5-ACetyl-2-acetylamino-4-methyl-thiophene-3-carboxylic acid methyl ester CAS 4651-88-1
| CAS No. | 4651-88-1 |
| Molecular Formula | C11H13NO4S |
| Molecular Weight | 255.29 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
5-ACetyl-2-acetylamino-4-methyl-thiophene-3-carboxylic acid methyl ester (CAS 4651-88-1), molecular formula C11H13NO4S and molecular weight 255.29 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 5-ACetyl-2-acetylamino-4-methyl-thiophene-3-carboxylic acid methyl ester (C11H13NO4S) contains a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 6.0, corresponding to approximately 6 ring(s) or double-bond equivalent(s). With a molecular weight of 255.29 g/mol, it falls into the medium-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
As a certified reference material (CRM), 5-ACetyl-2-acetylamino-4-methyl-thiophene-3-carboxylic acid methyl ester 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 | C11H13NO4S |
| Molecular Weight | 255.29 g/mol |
| 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related ACetyl Standards
- 2'-(Acetylamino)[1,1'-biphenyl]-4-carboxylic acid (CAS 854236-96-7)
- N-(4-Acetylamino-3-methyl-phenyl)-2-chloro-propionamide (CAS 500188-25-0)
- N-(3-Acetylamino-4-methoxy-phenyl)-2-chloro-acetamide (CAS 936820-39-2)
- 4-acetylamino-3-methyl-benzenesulfonyl chloride (CAS 14988-21-7)
- 4-[2-(Acetylamino)ethoxy]-3-methoxybenzoic acid (CAS 1096334-76-7)
- 4-ACetylamino-3-methyl-5-nitro-benzoic acid methyl ester (CAS 1263818-07-0)
- Ethyl 4-(acetylamino)-3-nitrobenzoate (CAS 175204-17-8)
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Recommended Standards
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- 1-(3-(1H-imidazol-1-yl)propyl)-3-(benzo[d][1,3]dioxol-5-yl)urea (CAS 692732-94-8)
- 5-Bromo-3-(difluoromethyl)-4-methylpyridin-2(1H)-one (CAS 1804885-73-1)
- 4-(4-Phenyl-4H-1,2,4-triazol-3-yl)piperidine (CAS 94225-92-0)
- (2,4,6-Trimethoxyphenyl)methanol (CAS 61040-78-6)
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- 2,3-dihydropyrano[3,2-b]pyridin-4-one (CAS 405174-48-3)
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