3-(4-(p-Tolyloxy)phenyl)-5-methylisoxazole-4-carboxylic Acid CAS 1159981-29-9
| CAS No. | 1159981-29-9 |
| Molecular Formula | C18H15NO4 |
| Molecular Weight | 309.32 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
3-(4-(p-Tolyloxy)phenyl)-5-methylisoxazole-4-carboxylic Acid (CAS 1159981-29-9) is a high-purity analytical reference standard with the molecular formula C18H15NO4 and a molecular weight of 309.32 g/mol.
3-(4-(p-Tolyloxy)phenyl)-5-methylisoxazole-4-carboxylic Acid (C18H15NO4) contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage. The carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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).
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.
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 | C18H15NO4 |
| Molecular Weight | 309.32 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, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1989 |
| Nitrogen Atoms | 1 |
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Recommended Standards
- 4-(5-((3-Fluorophenyl)carbamoyl)-1,3,4-thiadiazol-2-yl)butanoic acid (CAS 1142202-89-8)
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- 2,4,6-Trichloro-5-iodopyrimidine (CAS 1137576-61-4)
- 7-Methoxy-2-(4-methoxyphenyl)quinoline-4-carboxylic acid (CAS 116734-20-4)
- 16-((2,5-Dioxopyrrolidin-1-yl)oxy)-16-oxohexadecanoic acid (CAS 146004-83-3)
- 1,4,5,8-Tetraamino-2,7-dipropoxyanthracene-9,10-dione (CAS 88601-64-3)
- 2-(1-Methylpyrrolidin-2-ylidene)malononitrile (CAS 53583-60-1)
- N-(6-Amino-2,4-dioxo-3-propyl-1,2,3,4-tetrahydropyrimidin-5-yl)cyclopentanecarboxamide (CAS 152529-70-9)
- beta-Farnesene (CAS 28973-97-9)
- N'-(3-bromo-4-methylbenzylidene)-4-methylbenzenesulfonohydrazide (CAS 2432854-98-1)
- 1-(Dibromomethyl)adamantane (CAS 54808-00-3)
- Raloxifene Impurity 4 (CAS 1191901-07-1)
- tert-Butyl 3-formyl-4-methylpiperidine-1-carboxylate (CAS 1201187-01-0)
- Tirzepatide Impurity 9 (CAS CATO-C4X-32409)
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