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Pyrrole

CAS Number
109-97-7
EC Number
203-724-7
Chemical Formula
C4H5N
Molecular Weight
67.09 g/mol

Description

Pyrrole (CAS 109-97-7 ), also known by its older designations pyrrhol and imidole, is a five-membered nitrogen-containing heterocycle used as a key synthetic building block across pharmaceutical and agrochemical manufacturing. Its reactivity at multiple ring positions makes it a high-demand intermediate for constructing complex molecular architectures in commercial synthesis workflows and advanced materials production for global industrial sectors. In pharmaceutical manufacturing, this compound serves as a precursor to a broad range of active ingredients, including antifungal agents and kinase inhibitors, where the intact ring is incorporated into the final drug structure. Agrochemical producers use it to synthesize pyrrole-based insecticides and fungicides, with chlorfenapyr being one of the most commercially significant derivatives currently utilized in the global agricultural market. In polymer and materials science, it undergoes oxidative polymerization to produce polypyrrole, a conductive polymer used in antistatic coatings, biosensors, and various energy storage applications for modern electronics. It also carries FEMA 3386 status, supporting its use as a flavor ingredient in food and beverage formulations at trace concentrations, adhering to strict safety guidelines for food-grade chemical additives. The product is supplied as a liquid in standard commercial and high-purity grades. Technical grade material is available for polymer synthesis, while reagent grades serve pharmaceutical and biotechnology applications. Packaging typically ranges from small containers for laboratory procurement to bulk quantities for industrial-scale users, ensuring flexible supply chain solutions for diverse manufacturing requirements and research needs. Contact us for supply of Pyrrole Request Quote

Other Names (Synonyms)

pyrrhol | azole | imidole | 1-aza-2,4-cyclopentadiene | 1H-pyrrole | Pyrrol

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point-23.4 °C
Boiling Point129.7 °C
Density0.9698 g/cm³ @ Temp: 20 °C
Flash Point92 °F
Appearancecolourless to brown liquid with chloroform odour
ColorClear almost colorless to brownish
Odorat 0.10 % in propylene glycol. sweet warm nutty ethereal
FormLiquid
Water Solubility60 g/L (20 ºC)
Vapor Pressure8.7 hPa (20 °C)
Refractive Indexn 20/D 1.508(lit.)
pH>6 (10g/l, H2O, 20℃)
Log P0.85

Safety & Handling

Warning
GHS02· FlammableGHS07· Irritant

Hazard Statements

H226Flammable liquid and vapor
H302Harmful if swallowed

Precautionary Statements

P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233Keep container tightly closed.
P240Ground and bond container and receiving equipment.
P241Use explosion-proof equipment.
P242Use non-sparking tools.
P243Take action to prevent static discharges.
P264Wash … thoroughly after handling.
P270Do not eat, drink or smoke when using this product.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P330Rinse mouth.
P501Dispose of contents/container in accordance with local regulations.
P317Get emergency medical help.
P378Use … for extinction.
P235Store in a well-ventilated place. Keep cool.
P353IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower.

Trade & Regulatory

HS Code29339900
UN Number1992
ADR Class3
Packing GroupIII
Storage Class3 - Flammable liquids
WGK (Germany)2