The Catalytic Fries Rearrangement and<i>o</i>-Acylation Reactions Using Group 3 and 4 Metal Triflates as Catalysts
作者:Shu Kobayashi、Mitsuhiro Moriwaki、Iwao Hachiya
DOI:10.1246/bcsj.70.267
日期:1997.1
Group 3 and 4 metal triflates (Sc(OTf)3, TiCl(OTf)3, Zr(OTf)4, and Hf(OTf)4) were found to be efficient catalysts in the Fries rearrangement of phenyl or 1-naphthyl acylates. It was also found that...
Metal triflates–methanesulfonic acid as new catalytic systems: application to the Fries rearrangement
作者:Omar Mouhtady、Hafida Gaspard-Iloughmane、Nicolas Roques、Christophe Le Roux
DOI:10.1016/s0040-4039(03)01599-5
日期:2003.8
triflates (Mg, Ca, Sc, Cu, Zn, Y, Ln, Bi) and methanesulfonic acid, leading to active catalytic systems for the Fries rearrangement. In particular, the systems based on yttrium and copper(II) triflate proved to be very active and much cheaper than scandium triflate. The efficiency of these systems might result from the catalytic Lewis acid activation of Brønsted acids.