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A green synthesis of functionalized 4H‐chromenes using one‐pot, three‐component reaction of salicylaldehyde (1), active methylene (2), and carbon‐based nucleophile (3) using Fe3O4@CONa nanoparticles in water has been performed at 60°C. The Fe3O4@CONa nanoparticle as an efficient, green, and magnetically reusable heterogeneous catalyst was applied in these reactions up to the nine runs. Green catalyst...
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