CAS No.33641-15-5,5-Hydroxy-1-methylpyrazole Suppliers,MSDS download

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Basic Information

Molecular Structure:
CAS No.:	33641-15-5
Name:	5-Hydroxy-1-methylpyrazole
Article Data:	16

Formula:	C₄H₆N₂O
Molecular Weight:	98.1044
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-;
Density:	1.229 g/cm³
Melting Point:	110-114 °C
Boiling Point:	217.662 °C at 760 mmHg
Flash Point:	85.439 °C
Hazard Symbols:
Risk Codes:	22-37/38-41
Safety:	26-39
PSA:	38.05000
LogP:	0.12570

Synthetic route

: 88398-78-1
1-methyl-5-hydroxypyrazol-4-carboxylic acid ethyl ester

: 33641-15-5
1-methyl-5-hydroxypyrazole

Conditions

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;

: 34846-90-7
methyl 3-methoxyprop-2-enoate

: 60-34-4
methylhydrazine

: 33641-15-5
1-methyl-5-hydroxypyrazole

Conditions

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;

aqueous monomethylhydrazine: aqueous monomethylhydrazine

: 75945-54-9
β-isobutoxyacryl chloride

: 33641-15-5
1-methyl-5-hydroxypyrazole

Conditions

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

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

Conditions	Yield
In methanol for 16h; Reflux; Inert atmosphere;

: C6H8N2O3

: 33641-15-5
1-methyl-5-hydroxypyrazole

Conditions

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

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

...Expand

: 110964-80-2
4-methylsulphonyl-2-nitrobenzoyl chloride

: 33641-15-5
1-methyl-5-hydroxypyrazole

: (1-methyl-5-hydroxypyrazol-4-yl)-(4-methanesulfonyl-2-nitrophenyl)methanone

Conditions

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

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

Conditions	Yield
With pyridine; thionyl chloride In ethyl acetate at -25 - 0℃; Inert atmosphere;	90.7%

Raw Materials

34846-90-7

5788-17-0

60-34-4

Downstream Products

117007-77-9

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Chemistry

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

Safety Profile

Hazard Codes: Harmful 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.

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- .