(3-Formyl-5-nitrothiophen-2-yl)boronic acid CAS 21157-02-8
| CAS No. | 21157-02-8 |
| Molecular Formula | C5H4BNO5S |
| Molecular Weight | 200.96 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
(3-Formyl-5-nitrothiophen-2-yl)boronic acid (CAS 21157-02-8), molecular formula C5H4BNO5S and molecular weight 200.96 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, (3-Formyl-5-nitrothiophen-2-yl)boronic acid (C5H4BNO5S) contains a carbohydrate-derived structure, an amide group, a sulfone group. The molecule exhibits a degree of unsaturation (DBE) of 4.5, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 200.96 g/mol, it falls into the medium-molecular-weight range. 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).
As a certified reference material (CRM), (3-Formyl-5-nitrothiophen-2-yl)boronic acid 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 | C5H4BNO5S |
| Molecular Weight | 200.96 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 4.5 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1963 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
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Recommended Standards
- 4-(Aminocarbonyl)-3,5-difluorophenylboronic acid (CAS 924279-82-3)
- 4-Bromo-4,4-difluorobut-2-enoic acid (CAS 234096-26-5)
- 2,5-dichlorothiophen-3-ylboronic acid (CAS 177735-28-3)
- 2,4-bis(chloranyl)-1,3,5-tris(fluoranyl)benzene 2,4-dichloro-1,3,5-trifluorobenzene 2368-53-8 A816846 (CAS 2368-53-8)
- (1-Ethyl-1H-pyrrol-2-yl)methanethiol (CAS 1420967-06-1)
- (S)-3-(4-Cyclopropyl-2,5-dioxoimidazolidin-4-yl)propanoic acid (CAS 1957283-54-3)
- 4-Oxo-3-phenyl-2-sulfanyl-3,4-dihydroquinazoline-7-carboxylic acid (CAS 379245-45-1)
- 4-(2-Chloroethoxy)-3-methoxybenzonitrile (CAS 1094313-50-4)
- 6-Bromo-4-chloro-2,3-difluorobenzoic acid (CAS 2414146-36-2)
- 2-[5-(2-methylpropyl)-4-oxo-3h,4h-thieno[2,3-d]pyrimidin-2-yl]acetonitrile (CAS 926208-72-2)
- 1-Bromo-4-(ethylsulfonyl)butane (CAS 343269-12-5)
- Ethyl 2-(1-Benzylpiperidin-4-ylidene)acetate (CAS 40110-55-2)
- 1-[(1H-Pyrazol-1-yl)methyl]cyclopentan-1-ol (CAS 1464933-65-0)
- Semaglutide impurity 257 (CAS CATO-C4X-2226257)
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