A recyclable and highly effective sulfated TiO2-P25 for the synthesis of quinoxaline and dipyridophenazine derivatives at room temperature

Sulfated TiO2-P25 has been prepared using H2SO4 and used for the synthesis of quinoxaline and dipyridophenazine derivatives. Sulfate loading by H2SO4 increases the Lewis acidity of TiO2-P25. This catalyst gives excellent yield with less reaction time and it is an inexpensive, easily recyclable catalyst for this reaction.