Isomerisation of the title compound 3 to the ester 4 in deuteriochloroform is believed to occur via rearrangement of an intermediate β-trimethylsilyl substituted carbocation, with subsequent capture by the 2,4-dinitrobenzoate anion.
A. J. Green, Y. L. Kuan and J. M. White, J. Chem. Soc., Chem. Commun., 1994, 2023 DOI: 10.1039/C39940002023
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