(E)-3-Methyl-4-((methylthio)methylene)isoxazol-5(4H)-one CAS 61861-35-6
| CAS No. | 61861-35-6 |
| Molecular Formula | C6H7NO2S |
| Molecular Weight | 157.19 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
(E)-3-Methyl-4-((methylthio)methylene)isoxazol-5(4H)-one (C6H7NO2S) contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. The carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
(E)-3-Methyl-4-((methylthio)methylene)isoxazol-5(4H)-one (CAS 61861-35-6), molecular formula C6H7NO2S and molecular weight 157.19 g/mol, is a CATO reference standard with documented purity and traceability.
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 | C6H7NO2S |
| Molecular Weight | 157.19 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 |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1974 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Recommended Standards
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- (R)-2-Amino-2-(thiophen-2-yl)acetic acid (CAS 65058-23-3)
- 1-(3-Methoxy-1,2-thiazol-5-yl)ethan-1-one (CAS 1935654-61-7)
- (S)-2-Amino-2-(thiophen-2-yl)acetic acid (CAS 43189-45-3)
- N-(1-Benzylpiperidin-4-yl)-4-fluorobenzamide (CAS 132442-35-4)
- 2-([2,2'-Bipyridin]-6-yl)acetic acid (CAS 203573-78-8)
- 2-(bromomethyl)-5-chloropyridine hydrobromide (CAS 1646152-49-9)
- ((1R,2S)-2-Amino-2-methylcyclopentyl)methanol (CAS 202921-91-3)
- 4-Bromo-3-(sec-butoxymethyl)-1-(2-fluoroethyl)-1H-pyrazole (CAS 1856042-65-3)
- 4-Methoxyindazole-3-carbonitrile (CAS 1264481-61-9)
- Tert-butyl 4-(1-amino-2-methoxy-2-oxoethyl)-2-methylpiperidine-1-carboxylate (CAS 2293098-67-4)
- 4'-(Pyrrolidin-1-ylsulfonyl)-5-(trifluoromethyl)-[1,1'-biphenyl]-3-ol (CAS 1261991-27-8)
- 1-Ethyl 3-methyl 2-methoxymalonate (CAS 56752-40-0)
- Semaglutide impurity 255 (CAS CATO-C4X-2226255)
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