Canadian Journal of Chemistry p. 2325 - 2331 (1982)
Update date:2022-08-17
Topics:
Sharma, D. K. Sen
Ikuta, S.
Kebarle, P.
The kinetics and eqilibria of the gas phase reaction <1> tert-C4H9+ + C6H6 = tert-C4H9C6H6+ were studied with a high ion source pressure pulsed electron beam mass spectrometer.Equilibria <1> could be observed in the temperature range 285-325 K, van't Hoff plots of the equilibrium constants led to ΔH10 = -22+/-2 kcal mol-1 and ΔS10 = -49+/-5 cal K-1 mol-1.The rate constants at 305 K were k1f = 1.5*10-28 molecules-2 cm6 s-1 and k1r = 2.9*10-19 molecules-1 cm3 s-1. tert-C4H9C6H6+ dissociates easily via <1r> not only because of the low dissociation energy (-ΔH10) but also because of the unusually favorable entropy (-ΔS10).The occurence of transalkylation reactions: tert-C4H9C6H6+ + alkylbenzene = tert-C4H9 alkylbenzene+ + benzene, was discovered in the present work.
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