1-Chlorobenzotriazole assisted oxidative cleavage and kinetic study of vitamin B 1 in presence of homogeneous catalyst ruthenium Chloride: A mechanistic pathway

2017 ◽  
Vol 11-12 ◽  
pp. 119-130
Author(s):  
Prema Kadappa Reddy ◽  
Asha Iyengar
Keyword(s):  
Kinetic Study ◽  
Oxidative Cleavage ◽  
Homogeneous Catalyst ◽  
Vitamin B ◽  
Mechanistic Pathway ◽  
Ruthenium Chloride

KINETICS OF THE CUPRIC ACETATE CATALYZED HYDROGENATION OF DICHROMATE IN AQUEOUS SOLUTION

1955 ◽  
Vol 33 (2) ◽  
pp. 356-364 ◽  
Author(s):  
E. Peters ◽  
J. Halpern
Keyword(s):  
Activation Energy ◽  
Aqueous Solution ◽  
Partial Pressure ◽  
Kinetic Study ◽  
Reaction Rates ◽  
Homogeneous Catalyst ◽  
Cupric Acetate ◽  
Partial Pressures ◽  
Kinetics Of

In aqueous solution, cupric acetate was found to act as a homogeneous catalyst for the reduction of dichromate by hydrogen, i.e.[Formula: see text] The paper describes a kinetic study of this reaction. Rates were determined at temperatures between 80° and 140 °C. and hydrogen partial pressures up to 27 atmospheres. The rate is independent of the dichromate concentration but varies directly with the partial pressure of hydrogen and is nearly proportional to the concentration of cupric acetate. The activation energy is 24,600 calories per mole. Cupric acetate, apparently acting as a true catalyst, activates the hydrogen through formation of a complex with it. An extension of the mechanism proposed earlier for the reaction of cupric acetate itself with hydrogen also accounts for the kinetics of the dichromate reaction.

COMPLEX OF NICKEL (II) ION WITH TRYPTOPHAN AS A HOMOGENEOUS CATALYST IN THE DECOMPOSITION REACTION OF CUMENE HYDROPEROXIDE IN AQUEOUS SOLUTION

2021 ◽  
Vol 55 (2 (255)) ◽  
pp. 118-124
Author(s):  
Gevorg S. Grigoryan
Keyword(s):  
Aqueous Solution ◽  
Kinetic Study ◽  
Arrhenius Equation ◽  
Cumene Hydroperoxide ◽  
Effective Rate Constant ◽  
Catalytic Decomposition ◽  
Decomposition Reaction ◽  
Effective Rate ◽  
Homogeneous Catalyst ◽  
Kinetic Expression

The formation of Ni2+:Tryptophan (Trp) 1:1 complex, which acts as a model catalyst for decomposition of cumene hydroperoxide (ROOH) in Ni2++Trp+ROOH+H2O system, has been confirmed via kinetic study in aqueous solution at pH>7. The kinetic expression of a single catalytic decomposition reaction of ROOH under the influence of [NiTrp]+ complex was brought out. The temperature dependence of the effective rate constant of ROOH decay (Keff=Kcat[Ni2+]0[Trp]0=const) in the temperature range from 323 to 343 K can be expressed by Arrhenius equation (Eeff is in kJ/mol):  Keff=(1.87±0.02)·106exp[–(49.8±0.3)/RT], min –1.

scholarly journals Oxidative Cleavage ofβ-Keto Sulfones via Nitrous Acid

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Hatem A. Abdel-Aziz
Keyword(s):  
Carboxylic Acid ◽  
Formic Acid ◽  
Nitrous Acid ◽  
Oxidative Cleavage ◽  
Ring Cleavage ◽  
Cleavage Reaction ◽  
Chlorobenzoic Acid ◽  
Mechanistic Pathway ◽  
Naphthoic Acid

