(E)-(4-Methoxy-4-oxobut-2-en-1-yl)triphenylphosphonium bromide CAS 2181-98-8
| CAS No. | 2181-98-8 |
| Molecular Formula | C23H22O2P |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
(E)-(4-Methoxy-4-oxobut-2-en-1-yl)triphenylphosphonium bromide (CAS 2181-98-8) is a high-purity analytical reference standard with the molecular formula C23H22O2PBr and a molecular weight of 441.31 g/mol.
Based on its molecular formula C23H22O2PBr, (E)-(4-Methoxy-4-oxobut-2-en-1-yl)triphenylphosphonium bromide contains a steroid core, organophosphorus functionality, a hydroxyl group, an ether linkage, bromine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 441.31 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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).
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 | C23H22O2P Br |
| Molecular Weight | 441.31 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at room temperature, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 12.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Halogen Content | Br-containing |
Related E Standards
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Recommended Standards
- APO-12 (CAS 871-95-4)
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- 2-Azetidinomethyl-4-thiomethylbenzophenone (CAS 898754-65-9)
- (2,3-Dihydrobenzo[b][1,4]dioxin-2-yl)(1-oxa-4-thia-8-azaspiro[4.5]decan-8-yl)methanone (CAS 1351588-44-7)
- 4-{1H-pyrrolo[2,3-b]pyridin-4-yl}-1,2,3,6-tetrahydropyridine (CAS 916172-45-7)
- Methyl 2-acetylthiazole-4-carboxylate (CAS 76275-87-1)
- CAS 2230788-58-4 (CAS 2230788-58-4)
- Semaglutide impurity 62 (CAS CATO-C4X-222662)
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