A study of salt effects and activation parameters indicates that the mechanism of bromination of thiophen in aqueous acetic acid is the same as that of benzene compounds. There is an isotope effect (kH/kD) of 1·3, which is shown to be secondary and does not represent slow proton loss.
A. R. Butler and J. B. Hendry, J. Chem. Soc. B, 1970, 170 DOI: 10.1039/J29700000170
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