3-Methyl-2-pyrazolin-5-one
Synonym(s):2,4-Dihydro-5-methyl-3H-pyrazol-3-one;3-Methyl-2-pyrazolin-5-one
- CAS NO.：108-26-9
- Empirical Formula: C4H6N2O
- Molecular Weight: 98.1
- MDL number: MFCD00020699
- EINECS: 203-565-3
- SAFETY DATA SHEET (SDS)
- Update Date: 2025-07-04 15:23:43
What is 3-Methyl-2-pyrazolin-5-one?
Chemical properties
3-Methyl-2-pyrazolin-5-one is yellowish powder
The Uses of 3-Methyl-2-pyrazolin-5-one
3-Methyl-2-pyrazolin-5-one is used as intermediate for the manufacture of dyestuffs as well as for agrochemicals.
The Uses of 3-Methyl-2-pyrazolin-5-one
3-Methyl-2-pyrazolin-5-one is used in the preparation of spirocyclic [indole-3,4'-pyrano[2,3-c]pyrazole] by reacting with isatins and malonitrile in the presence of sodium bromide as electrolyte.
Properties of 3-Methyl-2-pyrazolin-5-one
| Melting point: | 220-224 °C |
| Boiling point: | 183.6°C (rough estimate) |
| Density | 1.1890 (rough estimate) |
| refractive index | 1.4327 (estimate) |
| storage temp. | Sealed in dry,Room Temperature |
| solubility | Slightly soluble in ethanol. |
| form | powder to crystal |
| pka | 13.10±0.40(Predicted) |
| color | White to Light yellow |
| CAS DataBase Reference | 108-26-9(CAS DataBase Reference) |
| NIST Chemistry Reference | 3H-pyrazol-3-one, 2,4-dihydro-5-methyl-(108-26-9) |
| EPA Substance Registry System | 3H-Pyrazol-3-one, 2,4-dihydro-5-methyl- (108-26-9) |
Safety information for 3-Methyl-2-pyrazolin-5-one
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P280:Wear protective gloves/protective clothing/eye protection/face protection. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P405:Store locked up. |
Computed Descriptors for 3-Methyl-2-pyrazolin-5-one
3-Methyl-2-pyrazolin-5-one manufacturer
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