3,5-Dimethylpyrazole is an organic compound with the formula (CH<sub>3</sub>C)<sub>2</sub>CHN<sub>2</sub>H. It is one of several isomeric derivatives of pyrazole that contain two methyl substituents. The compound is unsymmetrical but the corresponding conjugate acid (pyrazolium) and conjugate base (pyrazolide) have C<sub>2v</sub> symmetry. It is a white solid that dissolves well in polar organic solvents.
It is a precursor to a variety of ligands that are widely studied in coordination chemistry including trispyrazolylborate, a trispyrazolylmethane, and a pyrazolyldiphosphine.
Condensation of acetylacetone and hydrazine gives 3,5-dimethylpyrazole:
It has found use as a blocking agent for isocyanates.