Benzoylation of Benzene and Substituted Benzenes Catalyzed by Superacid ZrO2:H2SO4.

摘要

Superacid ZrO2:H2SO4 showed high activity in Friedel-Crafts benzoylation of benzene and substituted benzenes such as chlorobenzene, toluene and 1,3,5-trimethylbenzene. Benzophenones in 90-100% yields were obtained with catalytic amount of superacid ZrO2:H2SO4. The calcination temperature greatly influenced the acid strength and activity of the superacid ZrO2:H2SO4. The superacid has both Lewis and Bronsted acid sites. The reversibility of Friedel-Crafts benzoylation and transacylation were observed over the superacid. The used superacid could be readily regenerated and showed identical benzoylation activity to toluene.