investigation of synthesis and biologically active compounds of pyrazole derivatives containing transition metal, several newpyrazolecopper(II) complexes 3a−f were synthesized from pyrazole sodium salts 2a−f, which were produced from spiro‐pyrazoles 1a−f and sodium hydride by a ring‐opening reaction. All the synthesized compounds were characterized by spectroscopic analysis. Pyrazolecopper(II) complexes 3a−d