molecule. This rate-determining step occurs either at an Fe(IV) oxo pathway or a 2-electron pathway at a Fe(II) intermediate with bound oxidant. We further show via kinetic profiling and EPR studies that catalyst activation follows a radical pathway, which is initiated by hydrolysis of PhCO3 tBu to tBuOOH in the reaction mixture. Overall, the obtained mechanistic data support a non-classical, Fe catalyzed pathway that requires substrate binding, thus inducing selectivity for α-C-H functionalization.<br>

Download Full-text

Study on the Oxidation Products of Hemp Seed Oil and its Application in Cosmetics

Tenside Surfactants Detergents ◽

10.3139/113.110679 ◽

2020 ◽

Vol 57 (3) ◽

pp. 230-236 ◽

Cited By ~ 1

Author(s):

Yawei Huang ◽

Liujun Pei ◽

Xiaomin Gu ◽

Jiping Wang

Keyword(s):

Seed Oil ◽

Oxidation Products ◽

Hemp Seed

Download Full-text

Comparative TG/DTG/DTA+FTIR Studies Concerning the Stability of Some Mineral and Vegetable Electro-Insulating Fluids

Revista de Chimie ◽

10.37358/rc.18.9.6535 ◽

2018 ◽

Vol 69 (9) ◽

pp. 2366-2371

Author(s):

Andrei Cucos ◽

Petru Budrugeac ◽

Iosif Lingvay ◽

Adriana Mariana Bors ◽

Andreea Voina

Keyword(s):

Vegetable Oils ◽

Electrical Equipment ◽

Inert Atmosphere ◽

Oxidation Products ◽

Gaseous Products ◽

Mineral Oils ◽

Ftir Studies ◽

Dta Analysis ◽

Anti Oxidant ◽

The Stability

Thermal TG/DTG/DTA analysis coupled with FTIR spectroscopy was applied to some sorts of mineral and vegetable oils used in electrical equipment. On heating in inert atmosphere, it was observed that the mineral oils vaporize, while the vegetable oils undergo hydrolysis, yielding fatty acids as main volatiles, as indicated by FTIR. In synthetic air, the FTIR spectra of gaseous products confirm the presence of similar oxidation products, both for mineral and vegetable oils. The TG results indicated that the vegetable-based oils exhibit a substantially higher thermal stability than the mineral oils. The presence or absence of anti-oxidant inhibitors in these oils greatly influences the onset of the oxidation process in air environment factor, as results from the DTA results.

Download Full-text