ChemicalBook > CAS DataBase List > 5-amino-1,2-dihydropyrazol-3-one
5-amino-1,2-dihydropyrazol-3-one
- Product Name
- 5-amino-1,2-dihydropyrazol-3-one
- CAS No.
- 28491-52-3
- Chemical Name
- 5-amino-1,2-dihydropyrazol-3-one
- Synonyms
- 5-amino-1,2-dihydro-3H-pyrazol-3-one;-5-one;5-Amino-1H-pyrazol-3(2H);3-Amino-3-pyrazolin-5-one;3-Amino-1,2-dihydropyrazoL;5-AMino-1H-pyrazol-3(2H)-one;5-Amino-3-hydroxy-1H-pyrazole;3-Amino-1,2-dihydropyrazol-5-one;5-amino-1,2-dihydropyrazol-3-one;3H-Pyrazol-3-one,5-amino-1,2-dihydro-
- CBNumber
- CB51463409
- Molecular Formula
- C3H5N3O
- Formula Weight
- 99.09
- MOL File
- 28491-52-3.mol
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5-amino-1,2-dihydropyrazol-3-one Property
- Melting point:
- 204℃
- Density
- 1.301
- storage temp.
- under inert gas (nitrogen or Argon) at 2–8 °C
- pka
- 8.31±0.70(Predicted)
- Appearance
- Light brown to brown Solid
- InChI
- InChI=1S/C3H5N3O/c4-2-1-3(7)6-5-2/h1H,(H4,4,5,6,7)
- InChIKey
- QZBGOTVBHYKUDS-UHFFFAOYSA-N
- SMILES
- N1C(N)=CC(=O)N1
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N-Bromosuccinimide Price
Synthonix
- Product number
- A0899
- Product name
- 5-Amino-1,2-dihydropyrazol-3-one
- Purity
- 97%
- Packaging
- 1g
- Price
- $15
- Updated
- 2026/05/06
Synthonix
- Product number
- A0899
- Product name
- 5-Amino-1,2-dihydropyrazol-3-one
- Purity
- 97%
- Packaging
- 5g
- Price
- $23
- Updated
- 2026/05/06
Synthonix
- Product number
- A0899
- Product name
- 5-Amino-1,2-dihydropyrazol-3-one
- Purity
- 97%
- Packaging
- 10g
- Price
- $30
- Updated
- 2026/05/06
Synthonix
- Product number
- A0899
- Product name
- 5-Amino-1,2-dihydropyrazol-3-one
- Purity
- 97%
- Packaging
- 25g
- Price
- $70
- Updated
- 2026/05/06
Synthonix
- Product number
- A0899
- Product name
- 5-Amino-1,2-dihydropyrazol-3-one
- Purity
- 97%
- Packaging
- 100g
- Price
- $210
- Updated
- 2026/05/06
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5-amino-1,2-dihydropyrazol-3-one Chemical Properties,Usage,Production
Synthesis
37832-55-6
28491-52-3
General procedure for the synthesis of 5-amino-1H-pyrazol-3-one from 5-oxo-2,5-dihydro-1H-pyrazole-3-carboxylic acid: to a reaction flask was added toluene (500 mL), triethylamine (138.6 mL, 1.0 mol, 2.0 eq), and 5-hydroxy-4-carboxylic acid ester (64 g, 0.5 mol, 1.0 eq) made in step (1). After raising the temperature of the reaction system to 80°C, diphenylphosphoryl azide (DPPA, 162.5 mL, 0.75 mol, 1.5 eq) was slowly added and stirred continuously for 5 hours at this temperature. After the reaction was completed, the system was cooled to room temperature. The reaction solution was concentrated, 500 mL of saturated aqueous ammonium chloride solution was added, the precipitated white precipitate was collected and dried to give 5-amino-1,2-dihydro-pyrazol-3-one 44.7 g in 90% yield.
References
[1] Patent: CN105541719, 2016, A. Location in patent: Paragraph 0028; 0030
5-amino-1,2-dihydropyrazol-3-one Preparation Products And Raw materials
Raw materials
Preparation Products
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5-amino-1,2-dihydropyrazol-3-one Suppliers
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View Lastest Price from 5-amino-1,2-dihydropyrazol-3-one manufacturers
Shenzhen Nexcon Pharmatechs Ltd.
- Product
- 5-amino-1,2-dihydropyrazol-3-one 28491-52-3
- Price
- US $0.00-0.00/KG
- Min. Order
- 1KG
- Purity
- 98%
- Supply Ability
- 2000
- Release date
- 2025-09-04
Honest Joy Holdings Limited
- Product
- 3-Amino-1,2-dihydropyrazol-5-one 28491-52-3
- Price
- US $0.00/KG
- Min. Order
- 1KG
- Purity
- 99.5%
- Supply Ability
- 100 tons
- Release date
- 2022-01-14
Career Henan Chemical Co
- Product
- 5-amino-1,2-dihydropyrazol-3-one 28491-52-3
- Price
- US $1.00/KG
- Min. Order
- 1KG
- Purity
- 96%
- Supply Ability
- 500kg
- Release date
- 2018-08-20