3,5-Dimethylpyrazole is an

organic compound In chemistry, organic compounds are generally any chemical compounds that contain carbon-hydrogen or carbon-carbon bonds. Due to carbon's ability to catenate (form chains with other carbon atoms), millions of organic compounds are known. The ...

with the formula (CH₃C)₂CHN₂H. It is one of several isomeric derivatives of

pyrazole Pyrazole is an organic compound with the formula C3H3N2H. It is a heterocycle characterized by a 5-membered ring of three carbon Carbon () is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent ...

that contain two methyl substituents. The compound is unsymmetrical but the corresponding conjugate acid (pyrazolium) and conjugate base (pyrazolide) have C_2v 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 A coordination complex consists of a central atom or ion, which is usually metallic and is called the ''coordination centre'', and a surrounding array of bound molecules or ions, that are in turn known as ''ligands'' or complexing agents. Many ...

including trispyrazolylborate, a trispyrazolylmethane, and a pyrazolyldiphosphine. Condensation of

acetylacetone Acetylacetone is an organic compound with the chemical formula . It is a colorless liquid, classified as a 1,3-diketone. It exists in equilibrium with a tautomer . These tautomers interconvert so rapidly under most conditions that they are tre ...

and

hydrazine Hydrazine is an inorganic compound with the chemical formula . It is a simple pnictogen hydride, and is a colourless flammable liquid with an ammonia-like odour. Hydrazine is highly toxic unless handled in solution as, for example, hydrazine ...

gives 3,5-dimethylpyrazole: :CH₃C(O)CH₂C(O)CH₃ + N₂H₄ → (CH₃C)₂CHN₂H + 2 H₂O It has found use as a blocking agent for isocyanates.

References

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