5-Nitrobenzofuran-2(3H)-one CAS 21997-23-9
| CAS No. | 21997-23-9 |
| Molecular Formula | C8H5NO4 |
| Molecular Weight | 179.13 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Structurally, 5-Nitrobenzofuran-2(3H)-one (C8H5NO4) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 7.0, corresponding to approximately 7 ring(s) or double-bond equivalent(s). With a molecular weight of 179.13 g/mol, it falls into the medium-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
5-Nitrobenzofuran-2(3H)-one (CAS 21997-23-9) is a high-purity analytical reference standard with the molecular formula C8H5NO4 and a molecular weight of 179.13 g/mol.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 5-Nitrobenzofuran-2(3H)-one 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.
Physical & Chemical Properties
| Molecular Formula | C8H5NO4 |
| Molecular Weight | 179.13 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (faint amine-like odor) |
| 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1963 |
| Nitrogen Atoms | 1 |
Related Nitrobenzofuran Standards
- 6-Nitrobenzofuran-3(2H)-one (CAS 1199783-01-1)
- 4-Nitrobenzofuran-3(2H)-one (CAS 1199783-06-6)
- 3-Nitrobenzofuran-5-ol (CAS 126318-27-2)
- 7-Nitrobenzofuran-5-ol (CAS 1384895-50-4)
- 2-Nitrobenzofuran-4-ol (CAS 40024-31-5)
- 2-Nitrobenzofuran-6-ol (CAS 40739-72-8)
- 2-Nitrobenzofuran-7-ol (CAS 40739-73-9)
- 5-Nitrobenzofuran-3(2H)-one (CAS 25158-68-3)
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