wald and E. K. Ralph, Accounts Chem. Res., 4, 107 (1971). ( 20) Note Added in Proof. Since the submission of our manuscript Grunwald and Fong's full report has appeared (E. Grunwald and D. W. Fong, J. Amer. Chem. Soc., 94, 7371 (1972)). The activation parameters of the rate constant, which they assign as ku, are AH* = 0.7 kcal mol-1 and 5* = -18 eu. The large differences between these values and those found by us for the ruthenium system seem to support our conclusion that kG (eq 14) is the ratelimiting step in the proton exchange reaction of Ru(NH3)5NH22 + .
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