The reaction of nitrous acid with 1-aryl-2-(arylsulfonyl)ethanones3a–eafforded the unexpected arenecarboxylic acids12a–e, formic acid14, and benzene/4-toluenesulfinic acid15a,bthrough oxidative cleavage reaction. 4-Chlorobenzoic acid (12a), [1,1′-biphenyl]-4-carboxylic acid (12b), 2-naphthoic acid (12c), 2-thiophenecarboxylic acid (12d), and 2-benzofurancarboxylic acid (12e) were isolated in 72%, 62%, 55%, 58%, and 62% yields, respectively. The reported mechanistic pathways proposed the production of 1-aryl-2-(phenyl/tolylsulfonyl)ethane-1,2-dione7instead of arenecarboxylic acids12. A mechanistic pathway to explain the reaction of nitrous acid with 1-aryl-2-(arylsulfonyl)ethanones3a–ewas suggested. In this pathway, the intermediate 1,2-oxazete10lost benzene/4-toluenesulfinic acid15to produce 1,2-oxazet-3-one11. Ring cleavage of the latter intermediate afforded the arenecarboxylic acids12.

One-pot synthesis of tetrahydrobenzo[a]xanthen-11-one derivatives catalyzed by ruthenium chloride hydrate as a homogeneous catalyst

2011 ◽  
Vol 89 (6) ◽  
pp. 623-627 ◽  
Author(s):  
Khalil Tabatabaeian ◽  
Alireza Khorshidi ◽  
Manouchehr Mamaghani ◽  
Ali Dadashi ◽  
Milad Khoshnood Jalali
Keyword(s):  
Homogeneous Catalyst ◽  
Reaction Conditions ◽  
One Pot ◽  
One Pot Synthesis ◽  
Ruthenium Chloride ◽  
Chloride Hydrate

Three-component cyclocondensation of β-naphthol, aldehydes, and 5,5-dimethylcyclohexane-1,3-dione (dimedone) was catalyzed efficiently by ruthenium chloride hydrate under mild reaction conditions to afford 12-aryl or alkyl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one derivatives in good to excellent yields.

scholarly journals Pseudohomogeneous metallic catalyst based on tungstate-decorated amphiphilic carbon quantum dots for selective oxidative scission of alkenes to aldehyde

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aram Rezaei ◽  
Leila Hadian-Dehkordi ◽  
Hadi Samadian ◽  
Mehdi Jaymand ◽  
Homa Targhan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Phase Transfer ◽  
Carbon Quantum Dots ◽  
Oxidative Cleavage ◽  
Homogeneous Catalyst ◽  
Imidazolium Chloride ◽  
Phase Transfer Catalysts ◽  
One Step ◽  
Metallic Catalyst ◽  
Catalytic Cycles

AbstractHerein, we present an interesting role of tungstate-decorated amphiphilic carbon quantum dots (A-CQDs/W) in the selective oxidative cleavage of alkenes to aldehydes. In this work, for the first time, we disclose an unprecedented tungstate-based oxidative system incorporating A-CQDs as a bridge to the homogeneous catalyst for selective and efficient cleavage of a wide substrate scope of alkenes into aldehydes. The A-CQDs/W were synthesized via a one-step hydrothermal synthesis approach using 1-aminopropyl-3-methyl-imidazolium chloride and stearic acid for the surface modification, following by anion-exchange to immobilize WO4–2 to A-CQDs. The A-CQDs/W act as a pseudohomogeneous metallic catalyst (PMC) for selective oxidative scission of alkenes under phase transfer catalysts (PTC) free condition without over oxidation to acids, using water and H2O2 as a green oxidant. Thanks to the sub-nanometric size and novel engineered chemical structure, this PMC and reactants are in the same phase, besides they can be easily isolated from each other by extraction processes. The synthesized PMC exhibited excellent solubility and stability in various solvents. Interestingly, the system’s high conversion efficiency was preserved even after eight catalytic cycles indicating the recyclability of the synthesized PMC. We believe that this study provides a significant and conceptually novel advance in oxidative cleavage chemistry.

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