Document Type: Research Paper
Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I. R. Iran
Department of Chemistry, College of Science, Yazd University, Yazd, PO Box 89195-741, I. R. Iran
Two simple protocols for the synthesis of tetrahydrobenzo[a]xanthenes-11-ones using nano silica phosphoric acid are reported. Short reaction times, high yields, reusability of catalyst and easy workup are some advantages of these protocols.