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Rates of Proton Abstraction from Conjugated Dienes in the Gas Phase

✍ Scribed by Felix K. Meyer; Mark J. Pellerite; John I. Brauman

Publisher
John Wiley and Sons
Year
1981
Tongue
German
Weight
301 KB
Volume
64
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The rates of proton transfer from 2, 4‐hexadiene, 1, 3‐cycloheptadiene, cyclopentadiene and acetone to t‐butoxide have been measured in the gas phase using pulsed‐ion‐cyclotron‐resonance spectroscopy. The rate constants are (units of 10^−10^ cm^3^ molecule^−1^ s^−1^): 2.7 ± 0.4, 3.8 ± 0.4, 6.1 ± 0.7 and 10.8 ± 1.5, respectively. These results are analyzed in terms of the properties of the encounter complex and reaction transition states. The reaction profile for t‐butoxide + cyclopentadiene is modeled using RRKM theory and an estimate for the central barrier height is obtained.

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