Four-centre and six-centre hydrogen rearrangements occur in the molecular ions of diethyl ketone and methyl o-toluate, respectively, and these processes are shown to have frequency factors in the region of 3 × 106 and 3 × 1010 sec.–1.
A. N. H. Yeo and D. H. Williams, J. Chem. Soc. D, 1969, 956 DOI: 10.1039/C29690000956
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