Simultaneous sonication assistance for the synthesis of pyrroloacridinones and its efficient catalyst HBF4 supported on uniform spherical silica nanoparticles

• HBF4 incorporated spherical mesoporous silica nanoparticle catalyst synthesized.
• Ultrasound assisted synthesis of pyrrolo[2,3,4-kl]acridones.
• Immobilization of HBF4 on uniform spherical mesoporous silica nanoparticles not achieved before.
• Ethanol used as a green solvent.

Fluoroboric acid (HBF4) adsorbed on mesoporous silica nanoparticles of 600 nm dimension was synthesized and characterized by N2 adsorption, HRTEM, EDX, XPS. The applicability of silica-HBF4 was probed through the sonication assisted synthesis of pyrroloacridinones in ecofriendly solvent ethanol. Standard leaching experiment was performed to show that the reaction was heterogeneous with this recyclable catalyst.

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