The gas-phase reaction of ozone with a series of unsaturated oxygenates and with 1-pentene has been studied at ambient T (287-296 K) and atm. of air. Reaction rate p ฯญ 1 constants, in units of cm 3 molecule ฯช1 s ฯช1 , are for 2 (5H)-furanone, ฯช18 10 0.22 ฯฎ 0.05 for methacrolein, for crotonaldehyde, f
Rate constants for the reactions of conjugated olefins with NO2 in the gas phase
โ Scribed by Tomohiro Ohta; Hiroaki Nagura; Shin Suzuki
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- English
- Weight
- 453 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0538-8066
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โฆ Synopsis
Gas-phase rate constants for the reaction of NOz with 16 conjugated olefins were determined a t room temperature by either conventional methods for bimolecular processes or by competitive reactions. It was found that the rate constants for conjugated olefins were larger than those for simple mono-olefins by factors of 103-104. Temperature dependence studies reveal that the difference in the rate constants for the two types of reactions can primarily be attributed to differences in their activation energies: kl,l.cyclohexad,ene = 5.8 x exp[ -(6.1 2 1 . 6 ) / R T ] cm3 molecule-' s-'; kc,s.2.butene = 4.68 x exp(-ll.P/RT) cm3 molecule-' s-l [23. A linear free energy relationship between the reactions of OH and NO2 with conjugated diolefins was observed.
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