The kinetic isotope effect (kH/kD) for the hydrogen abstraction from (CH3)2CHOH and (CD3)2CDOH by hydrogen atoms in 6M-H2SO4 is 10·1 at 299°K, 18·1 at 253°K, and only 2·2 at 90°K, indicating that at 90°K the reaction is mainly diffusion controlled.
K. Vacek and C. von Sonntag, J. Chem. Soc. D, 1969, 1256 DOI: 10.1039/C29690001256
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