Aryl-14-H-dibenzo[a,i]xanthenes were synthesized efficiently by one-pot reaction of ß-naphthol, aldehydes and 2-hydroxy-1,4-naphthoquinone in the presence of silica-bonded N-propyl sulfamic acid (SBNPSA)
at 120 oC without solvent. All products were characterized by 1H NMR, 13C NMR, MS techniques and elemental analysis.
Dibenzo[a,i]xanthenes, ß-Naphthol, 2-Hydroxy-1,4-naphthoquinone, Silica-bonded N-propyl sulfamic acid (SBNPSA), Solvent-free