List of Articles Pechmann reaction Open Access Article Abstract Page Full-Text 1 - Synthesis of 4-(trifluoromethyl) coumarins using nano sulfated-titania as solid acid catalyst under solvent-free conditions Mona Hosseini-Sarvari Sepideh Najafvand-Derikvandi Open Access Article Abstract Page Full-Text 2 - Silica-bonded n-propyldiethylenetriamine sulfamic acid as a recyclable solid acid catalyst for the synthesis of coumarin and biscoumarin derivatives Khodabakhsh Niknam Seyed Ahmad Sajadi Roghayeh Hosseini Mojtaba Baghernejad