6-Oxo-1-phenyl-1,4,5,6-tetrahydropyridazine-3-carboxylic acid CAS 33548-33-3
| CAS No. | 33548-33-3 |
| Molecular Formula | C11H10N2O3 |
| Molecular Weight | 218.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
6-Oxo-1-phenyl-1,4,5,6-tetrahydropyridazine-3-carboxylic acid (CAS 33548-33-3) is a high-purity analytical reference standard with the molecular formula C11H10N2O3 and a molecular weight of 218.21 g/mol.
Owing to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage, 6-Oxo-1-phenyl-1,4,5,6-tetrahydropyridazine-3-carboxylic acid is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 218.21 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
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 | C11H10N2O3 |
| Molecular Weight | 218.21 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1966 |
| Nitrogen Atoms | 2 |
Recommended Standards
- 6-Methyl-4-oxo-4H-pyrido[1,2-a]pyrimidine-2-carboxylic acid methyl ester (CAS 2122461-94-1)
- 7-(2-Oxopropoxy)-2H-chromen-2-one (CAS 36914-75-7)
- 6-Ethyl-4-oxo-4H-chromene-2-carboxylic acid (CAS 5527-91-3)
- 7-(Dimethoxymethyl)pyrazolo[1,5-a]pyrimidine-3-carbonitrile (CAS 478046-33-2)
- 3-[5-chloro-1-(2,6-dichlorobenzyl)-3-methyl-1H-pyrazol-4-yl]acrylic acid (CAS 1006441-66-2)
- 2-(2-Methoxyphenyl)piperidine-1-carbaldehyde (CAS 1355225-64-7)
- (6-((tert-Butyldimethylsilyl)oxy)-2,5,7,8-tetramethylchroman-2-yl)methanol (CAS 228114-44-1)
- Methylsilane (CAS 992-94-9)
- 7-Methylimidazo[1,2-a]pyridin-6-amine (CAS 1215984-92-1)
- Diethyl 2-Acetamido-2-(2-oxopropyl)malonate (CAS 82518-90-9)
- n-Butyl-3-methylaniline (CAS 60995-75-7)
- 5-Benzyl-7-iodoquinolin-8-ol (CAS 92867-75-9)
- 1-(3-Amino-propionyl)-pyrrolidin-3-ol hydrochloride (CAS 1220181-17-8)
- Semaglutide impurity 66 (CAS CATO-C4X-222666)
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