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Catalytic use of benzene-1,3-disulfonic acid at an ordinary condition gets restricted due to its high hygroscopic and moisture sensitive nature. In the present study, a new catalytic material silica bonded bis(hydrogensulphato)benzene (SiO 2 -BHSB) was synthesized through a sequence of reactions, where the active catalytic part benzene-1,3-disulfonic acid was grafted on the surface of micro-sized silica by the chemical bonding. Structural features, purity, thermal stability, and acid strength of the synthesized SiO 2 -BHSB material were confirmed by the adequate analytical techniques such as FT-IR, solid-state CP-MAS  13 C-NMR, CP-MAS  29 Si-NMR, EDX, DTG, TGA, and volumetric studies. The synthesized material SiO 2 -BHSB was observed as an efficient and sustainable reaction promoter for a tandem reaction between 4-hydroxy-1-methyl-2(1 H )-quinolone, malononitrile, and structurally diverse aldehydes to offer pyrano[3,2- c ]quinolone scaffolds. An environmentally benign catalytic protocol in aqueous based solvent and at ordinary energy conditions was developed, wherein a tiny amount (3 mol%) of SiO 2 -BHSB was observed sufficient to catalyze the synthesis pyrano[3,2- c ]quinolone scaffolds. Structures of the synthesized pyrano[3,2- c ]quinolone derivatives were established from their physical and spectrometric data. Catalyst recovery and reuse study revealed that SiO 2 -BHSB sustains its catalytic activity even after five runs of its reuse. Use of aqueous-based solvent, environmentally compatible reaction conditions, ease of catalyst recovery and reuse are the additional salient features of the present protocol.

polycyclic aromatic compounds

Silica Bonded Bis(Hydrogensulphato)Benzene as a New, Sustainable Catalytic Material for an Efficient and Aqueous Based Synthesis of 5-Oxo-4 H -Pyrano[3,2- c ]Quinolone Scaffolds