Journal of Physical Chemistry p. 2341 - 2345 (1994)
Update date:2022-08-11
Topics:
Lifshitz, Assa
Laskin, Alexander
The isomerization of 2-methyl-4,5-dihydrofuran was studied behind reflected shock waves in a pressurized driver single-pulse shock tube over the temperature range 805-1030 K and densities of approximately ca 3*10-5 mol/cm3.Two isomerization products, acetylcyclopropane and 3-penten-2-one, are obtained in the isomerization.Acetylcyclopropane is formed in an irreversible process from 2-methyl-4,5-dihydrofuran.It further isomerizes, at higher temperatures, to cis- and trans-3-penten-2-one.At high temperatures where the conversion of 2-methyl-4,5-dihydrofuran is high, the main source for 3-penten-2-one is acetylcyclopropane.At lower temperatures 3-penten-2-one is formed mainly by a direct isomerization of 2-methyl-4,5-dihydrofuran.A small concentration of decomposition products, mainly methane and ethane, are also found in shock mixtures of 2-methyl-4,5-dihydrofuran, particularly at high temperatures.The Arrhenius relations for the tree aforementioned processes are as follows: 2-methyl-4,5-dihydrofuran -> acetylcyclopropane, k1=1015.4 exp(-56.8*103/RT) s-1; 2-methyl-4,5-dihydrofuran -> 3-penten 2-one, k2=1015.7 exp(-63.6*103/RT) s-1; acetylcyclopropane -> 3-penten-2-one, k3=1014.4 exp(-58.3*103/RT) s-1, where R is expressed in units of cal/(K mol).
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