4-(2,5-Dioxo-2,5-dihydropyrrol-1-yl)phthalic acid CAS 56896-91-4
| CAS No. | 56896-91-4 |
| Molecular Formula | C12H7NO6 |
| Molecular Weight | 261.19 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-(2,5-Dioxo-2,5-dihydropyrrol-1-yl)phthalic acid (CAS 56896-91-4), molecular formula C12H7NO6 and molecular weight 261.19 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 4-(2,5-Dioxo-2,5-dihydropyrrol-1-yl)phthalic acid (C12H7NO6) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 10.0, corresponding to approximately 10 ring(s) or double-bond equivalent(s). With a molecular weight of 261.19 g/mol, it falls into the medium-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C12H7NO6 |
| Molecular Weight | 261.19 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, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1973 |
| Nitrogen Atoms | 1 |
Related Dioxo Standards
- 5-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)benzene-1,3-dicarboxylic acid (CAS 55738-70-0)
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Recommended Standards
- 3-(4-Nitrobenzoyl)pyrimidine-2,4(1H,3H)-dione (CAS 90330-18-0)
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- 3-(2,4-Dinitrophenoxy)pyridine (CAS 40604-27-1)
- 2-(1H-Imidazole-2-carbonyl)-5-nitrobenzoic acid (CAS 62367-07-1)
- N-(2-Morpholinoethyl)-4,6-diphenylpyridazin-3-amine (CAS 118270-30-7)
- 4-((4-Chlorophenyl)sulfonyl)-3-methylthiophene-2-carbonyl chloride (CAS 175137-66-3)
- 3-Amino-4-morpholinopyridine (CAS 90648-26-3)
- tert-Butyl N-[(3R,4S)-4-hydroxypiperidin-3-yl]carbamate (CAS 1549812-78-3)
- 4,5-Dichloro-2-(p-tolyl)pyridazin-3(2h)-one (CAS 33098-21-4)
- 4-Bromo-2-fluoro-6-hydroxybenzoic acid (CAS 1805589-29-0)
- (5-(2,6-Difluorophenyl)-1,2,4-oxadiazol-3-yl)methanamine hydrochloride (CAS 1609395-83-6)
- 2280-89-9 A3PN1N22K1 5-Amino-2,4,6-triiodo-N-methylisophthalamic acid 3-Amino-2,4,6-triiodo-5-((methylamino)carbonyl)benzoic acid EINECS 218-917-1 EC 218-917-1 UNII-A3PN1N22K1 (CAS 2280-89-9)
- 6-chloro-3-methyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carbonitrile (CAS 1803604-63-8)
- Antifreeze Polypeptide 6 (winter flounder) trifluoroacetate salt (CAS 122604-16-4)
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