The synthetic green voice of tetrahydro-11H-benzo[a]xanthen-11-one derivatives by investigating the catalytic performance of the quadratic form of the organic–inorganic tetramethylammonium hexafluorosilicate [(CH3)4N]2SiF6 single-crystal under green conditions

[Display omitted] •[(CH3)4N]2SiF6 is a new heterogeneous ecological catalyst in single crystal hybrid form perovskite salt.•[(CH3)4N]2SiF6 shows excellent catalytic activity for synthesis of tetrahydro-11H-benzo[a]xanthen-11-one derivatives.•[(CH3)4N]2SiF6 shows very high stability and durability for each reuse. The present study's purpose is to develop and improve a few reactions that are considered simple, more effective, cleaner, and less costly. In fact, a new (Inorganic-Organic) hybrid single-crystal tetramethylammonium hexafluorosilicate [(CH3)4N]2SiF6, as a heterogeneous ecological catalyst was used, which is found to be effective for the synthesis of tetrahydro-11H-benzo[a]xanthen-11-one via condensation of aromatic aldehydes, β-naphthols with dimedone in EtOH an reflux. The product synthesised were analysed and confirmed by melting point and different spectroscopic techniques FT-IR, 13C NMR, 1H NMR and Elemental Analysis. Furthermore, under ideal conditions of 3.44 mol% [(CH3)4N]2SiF6 and 2 ml EtOH as eco-solvent at reflux, these diverse compounds were produced in outstanding yields in very short durations. The tetramethylammonium hexafluorosilicate shows very high stability and durability for each reuse.