3-Ethyl-4-methyl-5-(methylthio)isoxazole CAS 118631-13-3
| CAS No. | 118631-13-3 |
| Molecular Formula | C7H11NOS |
| Molecular Weight | 157.23 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 157.23 g/mol gives 3-Ethyl-4-methyl-5-(methylthio)isoxazole distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
3-Ethyl-4-methyl-5-(methylthio)isoxazole (CAS 118631-13-3), molecular formula C7H11NOS and molecular weight 157.23 g/mol, is a CATO reference standard with documented purity and traceability.
3-Ethyl-4-methyl-5-(methylthio)isoxazole (C7H11NOS) contains an amide group, sulfur-containing functionality, a hydroxyl group, an ether linkage. Its physicochemical properties are representative of its class; 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.
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.
CATO manufactures 3-Ethyl-4-methyl-5-(methylthio)isoxazole under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C7H11NOS |
| Molecular Weight | 157.23 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1990 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Recommended Standards
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- 2-(Tert-butyl)thiazol-5-ol (CAS 1159816-38-2)
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Why CATO?
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