CAS 137-44-0: 5-Pyrazolone
Description:5-Pyrazolone, with the CAS number 137-44-0, is an organic compound characterized by its five-membered ring structure containing two nitrogen atoms. It is a derivative of pyrazole and is known for its keto-enol tautomerism, where it can exist in both keto and enol forms. This compound typically appears as a white to pale yellow crystalline solid and is soluble in polar solvents like water and alcohols. 5-Pyrazolone exhibits various chemical properties, including the ability to form complexes with metal ions, which makes it useful in analytical chemistry and as a reagent in various organic synthesis reactions. Additionally, it has applications in the pharmaceutical industry, particularly in the development of analgesics and anti-inflammatory agents. The compound's reactivity is influenced by the presence of functional groups, allowing for further derivatization. Safety data indicates that it should be handled with care, as it may pose health risks upon exposure. Overall, 5-Pyrazolone is a versatile compound with significant relevance in both research and industrial applications.
Formula:C3H4N2O
InChI:InChI=1S/C3H4N2O/c6-3-1-2-4-5-3/h2H,1H2,(H,5,6)
InChI key:InChIKey=ZRHUHDUEXWHZMA-UHFFFAOYSA-N
SMILES:O=C1NN=CC1
- Synonyms:
- 1,4-Dihydropyrazol-5-one
- 1H-Pyrazol-5(4H)-one
- 2,4-dihydro-3H-pyrazol-3-one
- 2-Pyrazolin-5-one
- 3H-Pyrazol-3-one, 2,4-dihydro-
- NSC 243823
- 5-Pyrazolone
Brand | Product data | Purity | Price range | Estimated delivery |
---|---|---|---|---|
![]() | 3H-Pyrazol-3-one, 2,4-dihydro- REF: IN-DA0012O9CAS: 137-44-0 | 95% | 24.00 €~471.00 € | Tue 11 Mar 25 |
![]() | 1H-pyrazol-5(4H)-one REF: 54-OR79427CAS: 137-44-0 | 98+% | 96.00 €~352.00 € | Wed 12 Mar 25 |
![]() | 5-Pyrazolone REF: 3B-P2563CAS: 137-44-0 | >98.0%(GC) | 31.00 €~77.00 € | Fri 14 Mar 25 |
![]() | 2H-Pyrazol-3-ol REF: 10-F316704CAS: 137-44-0 | 95.0% | To inquire | Fri 21 Mar 25 |
![]() | 1H-Pyrazol-5(4H)-one REF: 10-F319033CAS: 137-44-0 | 95.0% | To inquire | Fri 21 Mar 25 |
![]() | 1H-Pyrazol-5(4H)-one REF: 3D-FP140882CAS: 137-44-0 | Min. 95% | - - - | Discontinued product |

3H-Pyrazol-3-one, 2,4-dihydro-
Ref: IN-DA0012O9
1g | 36.00 € | ||
5g | 93.00 € | ||
10g | 102.00 € | ||
25g | 145.00 € | ||
250mg | 24.00 € |

5-Pyrazolone
Ref: 3B-P2563
1g | 77.00 € | ||
200mg | 31.00 € |

Ref: 10-F316704
1g | To inquire | ||
5g | 53.00 € | ||
10g | 98.00 € | ||
25g | 186.00 € | ||
100g | 460.00 € | ||
250mg | To inquire |

1H-Pyrazol-5(4H)-one
Ref: 10-F319033
1g | 20.00 € | ||
5g | 31.00 € | ||
10g | 60.00 € | ||
25g | 134.00 € |

1H-Pyrazol-5(4H)-one
Ref: 3D-FP140882
1g | Discontinued | Request information | |
2g | Discontinued | Request information | |
100mg | Discontinued | Request information | |
250mg | Discontinued | Request information | |
500mg | Discontinued | Request information |