Pyrrole (Pyrrole, 1- aza -2,4- cyclopentadiene), one of heterocyclic compounds. Molecular formula C4H5N, molecular weight: 67.09, CAS 109-97-7. The melting point is -23 C, boiling point is 129-131 C, and the density is 0.967g/cm3. Multiple pyrrole rings can form larger rings, such as the porphyrin ring in hemoglobin, the porphyrin ring in chlorophyll and the Gulin ring in vitamin B12.
Chinese Name: pyrrole
Chinese alias: nitrogen heterocyclic; nitrogen (MAO); two ethyleneimine, nitrogen oxide; diaza ring;
English Name: 1H-pyrrole
English alias: Monopyrrole; 1H-Pyrrole; Pyrrol; FEMA 3386; Divinylenimine;
Molecular formula: C4H5N
Molecular weight: 67.08920
Precise quality: 67.04220
Appearance and properties: colorless to brown liquid with chlorine odor.
Density: 0.967 g/mL at 25 ºC (lit.)
Melting point: -23 ºC
Boiling point: 131 ºC (lit.)
Flash point: 92 ºF
Refractive index: n20/D 1.508 (lit.)
Water solubility: 60 g/L (20ºC)
Stability: Stable. Incompatible with strong acids, strong oxidizing agents. Combustible.
Storage conditions: storehouse ventilation, low temperature drying, separate storage with oxidizer, steam density: 2.31 (vs air)
Package level: III
Risk category: 3
Customs Code: 2933990090
Dangerous goods transportation Code: UN 1992 3/PG 3
Danger category code: R10; R20; R25; R41
Safety instructions: S26-S37/39-S45-S39-S24-S16
Dangerous goods sign: T
Used as a certified reference material for chromatographic analysis, and also for organic synthesis and pharmaceutical industry. It is mainly used as solvent for polyester fiber spinning. They are also used as metal preservatives, curing agents for epoxy resin, catalysts for olefin polymerization and raw materials for pharmaceutical industry. It is also used as photosensitizer.