PYRROLE

PYRROLE

PRODUCT IDENTIFICATION

CAS NO.

109-97-7

PYRROLE

EINECS NO. 203-724-7

FORMULA C₄H₅N

MOL WT. 67.09

H.S. CODE 2933.99

TOXICITY

SYNONYMS 1H-Pyrrole; Azole; Divinylenimine; Imidole;

SMILES

CLASSIFICATION

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

pale yellow liquid

MELTING POINT - 23 C

BOILING POINT 129 - 131 C

SPECIFIC GRAVITY 0.965 - 0.975

SOLUBILITY IN WATER

pH > 6 (10%)

VAPOR DENSITY

AUTOIGNITION

550 C

NFPA RATINGS

Health: 2 Flammability: 2 Reactivity: 0

REFRACTIVE INDEX

1.5082

FLASH POINT

33 C

STABILITY Stable under ordinary conditions

GENERAL DESCRIPTION AND APPLICATIONS

Pyrrole: One of a class of organic heterocyclic compounds of five-membered diunsaturated ring structure composed of four carbon atoms and one nitrogen atom. The simplest member of the pyrrole family is pyrrole itself, a basic heterocyclic compound; colorless to pale yellow, toxic oil with pungent taste and similar to chloroform odor; insoluble in water; soluble in alcohol, ether, and dilute acids; boils at 129 - 131 C; polymerizes in light. Pyrrole ring system is involved in coloured products (green pigment, chlorophyll; red, hemoglobin; , blue, indigo) in nature. Pyrrolidine, the saturated tetrahydropyrrole, is part of the structures of amino acids (proline, hydroxyproline and hygrine). Pyrroline is a pyrrole in which one of the two solid bonds has been hydrogenated. Pyrrole and its derivatives are widely used as an intermediate in synthesis of pharmaceuticals, medicines, agrochemicals, dyes, photographic chemicals, perfumes and other organic compounds. They are also used as catalysts for polymerization process, corrosion inhibitors, preservatives, and as solvents for resins and terpenes. They are used in metallurgical processes. They are useful in the intensive study of transition-metal complex catalyst chemistry for uniform polymerization, luminescence chemistry and spectrophotometric analysis.

Triazole: An analog of imidazole. It has three nitrogen atoms and two carbon atoms at nonadjacent positions in the ring system.
Pyrrole: An analog of imidazole. It has only one nitrogen atom in the ring system. Pyrrole ring system is involved in coloured products (green pigment, chlorophyll; red, hemoglobin; , blue, indigo) in nature.
Pyrroline: A pyrrole in which one of the two solid bonds are hydrogenated.
Pyrrolidine: The saturated tetrahydropyrrole, a part of the structures of amino acids (proline, hydroxyproline and hygrine).
Pyrazole: 1,2-Diazole (Imidazole isomer). The nitrogen positions are 1 and 2. It is not found in nature
Pyrazolone: Pyrazole analog with ketone group at 5 position
Oxazole: an analog of imidazole. The nitrogen atom in position 1 is replaced by oxygen.
Isoxazole: an analog of pyrazole. The nitrogen atom at position 1 is replaced by oxygen.
Isothiazole:an analog of pyrazole. The nitrogen atom at position 1 is replaced by sulfur.