A high-yield, open-vessel route for the facile-operational, gram-scale synthesis of
functionalized triarylmethanes (TRAMs) is described via silica-coated magnetic nanoparticles
of modified polyphosphoric acid (NiFe2O4@SiO2-PPA)-mediated intermolecular Friedel–Crafts reaction of substituted aryl aldehydes
with 2 equivalents of oxygenated arenes under environmentally friendly reaction conditions.
Among the overall reaction process, only water was generated as the by-product. Various
reaction conditions are investigated for efficient transformation.
Key words
gram-scale synthesis - triarylmethanes - magnetic nanoparticles - Friedel–Crafts
reaction - environmentally friendly