1-(3-Bromo-5-ethylthiophen-2-yl)ethan-1-one CAS 99768-18-0
| CAS No. | 99768-18-0 |
| Molecular Formula | C8H9BrOS |
| Molecular Weight | 233.13 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
1-(3-Bromo-5-ethylthiophen-2-yl)ethan-1-one (CAS 99768-18-0), molecular formula C8H9BrOS and molecular weight 233.13 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 1-(3-Bromo-5-ethylthiophen-2-yl)ethan-1-one (C8H9BrOS) contains sulfur-containing functionality, a hydroxyl group, an ether linkage, bromine substitution, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 4.0, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 233.13 g/mol, it falls into the medium-molecular-weight range. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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 | C8H9BrOS |
| Molecular Weight | 233.13 g/mol |
| Purity | 97%+ |
| Storage | Store at room temperature, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1985 |
| Halogen Content | Br-containing |
| Sulfur Atoms | 1 |
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- 5-Bromo-2-(pyrrolidin-3-yl)thiazole (CAS 1159821-16-5)
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- 2-Bromo-1-(2,5-dimethylthiophen-3-yl)ethan-1-one (CAS 122654-17-5)
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Recommended Standards
- [3-Bromo-2-(methylsulfanyl)phenyl]methanol (CAS 2008218-26-4)
- 1-(4-Bromo-5-ethylthiophen-2-yl)ethan-1-one (CAS 89980-88-1)
- (5-Bromo-2-methoxyphenyl)methanethiol (CAS 63550-24-3)
- 1-(4-Bromothiophen-2-yl)-2-methylpropan-1-one (CAS 99769-26-3)
- (S)-3-(4-(borono-10B)phenyl)-2-formamidopropanoic acid (CAS CATO-C3D-263183)
- 2-(3-methylphenyl)ethanamine 2-m-tolyl-ethylamine 3-Methylphenethylamine 55755-17-4 (CAS 55755-17-4)
- 2-[1-Methyl-5-(trifluoromethyl)-1H-pyrazol-4-yl]-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidine-6-carbonitrile (CAS 957010-44-5)
- 7-Chloro-6-nitro-3-(phenylsulfonyl)-3H-imidazo[4,5-b]pyridine (CAS 1638767-29-9)
- (+/-)-2,3-Dibromobutane (CAS 598-71-0)
- SulfoxFluor (CAS 2143892-50-4)
- 1-(2-(Diethylamino)-2-oxoethyl)-1H-pyrrole-3-carboxylic acid (CAS 1518231-94-1)
- 3-Hydroxy-6-methyl-2H-furo[3,2-c]pyran-4(3H)-one (CAS 57053-18-6)
- (2S,3R,4S,5R)-2-(2-Chloro-4-nitrophenoxy)tetrahydro-2H-pyran-3,4,5-triol (CAS 96887-43-3)
- Semaglutide impurity 268 (CAS CATO-C4X-2226268)
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