Tungstophosphoric acid nanoparticles supported on polyamic acid: A mild and recoverable heterogeneous catalyst for the selective synthesis of mono and bulky bis(1,8-dioxooctahydroxanthene)s under solvent-free conditions

ABSTRACT A series of 1,8-dioxooctahydroxanthene derivatives and some crowded bis(1,8-dioxooctahdroxanthene) were selectively synthesized using tungstophosphoric acid nanoparticles supported on polyamic acid (TPA/PAA) as a new catalyst in solvent-free conditions. The high purity products were isolated and catalyst was easily separated in simple work-up and was recycled several times without loss of reactivity under the described reaction conditions. The reaction is characterized by short reaction time, high efficiency and environmentally friendly reaction conditions. GRAPHICAL ABSTRACT

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