Furthermore, the product yields of carbonate 9a were determined (Figure ) with respect to the reaction times in CHCl3 and CDCl3 under the same reaction conditions as in Scheme 2. It is worth noting that a significant induction period was observed when the reaction was conducted in CDCl3. It has been reported that the difference in bond energies between Cl3C-H and Cl3C-D is 6.0 kcal mol -1 . These results indicate that hydrogen abstraction from Cl3CH is the rate-limiting step in this reaction. (red triangle). The reaction conditions: ethylene glycol 0.4 mmol (0.1 M), ClO2 • (0.5 equiv.), and pyridine (5 equiv.) at room temperature. The product yields were determined using 1 H NMR.