Reactions of Ethylene with Rhodium (III) Chloride. Part IV. Relative Activity of Tetra-, Penta-, and Hexa-chlororhodate(III) Complexes for the Oxidation of Ethylene to Acetaldehyde in Aqueous Acid Solutions

1972 ◽  
Vol 50 (11) ◽  
pp. 1708-1712 ◽  
Author(s):  
B. R. James ◽  
M. Kastner
Keyword(s):  
Catalytic Oxidation ◽  
Relative Activity ◽  
Acid Solutions ◽  
Chloride Complexes ◽  
Chloro Complexes ◽  
Mild Conditions ◽  
Aqueous Acid ◽  
Coordinated Water

The catalytic oxidation of ethylene to acetaldehyde using the rhodium(III) chloride complexes, [Formula: see text] in the presence of iron(III) has been studied kinetically in aqueous acid solutions under mild conditions.[Formula: see text] is inactive due to the absence of a coordinated water (hydroxide) ligand. Solutions containing tetrachloro species are generally more reactive than those containing pentachloro species because of the presence of a greater concentration of highly reactive hydroxy species. The neutral and cationic chloro-complexes are inactive due to their substitution inertness.

Reactions of Ethylene with Rhodium (III) Chloride. Part III. The Catalytic Oxidation of Ethylene to Acetaldehyde in Aqueous Hydrochloric Acid Solutions Containing Pentachloroaquorhodate(III)

1972 ◽  
Vol 50 (11) ◽  
pp. 1698-1707 ◽  
Author(s):  
B. R. James ◽  
M. Kastner
Keyword(s):  
Hydrochloric Acid ◽  
Acid Chloride ◽  
Rate Constants ◽  
Acid Solutions ◽  
Reaction Conditions ◽  
Gas Uptake ◽  
Mild Conditions ◽  
Aqueous Acid ◽  
Hydrochloric Acid Solutions ◽  
Kinetics Of

In the presence of iron(III) or other oxidants, aqueous acid chloride solutions of RhCl5(H2O)2− catalyze under mild conditions the oxidation of ethylene to acetaldehyde. The kinetics of the reaction measured by gas-uptake techniques indicate the presence of both ethylene dependent and independent paths. Besides fully protonated anions, hydroxy species such as RhCl5 (OH)3− and RhCl4(OH)(H2O)2−, although present in very small concentrations, are significantly reactive towards ethylene. A mechanism, based on that postulated for a similar palladium(II) system in the well-known Wacker process, is presented. Under our reaction conditions the slow steps in the rhodium system involve formation of π-complexes in the ethylene dependent paths and the formation of tetrachlororhodate(III) complexes in the ethylene independent paths. Iron(III) regenerates the rhodium(III) catalyst by oxidation of the rhodium(I). Rate constants are estimated for the various reaction paths.

Oxidation of 2-methylpyrroles with perchlorinated iron(III) metalloporphyrin catalysts: a versatile synthesis of symmetric and asymmetric dipyrromethanes

1998 ◽  
Vol 76 (10) ◽  
pp. 1467-1473 ◽  
Author(s):  
Veranja Karunaratne ◽  
David Dolphin
Keyword(s):  
Catalytic Oxidation ◽  
Allylic Alcohols ◽  
The Novel ◽  
Efficient Synthesis ◽  
Mild Conditions ◽  
Metalloporphyrin Catalysts

A variety of substituted 2-methylpyrroles (3-8) were oxidized using the metalloporphyrin catalysts iron(III) meso-tetra(2,6-dichloro-3-sulphonatophenyl)-β-octachloroporphyrin chloride 1 and iron(III) meso-tetra(2,6-dichlorophenyl)-β-octachloroporphyrin chloride 2 under very mild conditions. Treatment of the resulting allylic alcohols 3a-8a with α-free pyrroles 9 and 10 resulted in a very efficient synthesis of the corresponding dipyrromethanes 3b-8b and 3c-8c. Furthermore, the above allylic alcohols when treated with furfurylamine produced the novel (2-furylmethyl)-2-pyrrolylmethylamines 3d-8d.Key words: catalytic oxidation, metalloporphyrins, pyrroles, dipyrromethanes, polyhalogenated porphyrins.

Heterogeneous catalytic oxidation of neptunium(IV) in nitric acid solutions

2003 ◽  
Vol 91 (9) ◽  
Author(s):  
A. V. Ananiev ◽  
V.P. Shilov ◽  
Ph. Moisy ◽  
Charles Madic
Keyword(s):  
Nitric Acid ◽  
Catalytic Oxidation ◽  
Acid Solutions ◽  
Heterogeneous Catalytic ◽  
Nitric Acid Solutions

SummaryNeptunium(IV), being quite stable in 0.5–3M HNO

scholarly journals The Chemoselective Reduction of Isoxazolineγ-Lactams Through Iminium Aza-Diels-Alder Reactions: A Short-Cut Synthesis of Aminols as Valuable Intermediates towards Nucleoside Derivatives

2012 ◽  
Vol 2012 ◽  
pp. 1-10
Author(s):  
Misal Giuseppe Memeo ◽  
Mariella Mella ◽  
Paolo Quadrelli
Keyword(s):  
Catalytic Oxidation ◽  
Ring Opening ◽  
Diels Alder ◽  
Mild Conditions ◽  
Nucleoside Synthesis ◽  
Conformationally Locked

Isoxazolineγ-lactams are prepared starting from the regioisomeric cycloadducts of benzonitrile oxide to theN-alkyl 2-azanorbornenes taking advantage of the efficient catalytic oxidation by RuO4. The reduction of the amide groups is easily conducted in the presence of LiAlH4under mild conditions, which allowed for the chemoselective reduction of the amide moiety followed by ring opening to afford the desired conformationally locked isoxazoline-carbocyclic aminols, as valuable intermediates for nucleoside synthesis.

scholarly journals Voltammetric oxidation of dipyridamole in aqueous acid solutions

2000 ◽  
Vol 11 (2) ◽  
pp. 148-153 ◽  
Author(s):  
Marilza Castilho ◽  
Luiz E. Almeida ◽  
Marcel Tabak ◽  
Luiz H. Mazo
Keyword(s):  
Acid Solutions ◽  
Aqueous Acid

Catalytic Oxidation of Alcohols with Polymer-Supported Ruthenium Complex under Mild Conditions.

ChemInform ◽  
2006 ◽  
Vol 37 (15) ◽  
Author(s):  
Qiao-xiang Kang ◽  
Ju-jie Luo ◽  
Yan-bin Bai ◽  
Zhi-wang Yang ◽  
Zi-qiang Lei
Keyword(s):  
Catalytic Oxidation ◽  
Ruthenium Complex ◽  
Mild Conditions ◽  
Oxidation Of Alcohols ◽  
Polymer Supported

Extraction combined catalytic oxidation desulfurization of petcoke in ionic liquid under mild conditions

Fuel ◽  
2020 ◽  
Vol 260 ◽  
pp. 116200 ◽  
Author(s):  
Hui Liu ◽  
Huanhuan Xu ◽  
Mingqing Hua ◽  
LinLin Chen ◽  
Yanchen Wei ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Catalytic Oxidation ◽  
Mild Conditions
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