Understanding the precise chemical identity of an intermediate is paramount for its successful application in synthesis and research. 1-Methyl-4-pyrazolecarboxylic Acid (CAS: 5952-92-1) is a heterocyclic compound whose detailed properties and specifications are critical for chemists and material scientists. This white to pale yellow powder or crystalline powder offers a unique combination of structural features and reactivity, making it a valuable asset in various scientific disciplines.

From a structural perspective, 1-Methyl-4-pyrazolecarboxylic Acid possesses a five-membered pyrazole ring, characterized by two adjacent nitrogen atoms. A methyl group is attached to one nitrogen (N-1 position), and a carboxylic acid functional group is appended to the ring at the 4-position. This molecular architecture contributes to its distinct chemical behavior and physical characteristics. Its molecular formula is C₅H₆N₂O₂, and its molecular weight is 126.11 g/mol.

The physical properties are well-defined: it typically presents as a white to pale yellow powder or crystalline powder. Its melting point falls within the range of 203-208°C, indicating good thermal stability. The compound exhibits moderate solubility in water, a trait attributed to the polar carboxylic acid group capable of hydrogen bonding. Its predicted pKa value of approximately 3.88 categorizes it as a moderately weak acid. Spectroscopic data, including Nuclear Magnetic Resonance (NMR) and Infrared (IR) spectroscopy, provide definitive identification of its structure and purity, confirming the presence of characteristic signals for the pyrazole ring, methyl group, and carboxylic acid moiety.

In terms of chemical reactions, the carboxylic acid group is the primary site of reactivity, readily undergoing esterification and amidation. These transformations are fundamental to its use as an intermediate, particularly in the synthesis of fungicides and other specialty chemicals. The chemical synthesis of pyrazole derivatives often leverages these inherent reactivities to build more complex molecules.

NINGBO INNO PHARMCHEM CO.,LTD. is committed to providing comprehensive product information to support our clients' research and manufacturing needs. We ensure that our 1-Methyl-4-pyrazolecarboxylic Acid meets stringent specifications for purity and quality. By offering detailed insights into the properties of heterocyclic building blocks, we empower scientists to confidently utilize this versatile compound in their groundbreaking work. The precise specifications of organic synthesis intermediates are key to achieving reproducible and successful outcomes in chemical innovation.