S. Kobayashi, M. Moriwaki, I. Hachiya
Mar 18, 1996
Citations
0
Influential Citations
42
Citations
Journal
Tetrahedron Letters
Abstract
Abstract Hafnium trifluoromethanesulfonate (hafnium triflate, Hf(OTf) 4 ) was found to be an efficient catalyst in the Fries rearrangement of acyloxy benzene or naphthalene derivatives. The reactions proceeded smoothly in the presence of 5–20 mol% Hf(OTf) 4 . Regioselective direct acylation of phenol and naphthol derivatives with acid chlorides was also achieved by using Hf(OTf) 4 as a catalyst.