5-Isoxazolecarboxylic Acid Methyl Ester CAS 15055-81-9
| CAS No. | 15055-81-9 |
| Molecular Formula | C5H5NO3 |
| Molecular Weight | 127.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage, 5-Isoxazolecarboxylic Acid Methyl Ester is typically off-white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 127.10 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
5-Isoxazolecarboxylic Acid Methyl Ester (CAS 15055-81-9), molecular formula C5H5NO3 and molecular weight 127.10 g/mol, is a CATO reference standard with documented purity and traceability.
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 | C5H5NO3 |
| Molecular Weight | 127.10 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1961 |
| Nitrogen Atoms | 1 |
Related Isoxazolecarboxylic Standards
- 3-Isoxazolecarboxylic acid, methyl ester (CAS 25742-68-1)
- 5-Isoxazolecarboxylic acid hydrazide (CAS 855746-95-1)
- 5-Isoxazolecarboxylic Acid (CAS 21169-71-1)
- 5-acetyl-3-Isoxazolecarboxylic acid (CAS 145441-17-4)
- 133674-35-8 5-Isoxazolecarboxylic acid, 3-(1-methylethyl)-, methyl ester (9CI) (CAS 133674-35-8)
- 5-phenyl-3-isoxazolecarboxylic acid (CAS 14441-90-8)
- 3-Isoxazolecarboxylic acid, 4-phenyl-, ethyl ester (CAS 96129-46-3)
- 4-Isoxazolecarboxylic acid, 3-(5-fluoro-2-pyridinyl)-5-methyl-, ethyl ester (CAS 1159252-10-4)
Recommended Standards
- 5-Amino-1H-1,2,4-triazole-1-carboxamide (CAS 1489-02-7)
- 2-Aminofuran-3-carboxylic acid (CAS 1513644-20-6)
- 1-Aminopyrimidine-2,4(1H,3H)-dione (CAS 14493-37-9)
- Isoxazole-4-carboxylic acid methyl ester (CAS 15166-81-1)
- Ruthenium, dichlorobis(1,2-ethanediamine-N,N')-, chloride (CAS 41509-67-5)
- Methyl (2Z)-2-(benzenesulfonyl)-3-[(4-ethylphenyl)amino]prop-2-enoate (CAS 1327196-59-7)
- 1-[(4-Methoxybenzyl)oxy]-2-methylpropan-2-ol 1-[(4-Methoxyphenyl)methoxy]-2-methyl-2-propanol 154044-75-4 2-Methyl-1-(4-methoxyphenyl)methoxy-2-propanol (CAS 154044-75-4)
- Morinidazole Impurity N1 (CAS 1807608-29-2)
- 3-Bromo-4-(difluoromethyl)benzonitrile (CAS 1261476-24-7)
- 2-Amino-4-[benzyl(methyl)amino]-6-chloropyrimidine-5-carbaldehyde (CAS 142979-46-2)
- 6-Amino-2,2,4,4-tetramethylthiochroman (CAS 203856-19-3)
- 3-Cyclohexyl-5-methyl-1,2-oxazole-4-carboxylic acid (CAS 55278-64-3)
- Laricitrin 3-O-glucoside (CAS 39986-90-8)
- Neuropeptide Y, porcine (CAS 82785-45-3)
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