✦ LIBER ✦

The kinetics of the gas-phase reaction between ozone and alkenes

✍ Scribed by Erina S. Toby; Sidney Toby; H. Edward O'Neal

Publisher: John Wiley and Sons
Year: 1976
Tongue: English
Weight: 460 KB
Volume: 8
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550080105

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✦ Synopsis

The rate law -d[O,]/dt = kl[A][OJ + k3[A][03]2/(k4 + kb[02]) has been found

to obrain for the reaction of ozone with allene and with 1,2-butadiene. We now find that this rate law also applies to the reaction of ozone with ethylene and presumably with all lower alkenes. This generalizes the inhibiting effect of oxygen and accounts for the simplified rate law found in the presence of excess oxygen. Oxygen itself is a product of the ozone-ethylene reaction, and we find that as [03]0 increases, the ( 0 2 formed)/(Os used) ratio approaches 1.5. Values of kl, k3/k4, and k3/kS for ethylene are compared with those for allene, 1,3-butadiene, and propene. A generalized mechanism is postulated for the reaction of ozone with alkenes involving a chain sequence that produces oxygen and which accounts for the observed rate law. A specific mechanism is postulated for the reaction of 0 3 with ethylene, and the thermochemistry of the chain sequence is examined in detail.

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