4,6-Dimethyl-2-oxo-2H-pyran-3-carboxylic acid CAS 33953-26-3
| CAS No. | 33953-26-3 |
| Molecular Formula | C8H8O4 |
| Molecular Weight | 168.15 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system, 4,6-Dimethyl-2-oxo-2H-pyran-3-carboxylic acid is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 168.15 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
4,6-Dimethyl-2-oxo-2H-pyran-3-carboxylic acid (CAS 33953-26-3) is a high-purity analytical reference standard with the molecular formula C8H8O4 and a molecular weight of 168.15 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.
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 | C8H8O4 |
| Molecular Weight | 168.15 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1966 |
Related Dimethyl Standards
- 2,6-Dimethyl-3-nitropyridin-4(1H)-one (CAS 122957-45-3)
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Recommended Standards
- 4,6-Dimethoxypyrimidine-5-carbaldehyde (CAS 4558-59-2)
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- 4,5-Dimethoxy-1,2-benzoquinone (CAS 21086-65-7)
- 4,6-Dimethyl-3-nitropyridin-2(1H)-one (CAS 22934-13-0)
- 2-Methyl-2,3-dihydro-1H-quinolin-4-one (CAS 30448-37-4)
- 1-Phenyl-2-(piperazin-1-yl)ethan-1-ol dihydrochloride (CAS 685138-21-0)
- Methyl 5-Bromopyrrolo[2,3-b]pyridine-6-carboxylate (CAS 1408074-64-5)
- 3-(Thiophen-2-yl)-1,2,4-thiadiazol-5-amine (CAS 138613-72-6)
- Ethanone, 1-(5-methyl-1h-indazol-1-yl)- (CAS 343770-79-6)
- 1-(4-Chloro-3-nitrobenzenesulfonyl)piperidine-4-carboxylic acid (CAS 368427-83-2)
- HDAC-IN-4, 98% (CAS 934828-12-3)
- tert-Butyl 3-hydroxybenzoate (CAS 57704-54-8)
- 1-(4-Fluorophenyl)naphthalene (CAS 572-52-1)
- Liraglutide Impurity 15 TFA Salt (CAS CATO-C4X-199215)
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