4-Ethynylphthalic acid CAS 87639-56-3
| CAS No. | 87639-56-3 |
| Molecular Formula | C10H6O4 |
| Molecular Weight | 190.15 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-Ethynylphthalic acid (CAS 87639-56-3), molecular formula C10H6O4 and molecular weight 190.15 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 4-Ethynylphthalic acid (C10H6O4) is characterized by a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. In reversed-phase chromatography, its retention is governed primarily by its high hydrophobicity (logP), which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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.
CATO manufactures 4-Ethynylphthalic 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 | C10H6O4 |
| Molecular Weight | 190.15 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, 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.) | 1982 |
Recommended Standards
- 4,4-Difluoro-3-(1H-imidazol-1-yl)butanoic acid (CAS 2138353-85-0)
- 4-Hydroxy-2-ketopimelic Acid Sodium SaltDISCONTINUED (CAS 53795-98-5)
- 4-(2-(Methoxycarbonyl)hydrazinyl)-4-oxobutanoic acid (CAS 327065-40-7)
- 4-Hydroxy-2-oxo-2H-chromene-3-carbaldehyde (CAS 51751-34-9)
- 2-[2-methyl-5-(trifluoromethoxy)-1h-indol-3-yl]ethan-1-amine hydrochloride (CAS 1135279-92-3)
- 1-Cyclobutylcyclopropanecarbonitrile (CAS 1874070-43-5)
- 1-Cyclopropylprop-2-yn-1-amine hydrochloride (CAS 2241053-20-1)
- 6-Fluoro-1,4-dioxa-8-azaspiro[4.5]decane (CAS 1612175-96-8)
- 2-Chloro-5-(m-tolyl)oxazole (CAS 1896831-63-2)
- 3-Aminobenzofuran-2-carboxylic acid (CAS 742013-09-8)
- Benzyl ((S)-1-(((S)-1-amino-4-methyl-1-oxopentan-2-yl)amino)-3-(1H-indol-3-yl)-1-oxopropan-2-yl)carbamate (CAS 6416-79-1)
- tert-Butyl 2-(4-bromo-1H-pyrazol-1-yl)acetate (CAS 1199773-67-5)
- (S,RS)-AHPC-PEG4-acid (CAS 2172820-12-9)
- Des-Ile12-Aib13-Tirzepatide (CAS CATO-CPTD788960)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com