Nano-Silica Phosphoric Acid: An Efficient Catalyst for One-Pot Synthesis of Tetrahydrobenzo[a]xanthenes-11-one Under Solvent- Free or Sonication Conditions

Document Type : Research Paper


1 Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I. R. Iran

2 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.