3-Methyl-5-pyrazolone
CAS 108-26-9
EC 203-565-3
Formula C4H6N2O
MW 98.1 g/mol
Pharmaceutical Intermediates Pharmaceuticals & HealthcareTextile, Leather & PaperPrinting & Packaging Polymerization Initiation
Description
3-Methyl-5-pyrazolone (CAS 108-26-9, EC 203-565-3, formula C4H6N2O) is a pyrazolone-class heterocyclic compound, also referenced under trade designations AURORA KA-6219 and TIMTEC-BB SBB004372, and by the synonyms 3-methyl-2-pyrazolin-5-one and 3-Methyl-pyrazolon-(5). It carries no assigned E-code and is classified as a pharmaceutical intermediate.
In pharmaceutical synthesis, it serves as a key building block for antipyretic and analgesic active ingredients, where its reactive carbonyl and NH groups enable condensation with other intermediates. It also functions as a polymerization initiator in specialty polymer systems and is applied in dye synthesis for textile, leather, paper, and printing industries, where it couples with diazonium salts to form azo colorants.
This material is supplied as a yellowish powder to crystal under REACH compliance and is available for procurement under HS code 29331990. Buyers should confirm grade specifications, certificate of analysis requirements, and packaging formats directly with the supplier to align with their regulatory and formulation needs.
In pharmaceutical synthesis, it serves as a key building block for antipyretic and analgesic active ingredients, where its reactive carbonyl and NH groups enable condensation with other intermediates. It also functions as a polymerization initiator in specialty polymer systems and is applied in dye synthesis for textile, leather, paper, and printing industries, where it couples with diazonium salts to form azo colorants.
This material is supplied as a yellowish powder to crystal under REACH compliance and is available for procurement under HS code 29331990. Buyers should confirm grade specifications, certificate of analysis requirements, and packaging formats directly with the supplier to align with their regulatory and formulation needs.
Physical Properties
| Melting Point | 217-219 °C |
| Boiling Point | 183.6°C (rough estimate) |
| Density | 1.1890 (rough estimate) |
| Appearance | Yellowish powder |
| Color | White to Light yellow |
| Form | powder to crystal |
| Refractive Index | 1.4327 (estimate) |
Safety & Handling (Learn More)
Warning GHS09
H
H400H410
P
P273P391P501
Trade & Regulatory
| HS Code | 29331990 |
| WGK (Germany) | 3 |
Other Names
3-methyl-1,4-dihydropyrazol-5-one3-methyl-2-pyrazolin-5-oneTIMTEC-BB SBB0043723-Methyl-pyrazolon-(5)3-methyl-2-pyrazolin-5-on3-Methyl-Δ2-pyrazol-5-one
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Raw Materials
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