(E)-4-(4-Bromophenyl)-4-oxobut-2-enoic acid CAS 20972-38-7
| CAS No. | 20972-38-7 |
| Molecular Formula | C10H7BrO3 |
| Molecular Weight | 255.06 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including (E)-4-(4-Bromophenyl)-4-oxobut-2-enoic acid.
(E)-4-(4-Bromophenyl)-4-oxobut-2-enoic acid (CAS 20972-38-7) is a high-purity analytical reference standard with the molecular formula C10H7BrO3 and a molecular weight of 255.06 g/mol.
Structurally, (E)-4-(4-Bromophenyl)-4-oxobut-2-enoic acid (C10H7BrO3) contains a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 7.0, corresponding to approximately 7 ring(s) or double-bond equivalent(s). With a molecular weight of 255.06 g/mol, it falls into the medium-molecular-weight range. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C10H7BrO3 |
| Molecular Weight | 255.06 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1962 |
| Halogen Content | Br-containing |
Related E Standards
- 4-Bromophenyl sulfurofluoridate (CAS 133042-63-4)
- (2E)-4-(3-Bromophenyl)-4-oxobut-2-enoic acid (CAS 337461-33-3)
- 2-Bromophenyl sulfofluoridate (CAS 2130839-88-0)
- 3-(4-Bromophenyl)dihydrofuran-2,5-dione (CAS 86967-06-8)
- 1-(3-Bromophenyl)imidazolidine-2,4-dione (CAS 1007579-01-2)
- [5-(4-bromophenyl)-1,3,4-oxadiazol-2-yl]methanol (CAS 1153761-13-7)
- 5-(2-Bromophenyl)imidazolidine-2,4-dione (CAS 1214020-90-2)
- (3-(4-Bromophenyl)-1,2,4-oxadiazol-5-yl)methanol (CAS 1342560-61-5)
Recommended Standards
- 1-(4-Bromo-7-hydroxybenzofuran-2-yl)ethanone (CAS 803686-18-2)
- 1-Iodoisoquinoline (CAS 19658-77-6)
- 1-[2-chloro-1-(chloromethyl)-3,3,3-trifluoroprop-1-enyl]benzene (CAS 256525-85-6)
- 4-Bromo-1-(difluoromethyl)-5-(ethoxymethyl)-1H-pyrazole (CAS 1856097-02-3)
- 2-Cyclopropyl-imidazo[1,2-a]pyrazin-3-amine (CAS 723286-63-3)
- 1-(1-(4-(2-Methoxyphenoxy)butyl)-1H-benzo[d]imidazol-2-yl)propan-1-ol (CAS 887348-95-0)
- tert-Butyl (5-bromoquinoxalin-6-yl)carbamate (CAS 1873940-01-2)
- 5-(4-Methoxyphenyl)imidazolidine-2,4-dione (CAS 6617-78-3)
- Lacosamide Impurity 52 (CAS CATO-C4X-183052)
- 3-ethenyl-4-iodopyridin-2-ol (CAS 2126179-04-0)
- Bis((R)-4-methyl-4,5-dihydrooxazol-2-yl)methane (CAS 2757082-29-2)
- 2-Chloro-7-(trifluoromethyl)benzo[d]oxazole (CAS 1804145-98-9)
- 6-Deoxy-6-fluoro-D-galactose (CAS 447-25-6)
- Semaglutide Impurity 158 (x TFA Salt) (CAS CATO-C4X-2226158)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com