✦ LIBER ✦

Gas-phase reactions of alkylperoxy and alkoxy radicals part I. The photoinitiated oxidation of 2,3-dimethylbutane

✍ Scribed by W.G. Alcock; B. Mile

Publisher: Elsevier Science
Year: 1977
Tongue: English
Weight: 800 KB
Volume: 29
Category: Article
ISSN: 0010-2180
DOI: 10.1016/0010-2180(77)90103-1

No coin nor oath required. For personal study only.

✦ Synopsis

A photoinitiation technique has been used to study the gas-phase reactions of specific alkylperoxy radicals derived from azomethane and 2,3-dimethylbutane. The rate of production of radicals is controlled and measured at temperatures (~100°C), where the number of reactions is reduced so as to permit a fuller and more quantitative analysis of the products than is usually possible in hydrocarbon oxidation studies. This increased control and fuller analysis limits the number of reaction rates that have to be considered and allows the overall mechanism to be proposed with more confidence. A numerical optimization technique and an approximate conventional kinetic analysis of the results have been used to test the mechanism and also to give estimates of the rate constants for four types of reaction:

(i) hydrogen abstraction reactions:

ii) nonterminating radical reactions: RO 2+ RO 2,k = 2.3 × 108tool -1 dm 3s -1 (iii) terminating reactions: RO 2 + RO 2 (R = CH 3 or C6H13), k = 2.4 x l08 tool -1 dm 3 s -1 i-C3H702 + RO 2, k = 6.2 x l08 mo1-1 dm 3 s -1 (iv) alkoxy oxidation reactions: RO + 02, k = 1.2 x l0 6 mo1-1 dm 3 s -1

📜 SIMILAR VOLUMES

Gas phase oxidation of alkenes—Part II.

Gas phase oxidation of alkenes—Part II. The oxidation of 2-methylbutene-2 and 2,3-dimethylbutene-2

✍ D.J.M. Ray; D.J. Waddington 📂 Article 📅 1973 🏛 Elsevier Science 🌐 English ⚖ 654 KB

The initial rate of oxidation of ttans-butene-2, 2-methylbutene-2, and 2,3dimethylbutene-2, increases with the number of methyl groups adjacent to the carbon-carbon double bond, suggesting that there is increasing facility of hydrogen atom abstraction from the methyl groups. On the other hand, the m

Pulse radiolysis study of reactions of a

Pulse radiolysis study of reactions of alkyl and alkylperoxy radicals originating from methyl tert-butyl ether in the gas phase

✍ Sarka Langer; Evert Ljungström; Thomas Ellermann; Ole J. Nielsen; Jens Sehested 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 602 KB

UV spectra and kinetics for the reactions of alkyl and alkylperoxy radicals from methyl tert-butyl ether (MTBE) were studied in 1 atm of SF, by the pulse radiolysis-UV absorption technique. UV spectra for the radical mixtures were quantified from 215 to 340 nm. At 240 nm, a, = (2.6 f 0.4) X lo-l8 cm

Kinetics of the gas-phase reactions of β

Kinetics of the gas-phase reactions of β-phellandrene with OH and NO3 radicals and O3 at 297 ± 2 K

✍ Basima Shorees; Roger Atkinson; Janet Arey 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 590 KB

Rate constants for the gas-phase reactions of the biogenically emitted monoterpene p-phellandrene with OH and NO3 radicals and O3 have been measured at 297 f 2 K and atmospheric pressure of air using relative rate methods. The rate constants obtained were (in cm3 molecule-' s-' units): for reaction

UV absorption spectrum of CH3OCH2 radica

UV absorption spectrum of CH3OCH2 radicals and kinetics of the reaction of CH3OCH2O2 radicals with NO and NO2 in the gas phase

✍ Sarka Langer; Evert Ljungström; Thomas Ellermann; Ole J. Nielsen; Jens Sehested 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 252 KB

Alkyl and alkylperoxy radicals originating from dimethyl ether have been studied in the gas phase at 296 K. A pulse radiolysis-UV absorption technique was used. Absorption cross-sections were quantified over the wavelength range 220-350 nm. At 230 nm, O'cH3oclJ2 = (4.2 + 0.5)× 10 -18 cm 2 molecule-l

Kinetics of the gas-phase reaction of CF

Kinetics of the gas-phase reaction of CF3CF2CH2OH with OH radicals and its atmospheric lifetime

✍ L. Chen; K. Fukuda; N. Takenaka; H. Bandow; Y. Maeda 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 79 KB 👁 2 views

CF 3 CF 2 CH 2 OH is a new chlorofluorocarbon (CFC) alternative. However, there are few data about its atmospheric fate. The kinetics of its atmospheric oxidation, the OH radical reaction of CF 3 CF 2 CH 2 OH, has been investigated in a 2-liter Pyrex reactor in the temperature range of 298 ϳ 356 K u

ChemInform Abstract: Chiral Ions in the

ChemInform Abstract: Chiral Ions in the Gas Phase. Part 3. Mechanisms and Stereochemistry of Acid-Induced Ring Opening of Optically Active 1,2-Propene Oxides in the Gas Phase.

✍ A. TROIANI; A. FILIPPI; M. SPERANZA 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 25 KB 👁 2 views