THE LIQUID PHASE PHOTOLYSIS OF DIETHYL KETONE AND METHYL ETHYL KETONE

1958 ◽  
Vol 36 (2) ◽  
pp. 400-409 ◽  
Author(s):  
P. Ausloos
Keyword(s):  
Liquid Phase ◽  
Quantum Yield ◽  
Methyl Ethyl Ketone ◽  
Methyl Ethyl ◽  
Diethyl Ketone ◽  
Arrhenius Plots ◽  
Temperature Range ◽  
A Value ◽  
Recombination Reactions

The liquid phase photolysis of diethyl ketone has been studied in the temperature range from −35° to 95 °C. The CO quantum yield at 95 °C. was found to be close to unity. At 28 °C. decrease in intensity and addition of heptane led to a substantial increase of the CO and the ethane yields.The methyl ethyl ketone liquid phase photolysis at temperatures between 5° and 75 °C. led to the same observations. Arrhenius plots of RE/RB1/2[K] gave for both compounds a value of 5 kcal./mole.Gas phase studies in the temperature range of 0° to 60 °C. confirmed the low CO quantum yield reported previously and showed evidence for disproportionation and recombination reactions between ethyl and propionyl radicals.

Anticonvulsant effects of methyl ethyl ketone and diethyl ketone in several types of mouse seizure models

2010 ◽  
Vol 642 (1-3) ◽  
pp. 66-71 ◽  
Author(s):  
Nobuyoshi Hasebe ◽  
Kohji Abe ◽  
Eriko Sugiyama ◽  
Rie Hosoi ◽  
Osamu Inoue
Keyword(s):  
Methyl Ethyl Ketone ◽  
Methyl Ethyl ◽  
Diethyl Ketone ◽  
Seizure Models ◽  
Anticonvulsant Effects

THE PHOTOLYSIS OF KETENE IN THE PRESENCE OF HYDROGEN

1956 ◽  
Vol 34 (2) ◽  
pp. 113-122 ◽  
Author(s):  
H. Gesser ◽  
E. W. R. Steacie
Keyword(s):  
Methyl Ethyl Ketone ◽  
Methyl Ethyl ◽  
Chain Reaction ◽  
Temperature Range ◽  
A Chain ◽  
Good Agreement

The photolysis of ketene in the presence of hydrogen has been investigated in the temperature range −40° to 207 °C. The main products are CO, C2H4, C2H6, and CH4, with some methyl ethyl ketone at the higher temperatures. Hydrogen and ketene compete for CH2 radicals by the reactions[Formula: see text]with E3 − E2 = 0.8 kcal. At the higher temperatures the reaction[Formula: see text]leads to a chain reaction via[Formula: see text]The value of E6 is found to be 10.2 ± 0.5 kcal. in good agreement with previous work.

Vapor-Liquid Equilibria of Methanol-Methyl Ethyl Ketone in the Presence of Diethyl Ketone.

1966 ◽  
Vol 11 (3) ◽  
pp. 331-333 ◽  
Author(s):  
W. J. Privott ◽  
D. R. Paul ◽  
K. R. Jolls ◽  
E. M. Schoenborn
Keyword(s):  
Methyl Ethyl Ketone ◽  
Methyl Ethyl ◽  
Diethyl Ketone ◽  
Vapor Liquid Equilibria ◽  
Vapor Liquid

The photolysis of tetrahydrofuran and of some of its methyl derivatives at 185 nm

1980 ◽  
Vol 58 (24) ◽  
pp. 2819-2826 ◽  
Author(s):  
Nuray Klzilkilic ◽  
Heinz-Peter Schuchmann ◽  
Clemens von Sonntag
Keyword(s):  
Liquid Phase ◽  
Quantum Yield ◽  
Gas Phase ◽  
Carbonyl Compounds ◽  
Quantum Yields ◽  
Product Analysis ◽  
A Value ◽  
Steric Factors ◽  
Methyl Derivatives ◽  
Group 1

The uv photolysis of tetrahydrofuran, 1, 2-methyltetrahydrofuran, 2, cis-2,5-dimethyltetrahydrofuran, 3, trans-2,5-dimethyltetrahydrofuran, 4, and 2,2,5,5-tetramethyltetrahydrofuran, 5, has been investigated by product analysis in the liquid phase, and quantum yields have been determined. The photolysis of tetrahydrofuran itself was also studied in the gas phase at pressures ranging from 1 to 120 atm (pressurizing gas N2); and very little difference was found between the photolytic behaviour of the vapour at 120 atm and that of the liquid. The major products are in ail cases the cyclopropanes and the corresponding carbonyl compounds, as well as the olefinic alcohols and the carbonyl compounds that are isomeric with the starting material. These products are considered to be formed by the two major primary processes [i] and [ii].[Formula: see text]The cyclopropanes formed in reaction [i] retain some excess energy (apparently more than is needed to realize the trimethylene form), and in the photolysis of tetrahydrofuran vapour the hot cyclopropane rearranges to a considerable extent into propene. The propene to cyclopropane yield ratio falls strongly with increasing pressure, to a value of 0.065 at 120 atm. A similar value is observed in the liquid phase photolysis.The five-membered oxyl alkyl diradical from reaction [ii] is the likely intermediate in the cis-trans photoisomerization that is observable with the 2,5-dimethyltetrahydrofurans [Formula: see text]. The photolysis of these compounds also demonstrates that steric factors have a strong bearing on the course of the reaction, e.g. the quantum yield of methylcyclopropane from the cis compound is 0.22, vs. 0.08 from the trans compound.Molecular hydrogen is produced if the tetrahydrofurans carry hydrogen in α-position. Its production is enhanced if the α-position is shared with a methyl group (1 gives a hydrogen quantum yield of 0.07, 2 of 0.17, 3 of 0.27, 4 of 0.29, and 5 of zero).

PHOTOLYSIS OF 2, 2′, 4, 4′-TETRADEUTERODIETHYL KETONE

1951 ◽  
Vol 29 (12) ◽  
pp. 1092-1103 ◽  
Author(s):  
M. H. J. Wijnen ◽  
E. W. R. Steacie
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Diethyl Ketone ◽  
Temperature Range ◽  
A Value ◽  
Ethyl Radicals

The photolysis of CH3CD2COCD2CH3 has been studied over a temperature range from 25°C. to 365°C. The results confirm several features of the mechanism, previously proposed for the photolysis of diethyl ketone. It is concluded that disproportionation of ethyl radicals occurs by a "head to tail" mechanism. As activation energy for the reaction[Formula: see text]a value E4 = 8.7 kcal. was found. As activation energy for Reaction (5)[Formula: see text]a value of E5 = 11.7 kcal. was found. An activation energy of ∼ 17 kcal. is estimated for the thermal decomposition of the pentanonyl radical

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