3-Ethynyl-5-nitrobenzoic acid CAS 1639866-71-9
| CAS No. | 1639866-71-9 |
| Molecular Formula | C9H5NO4 |
| Molecular Weight | 191.14 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 191.14 g/mol gives 3-Ethynyl-5-nitrobenzoic acid distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
3-Ethynyl-5-nitrobenzoic acid (CAS 1639866-71-9) is a high-purity analytical reference standard with the molecular formula C9H5NO4 and a molecular weight of 191.14 g/mol.
The molecular framework of 3-Ethynyl-5-nitrobenzoic acid (C9H5NO4) is characterized by an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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.
CATO manufactures 3-Ethynyl-5-nitrobenzoic acid under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C9H5NO4 |
| Molecular Weight | 191.14 g/mol |
| Appearance | Pale yellow to 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1993 |
| Nitrogen Atoms | 1 |
Related Ethynyl Standards
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Recommended Standards
- 3-(4-Nitrophenyl)-1,2,4-oxadiazole (CAS 16013-14-2)
- 3-Amino-1-(2,2-difluoroethyl)-1H-pyrazole-4-carboxylic acid (CAS 1791389-33-7)
- 5-(difluoromethoxy)-1-methyl-1H-pyrazole-3-carboxamide (CAS 149978-50-7)
- 6-Formylbenzo[d]oxazole-2-carboxylic acid (CAS 1803745-29-0)
- 5-Chloro-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride (CAS 1956324-98-3)
- 2-((2,2-Dimethoxyethyl)thio)-5-ethyl-6-(naphthalen-1-ylmethyl)pyrimidin-4-ol (CAS 199852-06-7)
- 1-Diphenylmethylazetidin-3-amine acetate (CAS 928672-57-5)
- Guanosine 5-Triphosphate Disodium Salt (CAS 56001-37-7)
- 2-[(4-Chlorophenyl)sulfanyl]-N-(5-methyl-1,2-oxazol-3-yl)acetamide (CAS 297150-00-6)
- 3-Bromo-5-chloro-4-nitropyridine (CAS 1335057-82-3)
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- Semaglutide impurity 194 (CAS CATO-C4X-2226194)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
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