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Kinetic Isotope Effects upon the Hydrolysis of Pyridine Arylboranes' Robert Earl Davis2aand Robert E. Kenson2b Contribution from the Department of Chemistry, Purdue University, Lafayette, Indiana. Received August 22, 1966 Abstract: The deuterium kinetic isotope effect for the hydrolysis of a series of pyridine arylboranes was measured. The results indicate that both a normal (>1) primary and an inverse (1O.O) the isotope effect is less than one, while for u less than that of hydrogen (