4,5-Dihydro-1H-pyrazole-5-carboxylic acid CAS 78367-79-0
| CAS No. | 78367-79-0 |
| Molecular Formula | C4H6N2O2 |
| Molecular Weight | 114.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 4,5-Dihydro-1H-pyrazole-5-carboxylic acid is closely related to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
4,5-Dihydro-1H-pyrazole-5-carboxylic acid (CAS 78367-79-0) is a high-purity analytical reference standard with the molecular formula C4H6N2O2 and a molecular weight of 114.10 g/mol.
4,5-Dihydro-1H-pyrazole-5-carboxylic acid (C4H6N2O2) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C4H6N2O2 |
| Molecular Weight | 114.10 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1979 |
| Nitrogen Atoms | 2 |
Related Dihydro Standards
- Dihydro-2H-pyran-2,3(4H)-dione (CAS 154064-57-0)
- 5,6-Dihydro-1,4-dioxine-2-carbaldehyde (CAS 59518-69-3)
- Dihydro-2H-pyran-2,4(3H)-dione (CAS 33532-46-6)
- 1-Ethyl-1,4-dihydro-5H-tetrazol-5-one (CAS 69048-98-2)
- 5-Oxo-4,5-dihydro-1,3,4-oxadiazole-2-carbaldehyde (CAS 1357567-93-1)
- (3,6-dihydro-2H-pyran-4-yl)methanol (CAS 14774-34-6)
- (5,6-Dihydro-2h-pyran-3-yl)methanol (CAS 14774-35-7)
- (3,6-Dihydro-2H-pyran-2-yl)methanol (CAS 1504-04-7)
Recommended Standards
- 4-(Hydroxymethyl)furan-2(5h)-one (CAS 80904-75-2)
- 4,5-Dihydrofuran-2-carboxylic acid (CAS 444777-27-9)
- 3-Oxocyclobutanecarboxylic Acid (CAS 23761-23-1)
- 4,5-Dihydrofuran-3-carboxylic Acid (CAS 98021-62-6)
- 3-(2,2,3,3-Tetramethylcyclopropyl)isoxazol-5-amine (CAS 1520954-44-2)
- 4-(3,4-Difluoro-benzenesulfonylamino)-benzoic acid (CAS 327072-97-9)
- 5-Amino-1-(4-ethoxyphenyl)-1h-1,2,3-triazole-4-carboxamide (CAS 929826-74-4)
- Methyl 5-(2,3-difluorophenyl)nicotinate (CAS 1261663-40-4)
- (S)-5-Vinyloxazolidine-2-thione (CAS 500-12-9)
- 5-amino-4-methyl-1-phenyl-1H-pyrazole-3-carbonitrile (CAS 1414570-18-5)
- Enarodustat Impurity 32 (CAS CATO-C4X-322832)
- 2-(4-Amino-1-hydroxycyclohexyl)acetic acid (CAS 1519459-85-8)
- 1,3-Dichloro-6,7-dimethoxyisoquinoline (CAS 24623-42-5)
- Semaglutide impurity 268 (CAS CATO-C4X-2226268)
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