Methyl 4-oxo-3-phenyl-3,4-dihydrophthalazine-1-carboxylate CAS 16015-51-3
| CAS No. | 16015-51-3 |
| Molecular Formula | C16H12N2O3 |
| Molecular Weight | 280.28 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Methyl 4-oxo-3-phenyl-3,4-dihydrophthalazine-1-carboxylate (CAS 16015-51-3), molecular formula C16H12N2O3 and molecular weight 280.28 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, Methyl 4-oxo-3-phenyl-3,4-dihydrophthalazine-1-carboxylate is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 280.28 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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 | C16H12N2O3 |
| Molecular Weight | 280.28 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 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) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1961 |
| Nitrogen Atoms | 2 |
Recommended Standards
- 4-Oxo-3-(m-tolyl)-3,4-dihydrophthalazine-1-carboxylic acid (CAS 16015-50-2)
- 3-[(E)-2-[(2-Hydroxyphenyl)methylidene]hydrazin-1-yl]-1,2-dihydroquinoxalin-2-one (CAS 163402-50-4)
- 3-Benzyl-4-oxo-3,4-dihydrophthalazine-1-carboxylic acid (CAS 16015-49-9)
- 7-Methyl-8-oxo-5-phenyl-7,8-dihydro-1,7-naphthyridine-6-carboxylic acid (CAS 168542-35-6)
- 5,6-Dimethoxy-2-methyl-1H-indole (CAS 57330-45-7)
- Ethyl 2-butoxycyclopropane-1-carboxylate (CAS 78932-45-3)
- 7,7'-Dimethoxy-2,2',3,3'-tetrahydro-1,1'-spirobi[indene] (CAS 223137-81-3)
- 4-Chloro-5,7-dihydrofuro[3,4-d]pyrimidine (CAS 1379179-87-9)
- 4-Chloro-3,5-dimethoxybenzoic acid (CAS 56518-46-8)
- 4-(Pyridin-4-yl)-1H-imidazol-2-amine (CAS 103851-74-7)
- 6-Bromo-1H-pyrrolo[2,3-b]pyridine-1-carboxamide (CAS 1542067-90-2)
- 2-Ethoxy-6-methylpyridin-4-amine (CAS 197163-57-8)
- 3,4-Difluoro-2-ethoxyphenol (CAS 2271443-09-3)
- Semaglutide impurity 289 (CAS CATO-C4X-2226289)
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