𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Kinetic study of the gas-phase reaction c-C5H8 + I2 ⇄ c-C5H6 + 2HI the heat of formation and the stabilization energy of the cyclopentenyl radical

✍ Scribed by Shozo Furuyama; David M. Golden; Sidney W. Benson

Publisher
John Wiley and Sons
Year
1970
Tongue
English
Weight
276 KB
Volume
2
Category
Article
ISSN
0538-8066

No coin nor oath required. For personal study only.

✦ Synopsis

The gas-phase dehydrogenation of cyclopentene to cyclopentadiene catalyzed by iodine in. the range 178-283'C has been found to obey a rate law consistent with the slow rate-determining step, I + c-C5Hs --t HI + c-C5H, , log [ka/(l moleL1 sec-')I = 10.25 * 0.08 -(12.26 f 0.18)/0, where 0 = 2.303RT in kcal/mole. Surface effects are not important. This value of E, leads to a value of DHgge o/ = 82.3 f 1 kcal/mole and AH,,,,(o) = 38.4 f 1 kcal/mole. From difference in bond strengths in the alkane and the alkene, the allylic resonance stabilization in the cyclopentenyl radical is 12.6 f 1 .O kcal/mole, in excellent agreement with the value for the butenyl radical.

Arrhenius parameters for the other steps in the mechanism are evaluated. T h e low value of A, (compared with A, for cyclopentane) suggests a "tighter" transition state 4 "1 for H-atom abstraction from alkenes than from alkanes.

📜 SIMILAR VOLUMES

Kinetic study of the gas-phase reaction
Kinetic study of the gas-phase reaction c-C5H10 + I2 ⇄ c-C5H8 + 2HI the heat of formation of cyclopentyl radical
✍ Shozo Furuyama; David M. Golden; Sidney W. Benson 📂 Article 📅 1970 🏛 John Wiley and Sons 🌐 English ⚖ 389 KB

The kinetics of the gas-phase dehydrogenation of cyclopentane to cyclopentene is found to be consistent with a slow attack by a n I atom (step 4, text) on cyclopentane in the range 282-382OC. The measured rate constants fit the Xrrhenius equation, log k, = 11.95 f 0.08 -(24.9 f 0.23)/0 1 mole-l sec-

Theoretical and kinetic study of the H +
Theoretical and kinetic study of the H + C2H5CN reaction
✍ Jingyu Sun; Yizhen Tang; Hao Sun; Xiujuan Jia; Xiumei Pan; Rongshun Wang 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 374 KB 👁 2 views

## Abstract The reaction of H radical with C~2~H~5~CN has been studied using various quantum chemistry methods. The geometries were optimized at the B3LYP/6‐311+G(d,p) and B3LYP/6‐311++G(2d,2p) levels. The single‐point energies were calculated using G3 and BMC‐CCSD methods based on B3LYP/6‐311++G(2

The kinetics of the gas-phase reaction b
The kinetics of the gas-phase reaction between iodine and phenylsilane and the bond dissociation energy D(C6H5SiH2H)
✍ M. Barber; A. M. Doncaster; R. Walsh 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 418 KB

The title reaction has been investigated in the temperature range of 490-573 K. Initial reactant pressures were varied in the range of 0.2-5.2 torr (12) and 2-20 torr (C&,SiH3). The rate of iodine consumption, monitored spectrophotometrically, was found to obey both by initial rate and integrated e

The kinetics of the thermal gas-phase re
The kinetics of the thermal gas-phase reaction Br2 + C6F5I → BrI + C6F5Br. An attempt to determine the bond dissociation energy D(C6F5-I)
✍ Ernest N. Okafo; Eric Whittle 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 English ⚖ 372 KB

The kinetics of the thermal bromination reaction ( 3 ) have been studied in the range of 26lo-391"C. The observed rate law is compatible with initiation by the step (6) for which we obtain Brz + CsFsI -BrI + C6FsBr Br + C6FJ -BrI + C6F5 log k6(cm3/mol. sec) = (13.41 f 0.26) -(11700 f 700)/6 where 8