4-{[(3,5-dichlorophenyl)amino]methylidene}-3-methyl-4,5-dihydro-1H-pyrazol-5-one CAS 338975-43-2
| CAS No. | 338975-43-2 |
| Molecular Formula | C11H9Cl2N3O |
| Molecular Weight | 270.11 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
4-{[(3,5-dichlorophenyl)amino]methylidene}-3-methyl-4,5-dihydro-1H-pyrazol-5-one (CAS 338975-43-2), molecular formula C11H9Cl2N3O and molecular weight 270.11 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C11H9Cl2N3O, 4-{[(3,5-dichlorophenyl)amino]methylidene}-3-methyl-4,5-dihydro-1H-pyrazol-5-one contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 270.11 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
As a certified reference material (CRM), 4-{[(3,5-dichlorophenyl)amino]methylidene}-3-methyl-4,5-dihydro-1H-pyrazol-5-one meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C11H9Cl2N3O |
| Molecular Weight | 270.11 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 3 |
Related dichlorophenyl Standards
- Methyl 4-(3,4-dichlorophenyl)-1H-pyrrole-3-carboxylate (CAS 103999-52-6)
- Methyl 4-(2,3-dichlorophenyl)-1H-pyrrole-3-carboxylate (CAS 103999-57-1)
- 2-(2,4-Dichlorophenyl)-N-(1h-pyrazol-4-yl)acetamide (CAS 1154953-36-2)
- 1-(3-(2,4-Dichlorophenyl)-5-methylisoxazol-4-yl)ethanone (CAS 169814-56-6)
- 1-(1-(2,3-Dichlorophenyl)-5-methyl-1H-1,2,3-triazol-4-yl)ethan-1-one (CAS 519056-56-5)
- 1-(1-(3,5-Dichlorophenyl)-5-methyl-1H-1,2,3-triazol-4-yl)ethanone (CAS 667865-24-9)
- 1-(3-(2,3-Dichlorophenyl)-5-methylisoxazol-4-yl)ethanone (CAS 266679-19-0)
- 1-(3-(2,6-Dichlorophenyl)-5-methylisoxazol-4-yl)ethan-1-one (CAS 70565-23-0)
Recommended Standards
- 4,6-Dichloro-n-(4-methoxyphenyl)pyrimidin-2-amine (CAS 335649-13-3)
- Ethyl (Z)-2-cyano-3-(3,4-dichlorophenyl)acrylate (CAS 55417-50-0)
- 3-Iodo-2,4,5,6-tetrahydro-1H-cyclobuta[f]indene (CAS 2271393-82-7)
- Ethyl 2,4-dichloroquinoline-3-carboxylate (CAS 6315-94-2)
- 4-Phenyl-4-Pentenoic Acid (CAS 5747-06-8)
- 1-((3-Chloro-5-(trifluoromethyl)pyridin-2-yl)amino)-3-cyanopropan-2-yl 2,4-dichlorobenzoate (CAS 339016-48-7)
- (S)-5,8a-Dimethyl-3,4,8,8a-tetrahydro-2H,7H-naphthalene-1,6-dione (CAS 41722-49-0)
- tert-butyl N-(1-carbamothioylpiperidin-4-yl)carbamate (CAS 848498-90-8)
- Terbinafine Impurity N2 (CAS 99473-15-1)
- (2Z)-N-(2,4-Dimethoxyphenyl)-3-(naphthalen-1-yl)prop-2-enamide (CAS 329779-55-7)
- 2-(3-Acetyl-2-methyl-5-phenyl-1H-pyrrol-1-yl)acetic acid (CAS 396123-23-2)
- 5-(((2-Cyanoethyl)thio)methyl)furan-2-carboxylic acid (CAS 90564-11-7)
- 1-(2-Fluorophenyl)-1h,4h,5h-pyrazolo[3,4-d]pyrimidin-4-one (CAS 630107-82-3)
- Semaglutide Impurity 5 (CAS 23406-82-8)
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