The CeCl3·7H2O/NaI/SiO2 System as an Efficient Promoter for the Friedel-Crafts Reaction of Indoles to Nitroalkenes under Solvent-Free Conditions - Bartoli, Giuseppe; Di Antonio, Giustino; Giuli, Sandra; Marcantoni, Enrico; Marcolini, Mauro; Paoletti, Melissa (Synthesis, 2008)