The primary kinetic isotope effect (kH/kD) for proton transfer from protonated 1,8-bis(dimethylamino)-2,7-dimethoxynaphthalene to bases has a value of unity even for reactions for which the proton donor and acceptor have similar pK values, a condition which would have been expected to lead to a maximum isotope effect.
F. Hibbert and H. J. Robbins, J. Chem. Soc., Chem. Commun., 1980, 141 DOI: 10.1039/C39800000141
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