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In this research, magnetic Fe 3 O 4 -NP nanoparticles were synthesized employing a green biosynthetic procedure by reduction of ferric chloride solution with clover leaf water extract. The nanoparticles prepared via this biosynthesis method can potentially be valuable for different purposes such as organic synthesis. In this research, 1,3-benzoxazole derivatives were generated via a multicomponent reaction of α-bromo ketones, isothiocyanate, and propiolate in the presence of a catalytic amount of bio-Fe 3 O 4 MNPs and sodium hydride in water at 50 C in good yields. The catalyst was reused five times with a minor decrease in its catalytic activity. K E Y W O R D S 1,3-benzoxazole, alkyl (aryl) isothiocyanates, clover leaf, Fe 3 O 4 MNPs, isothiocyanates

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