CO2 laser-induced decomposition of acetone, 2,3-butanedione and cyclobutanone sensitized by sulfur hexafluoride

1980 ◽  
Vol 45 (6) ◽  
pp. 1805-1811 ◽  
Author(s):  
Josef Pola ◽  
Josef Vítek ◽  
Milan Horák ◽  
Pavel Engst
Keyword(s):  
Acetic Acid ◽  
Reaction Mechanism ◽  
Partial Pressure ◽  
Decomposition Rate ◽  
Laser Power ◽  
Sulfur Hexafluoride ◽  
Buffer Gas ◽  
Sulphur Hexafluoride ◽  
Pyrolytic Products ◽  
Induced Decomposition

The CO2 cw laser powered homogeneous pyrolysis (LPHP) of acetone, 2,3-butanedione and cyclobutanone (all 1.3 - 4kPa) sensitized by sulphur hexafluoride (0.7-1.3kPa) was investigated. The decomposition course of the ketones is analogous to that occuring under conventional pyrolytic conditions. The decomposition rate and the product composition are affected by laser power, partial pressure of the sensitizer, and the buffer gas (helium) added. Besiedes the conventional pyrolytic products, the LPHP of acetone and 2,3-butanedione affords acetylene and that of cyclobutanone produces acetic acid. A possible reaction mechanism of the decompositions is discussed.

CO2 laser-induced decomposition of methyl iodide sensitized by sulfur hexafluoride

1980 ◽  
Vol 45 (7) ◽  
pp. 1910-1919 ◽  
Author(s):  
Klaus Dathe ◽  
Pavel Engst ◽  
Josef Pola ◽  
Milan Horák
Keyword(s):  
Methyl Iodide ◽  
Co2 Laser ◽  
Decomposition Rate ◽  
Sulfur Hexafluoride ◽  
Continuous Wave ◽  
Gaseous Mixtures ◽  
Exciting Photon ◽  
Irradiation Energy ◽  
Induced Decomposition

Gaseous mixtures of methyl iodide and sulfur hexafluoride yield upon irradiation by a continuous-wave CO2 laser iodine, methane, ethane, ethylene and acetylene - the products of methyl iodide decomposition. The decomposition rate and the mutual ratio of the products is dependent on the delivered irradiation energy, the methyl iodide/sulfur hexafluoride ratio and the energy of the exciting photon. Methyl iodide-d3 in the mixture with SF6 behaves similarly as methyl iodide yielding perdeuterated methane, ethane, ethylene, acetylene and iodine.

Theoretical study of the ketonization reaction mechanism of acetic acid over SiO2

2009 ◽  
Author(s):  
Mendel Fleisher ◽  
E. Lukevics ◽  
L. Leite ◽  
D. Jansone ◽  
K. Edolfa ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Reaction Mechanism ◽  
Theoretical Study

Radical Intermediates in Photochemical and Redox Initiated Decomposition of Thioazo Compounds(an EPR and Cyclovoltammetric Study)

1997 ◽  
Vol 62 (6) ◽  
pp. 855-865 ◽  
Author(s):  
Katarína Erentová ◽  
Vladimír Adamčík ◽  
Andrej Staško ◽  
Oskar Nuyken ◽  
Arming Lang ◽  
...  
Keyword(s):  
Decomposition Rate ◽  
Half Life ◽  
Spin Trap ◽  
Solvent Molecule ◽  
Life Time ◽  
Radical Intermediates ◽  
Reactive Radicals ◽  
Induced Decomposition

The cathodically and photochemically induced decomposition of thioazo compounds XC6H4-N2-S-C6H4CH3 and their polymers with X = NO2, COOH, and SO3H were investigated. The formation of carbon-centered XC6H4. and sulfur-centered .S-C6H4Y radicals was confirmed using spin-trap technique. These reactive radicals either abstract hydrogen from CH3CN solvent molecule forming .CH2CN radical or they recombine to cage products XC6H4-S-C6H4CH3 eliminating N2. The decomposition rate of the investigated thioazo compounds is characterized by a formal half-life time of 5 to 10 s.

scholarly journals Synthesis of spiro[dihydropyridine-oxindoles] via three-component reaction of arylamine, isatin and cyclopentane-1,3-dione

2013 ◽  
Vol 9 ◽  
pp. 8-14 ◽  
Author(s):  
Yan Sun ◽  
Jing Sun ◽  
Chao-Guo Yan
Keyword(s):  
Acetic Acid ◽  
Reaction Mechanism ◽  
Room Temperature ◽  
The Other ◽  
Other Hand ◽  
Three Component Reaction ◽  
High Yields

A fast and convenient protocol for the synthesis of novel spiro[dihydropyridine-oxindole] derivatives in satisfactory yields was developed by the three-component reactions of arylamine, isatin and cyclopentane-1,3-dione in acetic acid at room temperature. On the other hand the condensation of isatin with two equivalents of cyclopentane-1,3-dione gave 3,3-bis(2-hydroxy-5-oxo-cyclopent-1-enyl)oxindole in high yields. The reaction mechanism and substrate scope of this novel reaction is briefly discussed.

Reaction Mechanism of the Decomposition of Acetic Acid on Illuminated TiO2Powder Studied by Means ofin SituElectron Spin Resonance Measurements

Langmuir ◽  
1996 ◽  
Vol 12 (3) ◽  
pp. 736-738 ◽  
Author(s):  
Yoshio Nosaka ◽  
Katsuchika Koenuma ◽  
Kiminori Ushida ◽  
Akira Kira
Keyword(s):  
Acetic Acid ◽  
Reaction Mechanism ◽  
Spin Resonance

N-Aminopyrimidines: The Isomerization of 1-Aminobarbituric Acids to 2-(5-Oxo-4,5-dihydro-1H-1,2,4-triazol-3-yl) Aliphatic Acids

1979 ◽  
Vol 32 (1) ◽  
pp. 161 ◽  
Author(s):  
NW Jacobsen ◽  
BL McCarthy ◽  
S Smith
Keyword(s):  
Acetic Acid ◽  
Reaction Mechanism ◽  
Isomerization Reaction ◽  
Aliphatic Acids ◽  
Aqueous Acid

1-Aminobarbituric acid undergoes a facile isomerization in aqueous acid to 2-(5-oxo-4,5-dihydro-lH-l,2,4-triazol-3-yl)acetic acid which in turn can be decarboxylated to give 3-methyl-1H-1,2,4- triazol-5(4H)-one. The isomerization reaction is shown to be a general one, adaptable to the synthesis of oxotriazolyl aliphatic acids and their decarboxylated products. A reaction mechanism for the isomerization is proposed.

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