Synthesis of Dibenzo[b,i]xanthene-5,7,12,14(13H)-tetraone using p-Toluenesulfonic Acid as Catalyst

Kittappa Gunasundari, Manickam Pramesh*,, Selvaraj Jayanthi, Moorthy Vetriselvan and Sreedharan Helen Perci

PG and Research Department of Chemistry, A.V.V.M. Sri Pushpam College, Poondi-613503, India

*Corresponding author: E-mail:


This methodology involves synthesis of dibenzo xanthene tetraone by one pot multicomponent reaction of 2-hydroxy-1,4-naphthoquinone and pyrazole aldehyde in presence of p-toluenesulfonic acid (PTSA) as catalyst in ethylene glycol at 75-95 ºC. This protocol provides excellent yields (80-90%) involving simple workup procedures and purification techniques. By using several spectroscopic techniques the compounds were characterized.


Xanthene, Pyrazole aldehydes, 2-Hydroxy-1,4-naphthoquinone, p-Toluenesulfonic acid.

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