Computational and matrix isolation studies of tetra-tert-butylethane

Bucher, G. (2009) Computational and matrix isolation studies of tetra-tert-butylethane. European Journal of Organic Chemistry(25), pp. 4340-4345. (doi:10.1002/ejoc.200900378)

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Irradiation of cryogenic xenon matrices containing the sterically congested alkane tetra-tert-butylethane (1) with intense pulses from a KrF excimer laser (λexc) = 248 nm) have resulted in the formation of methane and isobutene as the major products. Larger fragments derived from 1, such as 2,2-dimethylbutane (10), were also detected, whereas no evidence was obtained for the formation of the elusive tetra-tert-butylethylene (2). The results suggest that biphotonic irradiation of xenon matrices containing tert-butylated precursor molecules may generally result in the efficient formation of isobutene and smaller alkanes. An analysis of the decomposition reactions of 1 by various computational methods revealed that commonly used DFT methods, such as B3LYP or BLYP, and MP2 theory do not provide a good description of the energetics of the decay reactions of the sterically overloaded alkane 1. The recently developed M05-2X method was the only method among those tested to yield an activation enthalpy for the cleavage of 1 in agreement with the experimental value.

Item Type:Articles
Keywords:Activation, alkanes, alkenes, CO, computer chemistry, decomposition, Density-functional theory, efficient, forces, Matrix isolation, Methane, molecule, molecules, spectroscopy, Strained molecules, Thermochemistry, thermolabile hydrocarbons, Xenon, Xenon matrix
Glasgow Author(s) Enlighten ID:Bucher, Dr Goetz
Authors: Bucher, G.
Subjects:Q Science > QD Chemistry
Q Science > QC Physics
College/School:College of Science and Engineering > School of Chemistry
Journal Name:European Journal of Organic Chemistry
Publisher:Wiley - V C H Verlag GmbH & Co. KGaA
ISSN (Online):1099-0690
Published Online:17 July 2009

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