5-(4-methylphenyl)-4,5-dihydroisoxazole-3-carboxylic acid CAS 1018170-48-3
| CAS No. | 1018170-48-3 |
| Molecular Formula | C11H11NO3 |
| Molecular Weight | 205.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 5-(4-methylphenyl)-4,5-dihydroisoxazole-3-carboxylic acid.
5-(4-methylphenyl)-4,5-dihydroisoxazole-3-carboxylic acid (CAS 1018170-48-3), molecular formula C11H11NO3 and molecular weight 205.21 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C11H11NO3, 5-(4-methylphenyl)-4,5-dihydroisoxazole-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 205.21 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C11H11NO3 |
| Molecular Weight | 205.21 g/mol |
| Appearance | Off-white to pale 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1988 |
| Nitrogen Atoms | 1 |
Related methylphenyl Standards
- 3-(3-Methylphenyl)-4,5-dihydro-1,2-oxazole-5-carboxylic acid (CAS 1038376-42-9)
- 3-(4-Methylphenyl)-4,5-dihydro-1,2-oxazole-5-carboxylic acid (CAS 569672-90-8)
- 4-Methyl-5-(4-methylphenyl)-4h-1,2,4-triazol-3-yl hydrosulfide (CAS 138417-37-5)
- 5-Methyl-4-(4-methylphenyl)-4H-1,2,4-triazol-3-yl hydrosulfide (CAS 149747-23-9)
- 4-Methyl-5-(2-methylphenyl)-4H-1,2,4-triazole-3-thiol (CAS 174574-08-4)
- 1-Methyl-4-(4-methylphenyl)-4,5-dihydro-1H-1,2,4-triazole-5-thione (CAS 478247-44-8)
- 2-(4-Methylphenyl)-4-thiazolemethanol (CAS 36093-97-7)
- 3-{[(4-methylphenyl)methyl]sulfanyl}-1h-1,2,4-triazole (CAS 302804-66-6)
Recommended Standards
- 2-(4-Acetyl-2-methoxyphenoxy)acetonitrile (CAS 1016853-34-1)
- 2-(2-Methylindolin-1-yl)-2-oxoacetic acid (CAS 1018295-36-7)
- 5-[(3-methoxyphenyl)methyl]-1,3,4-oxadiazol-2-amine (CAS 1016691-89-6)
- 2-(3,4-Dihydroquinolin-1(2H)-yl)-2-oxoacetic acid (CAS 1018565-99-5)
- 4-(Difluoromethyl)-2,5-difluorobenzamide (CAS 1806362-43-5)
- 6-Formamidopenicillanic Acid (CAS 64527-04-4)
- 2-Methyl-1-[2-(trifluoromethyl)benzoyl]piperazine (CAS 1240565-74-5)
- 1-(Phenylmethyl) (3S)-3-carboxy-8-imino-10-oxo-12-phenyl-11-oxa-2,7,9-triazadodecanoate (CAS 53934-75-1)
- Revefenacin Impurity 10 (CAS 743460-48-2)
- {2-[(4-chlorophenyl)methyl]-1,3-thiazol-4-yl}methanamine dihydrochloride (CAS 1989672-64-1)
- tert-Butyl 4-(2-chloropyrimidin-4-yl)-2-methylpiperazine-1-carboxylate (CAS 1261230-38-9)
- (E)-Methyl 5-hydroxypent-3-enoate (CAS 83606-26-2)
- 4-Fluorobenzo[d]thiazole-2-carboxylic acid (CAS 479028-70-1)
- Custom peptides (CAS CATO-CPTD788509)
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