Pyrrole
CAS Number
109-97-7
EC Number
203-724-7
FEMA Number
FEMA 3386
What is Pyrrole?
Pyrrole (CAS 109-97-7), also known as pyrrhol and imidole, is a five-membered nitrogen-containing heterocycle used as a synthetic building block in pharmaceutical and agrochemical manufacturing. FEMA 3386.
Where is Pyrrole used?
- Pharmaceuticals: precursor to active ingredients such as antifungal agents and kinase inhibitors, with the intact ring incorporated into the final drug structure
- Agrochemicals: synthesis of pyrrole-based insecticides and fungicides, including chlorfenapyr
- Polymer and materials science: oxidative polymerization to polypyrrole for antistatic coatings, biosensors and energy storage
- It undergoes oxidative polymerization to produce polypyrrole, a conductive polymer.
Commercial specifications
- Liquid in standard commercial and high-purity grades
- Packaging from small laboratory containers to bulk quantities
Other Names (Synonyms)
pyrrhol|azole|imidole|1-aza-2,4-cyclopentadiene|1H-pyrrole|Pyrrol
What are the physical properties of Pyrrole?
Melting Point -23.4 °C
Boiling Point 129.7 °C
Density 0.9698 g/cm³ @ Temp: 20 °C
Flash Point 92 °F
Appearance colourless to brown liquid with chloroform odour
Color Clear almost colorless to brownish
Odor at 0.10 % in propylene glycol. sweet warm nutty ethereal
Form Liquid
Water Solubility 60 g/L (20 ºC)
Vapor Pressure 8.7 hPa (20 °C)
Refractive Index n 20/D 1.508(lit.)
pH >6 (10g/l, H2O, 20℃)
Log P 0.85
How is Pyrrole classified and handled safely? Learn More
Warning
GHS02· Flammable GHS07· Irritant
Hazard Statements
H226 Flammable liquid and vapor
H302 Harmful if swallowed
Precautionary Statements
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233 Keep container tightly closed.
P240 Ground and bond container and receiving equipment.
P241 Use explosion-proof [electrical/ventilating/lighting/…] equipment.
Which trade and regulatory codes apply to Pyrrole?
HS Code 29339900
UN Number 1992
ADR Class 3
Packing Group III
Storage Class 3 - Flammable liquids
WGK (Germany) 2