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Name	3-Amino-5-hydroxypyrazole	EINECS	228-095-6
CAS No.	6126-22-3	Density	1.79 g/cm³
PSA	74.93000	LogP	0.27870
Solubility	N/A	Melting Point	214 °C (dec.)(lit.)
Formula	C₃H₅N₃O	Boiling Point	185.55°C (rough estimate)
Molecular Weight	99.0922	Flash Point	N/A
Transport Information	N/A	Appearance	yellow-beige to beige-brown crystalline powder
Safety	26-37/39	Risk Codes	36/37/38
Molecular Structure		Hazard Symbols	Xi
Synonyms	3-Pyrazolidinone, 5-imino- (7CI);3-Amino-2-pyrazolin-5-one;3-Aminopyrazolone;NSC 30480;NSC 34806;NSC 50565;2-Pyrazolin-5-one,3-amino- (6CI,8CI);	Article Data	8

3-Amino-5-hydroxypyrazole Synthetic route

: 140-87-4
Cyanoacetohydrazide

: 6126-22-3
3-amino-2-pyrazolin-5-one

Conditions

Conditions	Yield
With potassium hydroxide In methanol for 2h; Reflux;	95%
With sodium methylate In methanol for 2h; Heating;	80%
With sodium In methanol for 2h; Heating;	80%

: 105-56-6
ethyl 2-cyanoacetate

: 6126-22-3
3-amino-2-pyrazolin-5-one

Conditions

Conditions	Yield
With hydrazine hydrate at 80℃; for 0.0833333h; Microwave irradiation; Green chemistry;	82%

: 2318-25-4
ethyl 3-ethoxy-3-iminopropanoate hydrochloride

: 6126-22-3
3-amino-2-pyrazolin-5-one

Conditions

Conditions	Yield
With hydrazine hydrate; triethylamine In ethanol for 6h; Reflux;	82%

: 67449-75-6, 23973-22-0
ethyl (E)-2-cyano-3-(2-furyl)-2-propenoate

: 6126-22-3
3-amino-2-pyrazolin-5-one

: 3-Amino-4-furan-2-yl-6-hydroxy-1,4-dihydro-pyrano[2,3-c]pyrazole-5-carbonitrile

Conditions

Conditions	Yield
With piperidine In ethanol for 3h; Heating;	90%

: 13450-77-6
4-chlorohippuric acid

: 108-24-7
acetic anhydride

: 122-51-0
orthoformic acid triethyl ester

: 6126-22-3
3-amino-2-pyrazolin-5-one

: N-(1-acetyl-3-amino-6-oxo-1,6-dihydro-pyrano[2,3-c]pyrazol-5-yl)-4-chloro-benzamide

Conditions

Conditions	Yield
Heating;	90%

: 79-04-9
chloroacetyl chloride

: 6126-22-3
3-amino-2-pyrazolin-5-one

: 2-chloro-N-(5-oxo-4,5-dihydro-1H-pyrazol-3-yl)acetamide

Conditions

Conditions	Yield
With triethylamine In tetrahydrofuran for 5h;	86%

: 57031-90-0
ethyl (Z)-3-hydroxy-2-butenoate

: 6126-22-3
3-amino-2-pyrazolin-5-one

: 4-Hydroxy-6-methyl-2,7-dihydro-pyrazolo[3,4-b]pyridin-3-one

Conditions

Conditions	Yield
In acetic acid for 0.5h; Ambient temperature;	85.8%

: 10511-51-0
1-Benzylindole-3-carboxaldehyde

: 6126-22-3
3-amino-2-pyrazolin-5-one

: C19H16N4O

Conditions

Conditions	Yield
With acetic acid In ethanol for 3h; Reflux;	85%

: 3237-22-7
2-cyano-3-(2-furanyl)acrylonitrile

: 6126-22-3
3-amino-2-pyrazolin-5-one

: 3,6-Diamino-4-furan-2-yl-1,4-dihydro-pyrano[2,3-c]pyrazole-5-carbonitrile

Conditions

Conditions	Yield
With piperidine In ethanol for 3h; Heating;	82%

: 6126-22-3
3-amino-2-pyrazolin-5-one

: 18440-58-9
1-(N-phenylhydrazono)-1-chloropropanone

: 93585-28-5
2-Methyl-3-phenylazo-1H-imidazo[1,2-b]pyrazol-6-one

Conditions

Conditions	Yield
With triethylamine In ethanol for 3h; Heating;	82%

3-Amino-5-hydroxypyrazole Chemical Properties

Molecular structure of 3-Amino-5-hydroxypyrazole (CAS NO.6126-22-3) is:

Product Name: 3-Amino-5-hydroxypyrazole
CAS Registry Number: 6126-22-3
IUPAC Name: 3-amino-1,4-dihydropyrazol-5-one
Molecular Weight: 99.0913 [g/mol]
Molecular Formula: C₃H₅N₃O
XLogP3-AA: -1.4
H-Bond Donor: 2
H-Bond Acceptor: 3
EINECS: 228-095-6
Melting Point: 214 °C (dec.)(lit.)
Surface Tension: 84.5 dyne/cm
Density: 1.79 g/cm³
Product Categories: Imidazoles, Pyrroles, Pyrazoles, Pyrrolidines;Amines;Pyrazoles & Triazoles;Pyrazoles & Triazoles;Building Blocks;Heterocyclic Building Blocks;Pyrazoles

3-Amino-5-hydroxypyrazole Safety Profile

Safty information about 3-Amino-5-hydroxypyrazole (CAS NO.6126-22-3) is:
Hazard Codes: Irritant Xi
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-37/39
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S37/39:Wear suitable gloves and eye/face protection.
WGK Germany: 3

3-Amino-5-hydroxypyrazole Specification

3-Amino-5-hydroxypyrazole , its cas register number is 6126-22-3. It also can be called 3-Amino-1H-pyrazol-5-ol ; 3-Amino-2-pyrazolin-5-one ; 5-Amino-2,3-dihydro-1H-pyrazol-3-one .It is a yellow-beige to beige-brown crystalline powder.

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