Isoquinoline

As a core industrial chemical, isoquinoline appears as a colorless to pale yellow liquid or low-melting solid with a characteristic pungent odor. It has a melting point of 26–28℃, a boiling point of 243℃ (at normal pressure), a density of approximately 1.099g/cm³ (20℃), and a flash point of 107℃ (closed cup). It is slightly soluble in cold water, freely soluble in hot water, and miscible with most organic solvents such as ethanol, ether, benzene, and chloroform. Strict storage and transportation conditions must be followed to maintain its stability and prevent degradation.

For quality control, isoquinoline complies with strict industrial grade standards: purity ≥98.0% (GC); related substances (individual ≤0.1%, total ≤2.0%); appearance (colorless to pale yellow liquid/solid, no visible impurities) and packing integrity (well-packed 200kg galvanized steel drums without damage). It also controls water content (<0.2%), residual solvents (methanol ≤0.3%, ethanol ≤0.5%), heavy metals (≤10 ppm), loss on drying (≤0.5%) and residue on ignition (≤0.1%) to ensure batch consistency and product safety.

Industrially, isoquinoline is widely applied: in the pharmaceutical field, it is used to synthesize antimalarial drugs, analgesics, and antitumor agents; in the dye industry, it serves as an intermediate for vat dyes and acid dyes; in the rubber industry, it acts as an antioxidant and vulcanization accelerator; it also functions as a corrosion inhibitor, organic solvent, and chiral ligand in asymmetric catalysis.

Isoquinoline is a hazardous chemical (UN 2656, Class 6.1 Toxic Substance, Packing Group III). It is harmful if swallowed or in contact with skin, causes eye and skin irritation, and is toxic to aquatic organisms with long-term environmental hazards. Proper protective equipment should be worn during operation, and storage/transportation must strictly follow the specifications for hazardous chemicals.