Table 3. Ketalization of Various Ketones with Alcohol Catalyzed by 0.1 mol % Hydrochloric Acid^a.

^aUnless otherwise specified, a mixture of ketones 1 (2 mmol), CH(OCH₃)₃ (2.4 mmol) and 0.1 mol % hydrochloric acid in methanol was stirred at an ambient temperature for 12 h.

^bDetermined by GC analyses of the crude reaction mixture.

^cIsolated yield.

^d12 h.

^eFor 24 h.

^fFor 30 min.

^gAt 40 °C.

^hEthylene glycol was used as the solvent.

ⁱTHF was used as the solvent.