Funding information sayyed jamaleddin asdadabadi universityNano-Zn-[2-boromophenyl-salicylaldimine-methylpyranopyrazole]Cl 2 (nano-[Zn-2BSMP]Cl 2 ) as a nanoparticle Schiff base complex and a catalyst was introduced for the solvent-free synthesis of 4-((2-hydroxynaphthalen-1-yl)(aryl)methyl)-5-methyl-2-phenyl-1H-pyrazol-3(2H)-ones by the multicomponent condensation reaction of various aromatic aldehydes, β-naphthol, ethyl acetoacetate, and phenyl hydrazine at room temperature. K E Y W O R D S 4-((2-hydroxynaphthalen-1-yl)(aryl)methyl)-5-methyl-2-phenyl-1H-pyrazol-3 (2H)-one, multicomponent reaction, nano-[Zn-2BSMP]Cl 2 , schiff base complex, solvent-free