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Isoquinoline

IUPAC: isoquinoline

C9H7N Organic Compounds CAS 119-65-3
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Quick Reference
Formula / NotationC9H7N
CAS Number119-65-3
Molecular Weight129.16
Melting Point26.47 °C
Boiling Point243.2 °C
Density1.097-1.103
Solubility4520 mg/L (at 25 °C)
AppearanceLiquid
Also Known As119-65-3; 2-Benzazine; 2-Azanaphthalene; Leucoline; beta-Quinoline; Isochinolin; Benzo[c]pyridine; 3,4-Benzopyridine; Benzo(c)pyridine; FEMA No. 2978
CategoryOrganic Compounds

What is Isoquinoline?

Isoquinoline is an ortho-fused heteroarene that is a benzopyridine in which the N atom not directly attached to the benzene ring. It is a member of isoquinolines, a mancude organic heterobicyclic parent, an azaarene and an ortho-fused heteroarene.

Formula & Notation

C9H7N

IUPAC Name: isoquinoline

Other Names / Synonyms: 119-65-3; 2-Benzazine; 2-Azanaphthalene; Leucoline; beta-Quinoline; Isochinolin; Benzo[c]pyridine; 3,4-Benzopyridine; Benzo(c)pyridine; FEMA No. 2978

Properties & Characteristics

Appearance: Liquid. Molecular formula: C9H7N. Molecular weight: 129.16 g/mol. Boiling point: 243.2 °C. Melting point: 26.47 °C. Density: 1.097-1.103. Solubility: 4520 mg/L (at 25 °C). LogP: 2.1.

Physical Data

PropertyValue
Melting Point26.47 °C
Boiling Point243.2 °C
Density1.097-1.103
Molecular Weight129.16
Solubility4520 mg/L (at 25 °C)
AppearanceLiquid

Uses & Applications

Used as an industrial feedstock, solvent, pharmaceutical intermediate, flavoring agent, or chemical building block.

Safety Information

Flammable or irritant. Many organic compounds are flammable liquids or vapours. Keep away from ignition sources. Consult SDS for specific hazard data.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Isoquinoline
Formula C9H7N
CAS Number 119-65-3
Molecular Weight 129.16
Synonyms 119-65-3; 2-Benzazine; 2-Azanaphthalene; Leucoline; beta-Quinoline; Isochinolin; Benzo[c]pyridine; 3,4-Benzopyridine; Benzo(c)pyridine; FEMA No. 2978

Frequently Asked Questions

Isoquinoline is an ortho-fused heteroarene that is a benzopyridine in which the N atom not directly attached to the benzene ring. It is a member of isoquinolines, a mancude organic heterobicyclic parent, an azaarene and an ortho-fused heteroarene.

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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.