Methylisothiazole-5-carboxylate CAS 15901-66-3
| CAS No. | 15901-66-3 |
| Molecular Formula | C5H5NO2S |
| Molecular Weight | 143.16 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Methylisothiazole-5-carboxylate is closely related to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
Methylisothiazole-5-carboxylate (CAS 15901-66-3), molecular formula C5H5NO2S and molecular weight 143.16 g/mol, is a CATO reference standard with documented purity and traceability.
Methylisothiazole-5-carboxylate (C5H5NO2S) contains an amide group, a sulfone group, a carboxylic acid 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. 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.
As a certified reference material (CRM), Methylisothiazole-5-carboxylate meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C5H5NO2S |
| Molecular Weight | 143.16 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| 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) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1961 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Methylisothiazole Standards
- 5-Methylisothiazole-3-carboxylic acid (CAS 110632-59-2)
- 5-Methylisothiazole-4-carboxylic acid (CAS 1125409-67-7)
- 4-Methylisothiazole-3-carboxylic acid (CAS 1507952-32-0)
- 4-Methylisothiazole-5-carboxylic acid (CAS 15901-61-8)
- 3-Methylisothiazole-5-carboxylic acid (CAS 66975-83-5)
- 3-Methylisothiazole-4-carboxamide (CAS 1259065-61-6)
- Methyl 3-methylisothiazole-5-carboxylate (CAS 15901-54-9)
- Methyl 5-methylisothiazole-4-carboxylate (CAS 15901-70-9)
Recommended Standards
- 3-Methyl-isothiazole-4-carboxylic acid (CAS 15903-66-9)
- 1-(3-Fluoropropyl)-1h-pyrazol-4-amine (CAS 1532926-04-7)
- (5-Ethyl-4-fluoro-1H-pyrazol-3-yl)methanamine (CAS 1638759-47-3)
- 3-Amino-4-methylsulfanyl-cyclobut-3-ene-1,2-dione (CAS 152836-69-6)
- 5-Fluoro-2-(3,3-difluoroazetidin-1-yl)nitrobenzene (CAS 1774894-13-1)
- 4-(Pyrimidin-4-yl)benzoic acid (CAS 249292-43-1)
- 3-(3-Chloro-4-(trifluoromethoxy)phenyl)propanoic acid (CAS 1261873-29-3)
- 1-Fluoro-2-methyl-5-nitro-3-(trifluoromethyl)benzene (CAS 1772627-98-1)
- 7-Chloropyrrolo[1,2-a]quinoxaline (CAS 1398949-29-5)
- Tert-butyl 3-bromo-2-formyl-1H-indole-1-carboxylate (CAS 1346156-91-9)
- 4-Methoxy-2-(methylamino)pyrimidine-5-carboxylic acid (CAS 72418-39-4)
- Sildenafil (CAS 139755-83-2)
- N-(4-Cyclopropoxy-2-isopropylphenyl)methanesulfonamide (CAS 1243377-00-5)
- Tau Peptide (304-318) trifluoroacetate salt (CAS 330456-49-0)
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