Lepidine, chemically identified as 4-Methylquinoline and bearing the CAS number 491-35-0, is an aromatic heterocyclic organic compound whose chemical characteristics underpin its industrial utility. Understanding its properties is fundamental for its effective application in various sectors, from flavors and fragrances to fine chemicals and potential pharmaceutical intermediates.

Physically, Lepidine is typically described as a colorless to yellow clear liquid. Its molecular formula is C10H9N, with a molecular mass of approximately 143.19 g/mol. Key physical properties include a melting point around 9.5 °C and a boiling point of approximately 261-263 °C at standard pressure. Its density is around 1.0826 g/cm³ at 20 °C. These parameters are critical for handling, storage, and processing in industrial settings. The compound's solubility in water is relatively low, but it is soluble in organic solvents like alcohol, which is common for many aromatic organic compounds.

A notable chemical characteristic of Lepidine is the reactivity of its methyl group. This methyl group is described as being fairly acidic, which allows for condensation reactions to occur at this position, particularly when the nitrogen atom in the quinoline ring is quaternized. This reactivity makes Lepidine a valuable precursor in organic synthesis, enabling the formation of more complex molecular structures. Its use in the preparation of certain dyes is a testament to this synthetic versatility.

From a safety perspective, Lepidine is classified as an irritant (Xi), with warnings regarding its potential to irritate the eyes, respiratory system, and skin (R36/37/38). Appropriate handling precautions, including wearing protective clothing and avoiding contact with skin and eyes, are therefore essential. Safety data sheets (SDS) provide detailed information on hazard identification and precautionary measures.

The synthesis of Lepidine and its derivatives is an active area of research, with various methods explored to achieve efficient production. The availability of Lepidine from chemical suppliers, often with high purity standards, ensures that researchers and manufacturers can readily access this compound for their specific needs. Whether seeking to buy Lepidine for established applications or exploring new chemical pathways, its fundamental properties make it a compound of continued interest in the chemical industry.