A Facile, Simple and Convenient Method for the Synthesis of 14-Alkyl or Aryl-14-H-Dibenzo[a,j]xanthenes Catalyzed by pTSA in Solution and Solvent-Free Conditions - Khosropour, Ahmad Reza; Khodaei, Mohammad Mehdi; Moghannian, Hassan (Synlett, 2005)