3,4-Dichloro-1-(p-tolyl)-1H-pyrrole-2,5-dione CAS 29244-55-1
| CAS No. | 29244-55-1 |
| Molecular Formula | C11H7Cl2NO2 |
| Molecular Weight | 256.08 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 3,4-Dichloro-1-(p-tolyl)-1H-pyrrole-2,5-dione 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.
3,4-Dichloro-1-(p-tolyl)-1H-pyrrole-2,5-dione (CAS 29244-55-1), molecular formula C11H7Cl2NO2 and molecular weight 256.08 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, chlorine substitution, 3,4-Dichloro-1-(p-tolyl)-1H-pyrrole-2,5-dione is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 256.08 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
Physical & Chemical Properties
| Molecular Formula | C11H7Cl2NO2 |
| Molecular Weight | 256.08 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1965 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
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- Lisinopril Dihydrate EP Impurity G (CAS CATO-C4X-168132)
- 4-(4-Chlorophenyl)-5-(3-methoxyphenyl)-4h-1,2,4-triazole-3-thiol (CAS 731826-99-6)
- 1-Methoxy-4-(1-phenylvinyl)benzene (CAS 4333-75-9)
- 3-(Butylthio)-5-propyl-4h-1,2,4-triazol-4-amine (CAS 449746-07-0)
- 4,4,4-Trifluoro-3,3-bis(trifluoromethyl)but-1-yne (CAS 14115-48-1)
- Semaglutide Impurity 188 (CAS CATO-C4X-2226188)
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