Friedel-Crafts reactions induced by heteropoly acids. Regioselective adamantyl substitution of aromatic compounds

The influence of the preparation methods on the catalytic activity for CO oxidation was markedly large for Au-TiO₂ and negligible for Pt-TiO₂ catalysts. Platinum and gold were deposited on TiO₂ by deposition-precipitation (DP), photodeposition (FD) and impregnation (IMP). The DP method gave the most active catalysts for both Pt and Au. Gold catalysts prepared by DP were active at temperatures below 273 K and showed a much greater activity than Pt catalysts.