scholarly journals Epoxidation of propylene by hydrogen peroxide catalyzed by the silanol‐functionalized polyoxometalates‐supported ferrate: Electronic structure, bonding feature, and reaction mechanism

2020 ◽  
Author(s):  
Yun‐Jie Chu ◽  
Gang Sun ◽  
Chun‐Hua Yang ◽  
Xue‐Mei Chen ◽  
Chun‐Guang Liu
Keyword(s):  
Hydrogen Peroxide ◽  
Electronic Structure ◽  
Reaction Mechanism ◽  
Epoxidation Of Propylene

Oxidation of ethylenediphosphinetetraacetate anions

1983 ◽  
Vol 48 (9) ◽  
pp. 2604-2608
Author(s):  
Jana Podlahová ◽  
Jaroslav Podlaha
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Electronic Structure ◽  
Acid Solutions ◽  
Tetraacetic Acid ◽  
Single Product ◽  
Weakly Acid ◽  
Inhibiting Effect ◽  
Oxidation By Molecular Oxygen ◽  
Protonated Forms

The oxidation of the ethylenediphosphinetetraacetate anion and its protonated forms by iodine, periodate, hydrogen peroxide, and oxygen has been studied in aqueous solution. The oxidation by the first three reagents is fast and yields a single product, bis(phosphine oxide), which has been isolated and characterized as ethylenebis(phosphinyl)tetraacetic acid. The oxidation by molecular oxygen proceeds considerably more slowly; in weakly acid solutions its rate is determined by the properties of the oxygen rather than by the electronic structure of the various protonated substrate species. The inhibiting effect of the phosphonium structures takes place only in strongly acid solutions.

Kinetics Studies for Catalytic Oxidation of Methyl Orange over the Heterogeneous Fe/Beta Catalysts

2013 ◽  
Vol 807-809 ◽  
pp. 361-364
Author(s):  
Fang Guo ◽  
Jun Qiang Xu ◽  
Jun Li
Keyword(s):  
Activation Energy ◽  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Methyl Orange ◽  
Incipient Wetness Impregnation ◽  
Kinetics Studies ◽  
Optimum Reaction ◽  
Catalyst Dosage ◽  
Oxidation Degradation ◽  
Degradation Of Methyl Orange

The Fe/Beta catalysts were prepared by conventional incipient wetness impregnation. The catalysis oxidation degradation of methyl orange was carried out in catalyst and H2O2 process. The results indicated that the catalyst and hydrogen peroxide were more benefit to degradation of methyl orange. The reaction condition was optimized. The optimum reaction process was as follow: iron amount of catalyst was 1.25%, the catalyst dosage and H2O2 concentration was 1 mg/L and 1.5 mg/L, and reaction temperature was 70 °C. The apparent activation energy (65 KJ/mol) was obtained according to the arrhenius formula, which was benefit to study the reaction mechanism.

scholarly journals Study of Interaction between Tigecycline and Sulbactam

2019 ◽  
pp. 1-9
Author(s):  
Hakan Sezgin Sayiner ◽  
Fatma Genç ◽  
Fatma Kandemirli
Keyword(s):  
Electronic Structure ◽  
Reaction Mechanism ◽  
Peripheral Neuropathy ◽  
Drug Interactions ◽  
Reaction Mechanisms ◽  
Bond Formation ◽  
Therapeutic Drug ◽  
Energetic Condition ◽  
Biochemical Systems ◽  
Semi Empirical

Drug interactions can have desired, reduced or unwanted effects. The probability of interactions increases with the number of drugs taken. Side effects or therapeutic drug interactions can increase or decrease the effects of one or two drugs. Failure may result from clinically meaningful interactions. Clinicians rarely use foreseeable drug-drug interactions to produce the desired therapeutic effect. For example, when we consider two drugs each causing, peripheral neuropathy increases the likelihood of neuropathy occurrence. In this study geometry optimizations of tigecycline and sulbactam drugs and their combination have been carried out with the evaluation of B3LYP/6-311G (d, p), B3LYP/6-311G (2d, 2p) levels, and the reaction mechanism at semi empirical PM6, which was parameterized for biochemical systems and B3LYP/6-311G (d,p) levels. The main objective of the study is to understand the interaction ofsulbactam with tigecycline, to describe energetic condition of bond formation and electronic structure (orders of the broken and formed bonds). The reaction mechanisms of sulbactam with tigecycline have been studied as stepwise and concerted mechanisms using semi-empircal PM6 and B3LYP/6-311G (d,p) levels.

scholarly journals Reaction Mechanism of Aqueous Benzene with Hydrogen Peroxide by Transient Absorbance Spectra

2004 ◽  
Vol 20 (09) ◽  
pp. 1112-1117 ◽  
Author(s):  
Zhu Cheng-Zhu ◽  
◽  
Zhang Ren-Xi ◽  
Zheng Guang-Ming ◽  
Ouyang Bin ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Transient Absorbance ◽  
Absorbance Spectra

Reaction mechanism of 1,2-hydrogen migration of hydrogen peroxide

1990 ◽  
Vol 68 (5) ◽  
pp. 666-673 ◽  
Author(s):  
Enric Bosch ◽  
José M. Lluch ◽  
Juan Bertrán
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Water Molecule ◽  
Energy Barrier ◽  
Electron Distribution ◽  
Reaction Path ◽  
Bifunctional Catalyst ◽  
Reaction Coordinate ◽  
Intrinsic Reaction Coordinate ◽  
Hydrogen Migration

The 1,2-hydrogen migration of hydrogen peroxide has been investigated by abinitio methods and the Intrinsic Reaction Coordinate (IRC) has been constructed. An analysis of the evolution of the electron distribution along the reaction path has shown that the shifting hydrogen behaves as a proton. This transferring proton polarizes the O—O bond of the hydrogen peroxide that becomes broken at the transition state. If a water molecule is allowed to participate in the reaction, the energy barrier is noticeably lowered, this water molecule acting as a bifunctional catalyst. Keywords: 1,2-hydrogen migration, hydrogen peroxide, proton transfer, bifunctional catalyst, Intrinsic Reaction Coordinate.

scholarly journals Oxidative cleavage of cycloalkenes using hydrogen peroxide and a tungsten-based catalyst: towards a complete mechanistic investigation

2021 ◽  
Vol 45 (1) ◽  
pp. 235-242
Author(s):  
Tony Cousin ◽  
Gregory Chatel ◽  
Bruno Andrioletti ◽  
Micheline Draye
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Oxidative Cleavage ◽  
Mechanistic Investigation ◽  
By Products

The identification of intermediates and by-products issuing from the oxidative cleavage of cycloolefins allows proposing of a reaction mechanism.

scholarly journals Reaction Mechanism in Drug Analysis. III. : Reaction of 5-Allylbarbituric Acids with Hydrogen Peroxide and Hydrochloric Acid

1970 ◽  
Vol 90 (5) ◽  
pp. 532-536 ◽  
Author(s):  
KAZUO KIGASAWA ◽  
HIROAKI SHIMIZU ◽  
TAKEHIKO IWATA ◽  
HISAYOSHI TANAKA ◽  
HIDEHISA NAKAGURO ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Hydrochloric Acid ◽  
Drug Analysis
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