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The kinetic isotope effect of hydrogen in the sulfonation of benzene with sulfur trioxide in nitrobenzene as solvent has been determined at 25° in a competitive study as kH/kD = 1.35 ± 0.16; for nitromethane as solvent kH/kD = 1.25 ± 0.01. Small amounts of diphenylsulfone were obtained as by‐product in the sulfonation reactions. For the sulfonylation reaction in the two solvents the kinetic isotope effect was determined at 25° as kH/kD = 0.96 ± 0.04 and 0.94 ± 0.07 respectively.
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Cerfontain et al. (1965) studied this question.
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