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Cas Database |
| Name |
5-Hydroxy-1-methylpyrazole |
EINECS | N/A |
| CAS No. | 33641-15-5 | Density | 1.229 g/cm3 |
| PSA | 38.05000 | LogP | 0.12570 |
| Solubility | N/A | Melting Point |
110-114 °C |
| Formula | C4H6N2O | Boiling Point | 217.662 °C at 760 mmHg |
| Molecular Weight | 98.1044 | Flash Point | 85.439 °C |
| Transport Information | N/A | Appearance | N/A |
| Safety | 26-39 | Risk Codes | 22-37/38-41 |
| Molecular Structure |
|
Hazard Symbols |
|
| Synonyms |
Pyrazol-5-ol,1-methyl- (8CI);1-Methyl-1H-pyrazol-5-ol;1-Methyl-5-hydroxy-1H-pyrazole;1-Methyl-5-hydroxypyrazole;5-Hydroxy-1-methyl-5-pyrazole;1H-Pyrazol-5-ol,1-methyl-; |
Article Data | 16 |
5-Hydroxy-1-methylpyrazole Synthetic route
- 88398-78-1
1-methyl-5-hydroxypyrazol-4-carboxylic acid ethyl ester
- 33641-15-5
1-methyl-5-hydroxypyrazole
| Conditions | Yield |
|---|---|
| Stage #1: 1-methyl-5-hydroxypyrazol-4-carboxylic acid ethyl ester With sodium hydroxide In water at 40℃; for 3h; Stage #2: With hydrogenchloride for 3h; Reflux; | 98% |
| at 120℃; for 6h; Temperature; |
| Conditions | Yield |
|---|---|
| In methanol at 0℃; for 4.66667h; Heating / reflux; | 73% |
| In water at 10℃; Temperature; | 69.6% |
| In methanol for 8h; Reflux; Inert atmosphere; | |
| In methanol; water for 2h; Cooling with ice; |
- 75945-54-9
β-isobutoxyacryl chloride
- 33641-15-5
1-methyl-5-hydroxypyrazole
| Conditions | Yield |
|---|---|
| With hydrogenchloride; triethylamine In tetrahydrofuran |
- 5788-17-0
methyl (2E)-3-methoxy-2-propenoate
- 60-34-4
methylhydrazine
- 33641-15-5
1-methyl-5-hydroxypyrazole
| Conditions | Yield |
|---|---|
| In methanol at 90℃; for 12 - 18h; |
- 623-43-8, 4358-59-2, 18707-60-3, 130981-57-6
methyl crotonate
- 60-34-4
methylhydrazine
- 33641-15-5
1-methyl-5-hydroxypyrazole
| Conditions | Yield |
|---|---|
| In methanol for 16h; Reflux; Inert atmosphere; |
- 33641-15-5
1-methyl-5-hydroxypyrazole
| Conditions | Yield |
|---|---|
| With sulfuric acid at 65℃; for 8h; Temperature; | 18.6 g |
- 123-91-1
1,4-dioxane
- 247922-29-8
3-(3-bromo-2-methyl-6-(methylsulfonyl)phenyl)-4,5-dihydroisoxazole
- 33641-15-5
1-methyl-5-hydroxypyrazole
- 210631-68-8
topramezone
| Conditions | Yield |
|---|---|
| With carbon monoxide; potassium carbonate; triethylamine; triphenylphosphine; palladium(II) chloride In water | 100% |
| With hydrogenchloride; potassium carbonate; triethylamine; bis(triphenylphosphine)palladium(II) dichloride In water |
- 110964-80-2
4-methylsulphonyl-2-nitrobenzoyl chloride
- 33641-15-5
1-methyl-5-hydroxypyrazole
| Conditions | Yield |
|---|---|
| With triethylamine In 1,4-dioxane at 5 - 40℃; for 2h; | 96% |
- 1196958-18-5
2-methyl-3-ethylsulfinyl-4-methylsulfonylbenzoic acid
- 33641-15-5
1-methyl-5-hydroxypyrazole
- 1196958-05-0
[3-(ethylsulfinyl)-2-methyl-4-(methylsulfonyl)phenyl](5-hydroxy-1-methyl-1H-pyrazol-4-yl)methanone
| Conditions | Yield |
|---|---|
| With pyridine; thionyl chloride In ethyl acetate at -25 - 0℃; Inert atmosphere; | 91% |
- 1070761-73-7
2-methyl-3-(methylsulfinyl)-4-(trifluoromethyl)benzoic acid
- 33641-15-5
1-methyl-5-hydroxypyrazole
- 1070761-52-2
(5-hydroxy-1-methyl-1H-pyrazol-4-yl)[2-methyl-3-(methyl-sulfinyl)-4-(trifluoromethyl)phenyl]methanone
| Conditions | Yield |
|---|---|
| With pyridine; thionyl chloride In ethyl acetate at -25 - 0℃; Inert atmosphere; | 90.7% |
5-Hydroxy-1-methylpyrazole Chemical Properties
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Systematic Name: 1-Methyl-1H-pyrazol-5-ol
SMILES: Oc1ccnn1C
InChI: InChI=1/C4H6N2O/c1-6-4(7)2-3-5-6/h2-3,7H,1H3
InChIKey: CMXOTACIOGGSNH-UHFFFAOYAF
Empirical Formula: C4H6N2O
Molecular Weight: 98.1032
Product Categories: Heterocyclic Compounds
Index of Refraction: 1.568
Molar Refractivity: 26.102 cm3
Molar Volume: 79.836 cm3
Surface Tension: 44.34 dyne/cm
Density: 1.229 g/cm3
Flash Point: 85.439 °C
Enthalpy of Vaporization: 47.253 kJ/mol
Boiling Point: 217.662 °C at 760 mmHg
Vapour Pressure: 0.089 mmHg at 25 °C
Melting Point of 5-Hydroxy-1-methylpyrazole (CAS NO.33641-15-5): 110-114 °C
5-Hydroxy-1-methylpyrazole Safety Profile
Hazard Codes: 
Xn
Risk Statements: 22-37/38-41
R22:Harmful if swallowed.
R37/38:Irritating to respiratory system and skin.
R41:Risk of serious damage to the eyes.
Safety Statements: 26-39
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S39:Wear eye / face protection.
5-Hydroxy-1-methylpyrazole Specification
5-Hydroxy-1-methylpyrazole (CAS NO.33641-15-5), its Synonyms are Pyrazol-5-ol,1-methyl- (8CI) ; 1-Methyl-5-hydroxy-1H-pyrazole ; 1-Methyl-1H-pyrazol-5-ol ; 1-Methyl-5-hydroxy-1H-pyrazole ; 5-Hydroxy-1-methyl-5-pyrazole ; 1H-Pyrazol-5-ol,1-methyl- .
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