ChemicalBook >> CAS DataBase List >>3-Methyl-2-pyrazolin-5-one
3-Methyl-2-pyrazolin-5-one
- CAS No.
- 108-26-9
- Chemical Name:
- 3-Methyl-2-pyrazolin-5-one
- Synonyms
- 5-Methyl-2,4-dihydro-3H-pyrazol-3-one;3-METHYL-5-PYRAZOLONE;3-Methyl-1H-pyrazol-5(4H)-one;5-Methyl-2,4-dihydro-pyrazol-3-one;-5-pyrazoL;AURORA KA-6219;TIMTEC-BB SBB004372;Methyl-5-pyrazolone;3-Methyl-pyrazolon-(5);3-methyl pyrazole-5-one
- CBNumber:
- CB4703239
- Molecular Formula:
- C4H6N2O
- Molecular Weight:
- 98.1
- MDL Number:
- MFCD00020699
- MOL File:
- 108-26-9.mol
- MSDS File:
- SDS
- TDS File:
- TDS
Last updated:2026-05-28 01:28:01
| Melting point | 220-224 °C |
|---|---|
| Boiling point | 183.6°C (rough estimate) |
| Density | 1.1890 (rough estimate) |
| refractive index | 1.4327 (estimate) |
| storage temp. | Sealed in dry,Room Temperature |
| solubility | Slightly soluble in ethanol. |
| pka | 13.10±0.40(Predicted) |
| form | powder to crystal |
| color | White to Light yellow |
| InChI | InChI=1S/C4H6N2O/c1-3-2-4(7)6-5-3/h2H2,1H3,(H,6,7) |
| InChIKey | NHLAPJMCARJFOG-UHFFFAOYSA-N |
| SMILES | N1=C(C)CC(=O)N1 |
| CAS DataBase Reference | 108-26-9(CAS DataBase Reference) |
| EWG's Food Scores | 1 |
| FDA UNII | P378M0497D |
| NIST Chemistry Reference | 3H-pyrazol-3-one, 2,4-dihydro-5-methyl-(108-26-9) |
| EPA Substance Registry System | 3H-Pyrazol-3-one, 2,4-dihydro-5-methyl- (108-26-9) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |  GHS07 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Warning | |||||||||
| Hazard statements | H315-H319-H335 | |||||||||
| Precautionary statements | P261-P280a-P304+P340-P305+P351+P338-P405-P501a-P264-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313 | |||||||||
| Risk Statements | 36/37/38 | |||||||||
| Safety Statements | 24/25 | |||||||||
| WGK Germany | 3 | |||||||||
| RTECS | UQ9451500 | |||||||||
| TSCA | TSCA listed | |||||||||
| HS Code | 29331990 | |||||||||
| Toxicity | rat,LDLo,unreported,600mg/kg (600mg/kg),Biochemical Pharmacology. Vol. 14, Pg. 1325, 1965. | |||||||||
| REACH Registrations | Active | |||||||||
| NFPA 704 |
|
3-Methyl-2-pyrazolin-5-one price More Price(54)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| TCI Chemical | M0491 | 3-Methyl-5-pyrazolone >98.0%(T) | 108-26-9 | 25g | $42 | 2026-04-30 | Buy |
| TCI Chemical | M0491 | 3-Methyl-5-pyrazolone >98.0%(T) | 108-26-9 | 500g | $355 | 2026-04-30 | Buy |
| Usbiological | 283412 | 3-Methyl-2-pyrazolin-5-one Asreported | 108-26-9 | 100g | $418 | 2026-06-03 | Buy |
| Usbiological | 283412 | 3-Methyl-2-pyrazolin-5-one Asreported | 108-26-9 | 250g | $641 | 2026-06-03 | Buy |
| Usbiological | 283412 | 3-Methyl-2-pyrazolin-5-one Asreported | 108-26-9 | 500g | $914 | 2026-06-03 | Buy |
3-Methyl-2-pyrazolin-5-one Chemical Properties,Uses,Production
Chemical Properties
3-Methyl-2-pyrazolin-5-one is yellowish powder
Uses
3-Methyl-2-pyrazolin-5-one is used as intermediate for the manufacture of dyestuffs as well as for agrochemicals.
Uses
3-Methyl-2-pyrazolin-5-one is used in the preparation of spirocyclic [indole-3,4'-pyrano[2,3-c]pyrazole] by reacting with isatins and malonitrile in the presence of sodium bromide as electrolyte.
3-Methyl-2-pyrazolin-5-one Preparation Products And Raw materials
Raw materials
Preparation Products
CIBACRON BRILLIANT YELLOW 3G-P
disodium 2,5-dichloro-4-[4-[[5-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-2-sulphonatophenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonate
Acid yellow 11
Acid Red 215
Neutral Red 2gl
Acid Yellow 127
Reactive Light Yellow M-5G
Reactive Yellow 18
Acid yellow 76 (c.i. 18850)
PROCION YELLOW H-E3G
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Global( 300)Suppliers
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Yancheng Yuntao Chemical Co., Ltd. | 13512592619 | 2838893166@qq.com | China | 103 | 58 |
| NINGBO JL NEW MATERIAL CO.,LTD | 0574 88552216 18969899212 | sales@chematerials.cn | China | 1512 | 58 |
| Hangzhou Read Chemical Co., Ltd | 13599397867 15306818081 | sales@freemindpharm.com | China | 126 | 58 |
| Creasyn Finechem(Tianjin) Co., Ltd. | 022-83946278 13820372920 | sales@creasyn.com | China | 968 | 68 |
| J & K SCIENTIFIC LTD. | 18210857532 18210857532 | jkinfo@jkchemical.com | China | 96815 | 76 |
| Alfa Aesar | 400-6106006 | saleschina@alfa-asia.com | China | 30103 | 84 |
| TCI (Shanghai) Development Co., Ltd. | 021-67121386 | Sales-CN@TCIchemicals.com | China | 24512 | 81 |
| Energy Chemical | 400-0056266 | sales8178@energy-chemical.com | China | 44850 | 61 |
| Beijing Ouhe Technology Co., Ltd | 13552068683 13522913783 | 2355560935@qq.com | China | 11777 | 60 |
| JinYan Chemicals(ShangHai) Co.,Ltd. | 13817811078 | sales@jingyan-chemical.com | China | 9963 | 60 |
View Lastest Price from 3-Methyl-2-pyrazolin-5-one manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-09-02 | 3-methyl-2-pyrazolin-5-one
108-26-9
|
$3.00-10.00 | 1kg | 99% | Henan Fengda Chemical Co., Ltd | ||
 |
2019-07-06 | 3-Methyl-2-pyrazolin-5-one
108-26-9
|
$1.00 | 1kg | 98%min | Career Henan Chemical Co |
-
- 3-methyl-2-pyrazolin-5-one
108-26-9
- $3.00-10.00
- 99%
- Henan Fengda Chemical Co., Ltd
-
- 3-Methyl-2-pyrazolin-5-one
108-26-9
- $1.00
- 98%min
- Career Henan Chemical Co
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108-26-9
108-6-9
