NUCLEAR MAGNETIC RESONANCE MEASUREMENTS OF PROTON EXCHANGE IN ALCOHOL–WATER SYSTEMS: PART III. n-, i-, s-, AND t-C4H9OH–H2O

Measurements of exchange-broadened n.m.r. signals are analyzed by recent methods to yield proton exchange rates of the reaction [Formula: see text] where R = n-, i-, s-, and t-C4H9. The rate constants suggested are 0.95 (44°), 0.90 (42°), 0.60 (46°), and 0.25 (46°) l. mole−1 sec −1, respectively. The trend in rate constants for these four systems, and the C2H5OH–, n-C3H7OH–, and i-C3H7OH–H2O systems examined in Parts I and II (W. G. Paterson, Can. J. Chem. 41, 714, 2472 (1963)), is discussed in terms of the nature of the alkyl groups in each alcohol.