In this paper, hexamethylenetetramine-functionalized magnetic Fe 3 O 4 nanoparticles (Fe 3 O 4 @SiO 2 @Propyl-HMTA) catalyst was prepared and utilized for the synthesis of 4-aryl-NH-1,2,3triazole derivatives. Also, the interaction between aldehyde, nitromethane, and sodium azide was investigated within the synthesis route. Henry Reaction between the aldehyde and nitromethane created an intermediate that was immediately attacked by N 3 À . As a result of this attack, 4-aryl-NH-1,2,3triazole was generated through an in situ [3 + 2] cycloaddition.

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