Tetrahedron Letters p. 409 - 412 (1995)
Update date:2022-08-16
Topics:
Hachiya, Iwao
Moriwaki, Mitsuhiro
Kobayashi, Shu
Catalytic Friedel-Crafts acylation reactions were performed by using hafnium trifluoromethanesulfonate (hafnium triflate, Hf(OTf)4) as a catalyst.The catalytic activity of the Lewis acid catalyst was much improved in lithium perchlorate-nitromethane (LiClO4-MeNO2) and the yield was up to 250,000percent based on the catalyst.Various substituted benzenes reacted with acid annhydrides in the presence of a catalytic amount of Hf(OTf)4 to give the corresponding aromatic ketones in high yields.
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