4-Ethynyl-2-hydroxybenzaldehyde CAS 791068-99-0
| CAS No. | 791068-99-0 |
| Molecular Formula | C9H6O2 |
| Molecular Weight | 146.14 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.
CATO supplies 4-Ethynyl-2-hydroxybenzaldehyde (CAS 791068-99-0), a certified reference material (molecular formula C9H6O2, MW 146.14 g/mol) for analytical method development and quality control.
Structurally, 4-Ethynyl-2-hydroxybenzaldehyde (C9H6O2) contains a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. 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 146.14 g/mol, it falls into the low-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).
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C9H6O2 |
| Molecular Weight | 146.14 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1986 |
Related Ethynyl Standards
- 3-Ethynyl-2-hydroxybenzaldehyde (CAS 910459-12-0)
- 3-Ethynyl-5-hydroxybenzaldehyde (CAS 871345-34-5)
- 4-Ethynyl-1,3-dioxaindane (CAS 369363-94-0)
- 3-Ethynyl-5-fluoropicolinonitrile (CAS 1824167-99-8)
- 2-Ethynyl-1-methoxy-4-methylbenzene (CAS 104971-07-5)
- 1-Ethynyl-3-(methoxymethyl)benzene (CAS 1339108-03-0)
- (4-Ethynyl-3-methylphenyl)methanol (CAS 1357281-70-9)
- 1-Ethynyl-2-methoxy-4-methylbenzene (CAS 1572960-03-2)
Recommended Standards
- 4-Fluorothiophene-2-carboxylic Acid (CAS 32431-72-4)
- 4,5-Dihydroxy-1,3-dimethylimidazolidin-2-one (CAS 3923-79-3)
- 4-Fluorothiophene-3-carboxylic acid (CAS 78071-32-6)
- 4-(hydroxymethyl)-1H-imidazole-5-carboxylic acid (CAS 215523-33-4)
- 4-chloro-6-phenoxyquinoline (CAS 769952-75-2)
- 4-(piperidin-4-yl)quinoline dihydrochloride (CAS 1864063-43-3)
- 5-Methoxy-2-(4-(4-methoxyphenyl)-1H-pyrazol-3-yl)phenol (CAS 948901-10-8)
- 3-(2-Bromo-4-fluorobenzyl)azetidin-3-ol (CAS 1486907-75-8)
- Finerenone Impurity 246 (CAS CATO-C4X-2880246)
- Mesalamine EP Impurity O Sodium Salt Hydrate (CAS 1355342-86-7)
- 2-Hydroxy-2-phenylpropanoic acid hemihydrate (CAS 75378-83-5)
- 1-(2,6-Dichloro-4-(trifluoromethyl)phenyl)-1H-pyrazol-5(4H)-one (CAS 104924-84-7)
- Flurbiprofen Impurity 58 (CAS CATO-C4X-144458)
- Semaglutide impurity 72 (CAS CATO-C4X-222672)
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