3-Methylpyridine, widely recognized as 3-picoline, is an organic compound with the CAS number 108-99-6. This molecule belongs to the pyridine family, characterized by a six-membered aromatic ring containing one nitrogen atom. Specifically, 3-methylpyridine features a methyl group attached to the third carbon atom of the pyridine ring, distinguishing it from its isomers, 2-methylpyridine (α-picoline) and 4-methylpyridine (γ-picoline). This structural characteristic, placing the methyl group in the meta position relative to the nitrogen atom, significantly influences its chemical reactivity and physical properties.

The chemical formula for 3-methylpyridine is C6H7N, and it has a molecular weight of approximately 93.13 g/mol. Its physical appearance, as noted in product specifications and by suppliers like NINGBO INNO PHARMCHEM CO.,LTD., is typically that of a clear, colorless to light yellow liquid. This state is consistent with its melting point being well below room temperature (around -19 °C) and its boiling point at approximately 144 °C. These properties make it convenient to handle and use in various laboratory and industrial settings. The assay commonly specified is 99%, indicating a high level of purity essential for its use as a chemical intermediate.

The presence of the nitrogen atom in the pyridine ring makes 3-methylpyridine a weak base. Its solubility characteristics are also notable; it is described as being miscible with water and soluble in many organic solvents such as ethanol and ether. This broad solubility profile contributes to its effectiveness as a solvent in diverse chemical reactions and its utility in formulating various chemical products. The structure of 3-methylpyridine is fundamental to its application as an intermediate, providing a scaffold for further chemical modifications. For instance, the methyl group can undergo oxidation or halogenation, and the pyridine ring itself can participate in various electrophilic and nucleophilic substitution reactions under specific conditions.

NINGBO INNO PHARMCHEM CO.,LTD. provides 3-methylpyridine that adheres to these high standards of purity and chemical integrity. Understanding the chemical structure and properties of 3-picoline is crucial for its effective utilization in complex synthesis pathways, whether for pharmaceuticals, agrochemicals, or other fine chemical applications. Its position as a meta-substituted pyridine derivative imparts unique reactivity that is leveraged extensively in the chemical industry.