The periodate-glycol reaction. 5. Complex formation and kinetic analyses of 1,2-propanediol and 1,2-butanediol

The reactions of periodate with 1,2-propanediol and 1,2-butanediol were inv estigated in detail. These reactions are similar to that of ethanediol in t hat there are extensive formations of a periodate-glycol complex, and the I O4- form of periodate appears to be the primary reactant. However, they dif fer at pH 5.4 in that a small induction period was noted and rate equations previously used with ethanediol were inapplicable. At pH 1.08, the reactio ns proceeded similarly to ethanediol without a noticeable induction period. All data were fitted using a finite difference simulation (FDS) technique, and rates of the complex's formation, dissociation, and conversion to prod ucts have been evaluated at three temperatures. When feasible, procedure. T he activation energies for product formation and the enthalpies of complex formation are similar to those of ethanediol.