Pyridine
CAS 110-86-1C5H5N79.1 g/mol
Pyridine is an azaarene comprising a benzene core in which one -CH group is replaced by a nitrogen atom. It is the parent compound of the class pyridines. It has a role as an environmental contaminant. It is a member of pyridines, a mancude organic heteromonocyclic parent, a monocyclic heteroarene and an azaarene.
IUPAC: pyridine
PubChem
Physical & Chemical Properties
| Melting Point | -44 °F (NTP, 1992) |
| Boiling Point | 239 °F at 760 mmHg (NTP, 1992) |
| Density | 0.983 at 68 °F (USCG, 1999) - Less dense than water; will float |
| Solubility | greater than or equal to 100 mg/mL at 70.7 °F (NTP, 1992) |
| Flash Point | 68 °F (NTP, 1992) |
| Vapor Pressure | 18 mmHg at 68 °F ; 20 mmHg at 77 °F (NTP, 1992) |
| pH | 8.5 (0.2 molar soln in water) |
| Appearance | Pyridine appears as a clear colorless to light yellow liquid with a penetrating nauseating odor. Vapors are heavier than air. Toxic by ingestion and inhalation. Combustion produces toxic oxides of nitrogen. |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 2933
Data: UN Comtrade
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