List of Articles Sulfonic acid functionalized imidazolium salt (SAFIS) Open Access Article Abstract Page Full-Text 1 - Friedel–Crafts synthesis of triarylmethanes over 3-methyl-1-sulfonic acid imidazolium tetrachloroaluminate under solvent-free conditions Saeid Azimi Mohammad Ali Zolfigol Ahmad Reza Moosavi-Zare