فهرس المقالات Silica-bonded n-propyldiethylenetriamine sulfamic acid حرية الوصول المقاله صفحة الملخص نص كامل 1 - 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
