Pyrrole
CAS 109-97-7C4H5N67.09 g/mol
1H-pyrrole is a tautomer of pyrrole that has the double bonds at positions 2 and 4. It is a secondary amine and a pyrrole. It is a tautomer of a 3H-pyrrole and a 2H-pyrrole.
IUPAC: 1H-pyrrole
PubChem
Physical & Chemical Properties
| Melting Point | -23.4 °C |
| Boiling Point | 129.7 °C |
| Density | 0.9698 @ 20 °C |
| Solubility | Soluble in alcohol, ether and dilute acids. Also soluble in most organic chemicals. |
| Flash Point | 102 °F (39 °C) (CLOSED CUP) |
| Vapor Pressure | 8.36 [mmHg] |
| Appearance | Colorless liquid with an agreeable odor like chloroform; Darkens on standing if oxygen not completely removed; [Merck Index] Yellowish or brown liquid; Turns brown when polymerized by light; [Hawley] Hygroscopic; [HSDB] Colorless liquid; [MSDSonline] |
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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