At short times, reaction of but-1-ene with toluene-p-sulfonic acid in trifluoroacetic acid gives 2-butyl tosylate 1, 2-butyl trifluoroacetate 2 and but-2-ene 3 in ratios of (![[gt-or-equal]](https://www.rsc.org/images/entities/char_2a7e.gif)
) 2.3:1: () 0.41; thus internal return is the major pathway and elimination is important for the tight 2-butyl cation–tosylate anion pair.
D. Farcaşiu, J. Chem. Soc., Chem. Commun., 1994, 2611 DOI: 10.1039/C39940002611
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