5-Hydroxy-1-methylpyrazole
Pharmaceutical Materials 2025-03-02
CAS Number: 33641-15-5.
Molecular Formula: C4H6N2O.
Molecular Weight: 98.10 g/mol.
Appearance: Redeyed to white solid powder.
Melting Point: 110-114°C. It is commonly used as an intermediate in the synthesis of various chemicals.
| Attribute | Details |
|---|---|
| Chemical Name | 5-Hydroxy-1-methylpyrazole |
| CAS Number | 33641-15-5 |
| Other Names | 1-Methyl-5-hydroxypyrazole; 5-Hydroxy-1-methyl-1H-pyrazole; 1-Methyl-1H-pyrazol-5-ol |
| Molecular Formula | C4H6N2O |
| Molecular Weight | 98.103 g/mol |
| Appearance | White to pale yellow crystalline powder or solid (may vary in color to orange or green) |
| Melting Point | 110-114°C (may vary slightly) |
| Boiling Point | 217.7±13.0°C at 760 mmHg |
| Density | 1.2±0.1 g/cm³ |
| Solubility | Soluble in DMSO, methanol |
| Refractive Index | 1.568 |
| Chemical Properties | Has both acidic and basic properties; can form complexes with certain metal ions; undergoes oxidation reactions to form oxides |
| Synthesis Method | Commonly synthesized through redox reactions, such as reacting 1-methyl-5-aminopyrazole with excess hydrogen peroxide in benzene or dimethylformamide |
| Applications | Important intermediate in the synthesis of benzoyl pyrazole compounds; used as an intermediate in the preparation of herbicides |
| Stability | Lower stability; should be stored under inert gas to avoid exposure to air |
| Safety Information | May be harmful; handle with appropriate precautions; refer to specific safety data sheets for detailed information |
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