4-Hydroxy-6-methylquinoline-3-carboxylic acid CAS 35973-18-3
| CAS No. | 35973-18-3 |
| Molecular Formula | C11H9NO3 |
| Molecular Weight | 203.19 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-Hydroxy-6-methylquinoline-3-carboxylic acid (CAS 35973-18-3), molecular formula C11H9NO3 and molecular weight 203.19 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C11H9NO3, 4-Hydroxy-6-methylquinoline-3-carboxylic acid contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 203.19 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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 | C11H9NO3 |
| Molecular Weight | 203.19 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >95% |
| 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.) | 1967 |
| Nitrogen Atoms | 1 |
Related Hydroxy Standards
- 2-hydroxy-7-methylquinoline-3-carboxylic acid (CAS 101133-49-7)
- 2-Hydroxy-7-methoxyquinoline-3-carboxaldehyde (CAS 101382-55-2)
- 7-Hydroxy-2-methylquinoline-3-carboxylic acid (CAS 103853-86-7)
- 8-Hydroxy-2-methylquinoline-5-carboxylic acid (CAS 103853-87-8)
- 4-Hydroxy-3-nitrobenzene acetic acid (CAS 10463-20-4)
- 2-Hydroxy-8-methoxyquinoline-3-carbaldehyde (CAS 112584-01-7)
- N-Hydroxy-N-phenylfuran-3-carboxamide (CAS 1137-48-0)
- 1-Acetyl-3-hydroxy-1H-indole-2-carbaldehyde (CAS 133593-40-5)
Recommended Standards
- 4-Hydroxy-5-methylquinoline-2-carboxylic acid (CAS 36303-31-8)
- 4-Hydroxy-7-methylquinoline-3-carboxylic Acid (CAS 256923-25-8)
- 4-Hydroxy-2-methylquinoline-8-carboxylic acid (CAS 672280-74-9)
- 4-Hydroxy-8-methyl-2-oxo-1,2-dihydroquinoline-3-carbaldehyde (CAS 291518-16-6)
- (+/-)-2-(P-Methoxyphenoxy)propionic acid (CAS 150436-68-3)
- Di-tert-butyl phthalate (CAS 30448-43-2)
- n-(Furan-2-ylmethyl)-1-(3-methylthiophen-2-yl)ethan-1-amine (CAS 1342418-43-2)
- rac-tert-butyl (3R,4S)-4-(1,5-dimethyl-1H-pyrazol-4-yl)pyrrolidine-3-carboxylate (CAS 1969288-55-8)
- Methyl 3-[3-chloro-5-(trifluoromethyl)-2-pyridinyl]-5-methyl-4-isoxazolecarboxylate (CAS 303997-60-6)
- N-Carbamoyl-2-(triphenylphosphoranylidene)acetamide (CAS 53296-08-5)
- 3-[bis(2-methoxyethyl)sulfamoyl]benzoic acid (CAS 445298-45-3)
- 1-Iodopentane-5,5,5-d3 (stabilized with copper) (CAS 920502-31-4)
- Ac-Ile-Tyr-Gly-Glu-Phe-NH2 (CAS 168781-78-0)
- Semaglutide Impurity 16 (CAS CATO-C4X-222616)
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