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Brown, H.C.; Azzaro, M.E.; Koelling, J.G.; McDonald, G.J., Secondary Isotope Effects in the Reactions of Methyl-d3-pyridines with Boron Trifluoride. Consideration of the Secondary Isotope Effect as a Steric Phenomenon., J. Am. Chem. Soc., 1966, 88, 2520. [all data]