4-Bromobut-2-enoic Acid CAS 20629-35-0
| CAS No. | 20629-35-0 |
| Molecular Formula | C4H5BrO2 |
| Molecular Weight | 164.99 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 4-Bromobut-2-enoic Acid.
4-Bromobut-2-enoic Acid (CAS 20629-35-0) is a high-purity analytical reference standard with the molecular formula C4H5BrO2 and a molecular weight of 164.99 g/mol.
4-Bromobut-2-enoic Acid (C4H5BrO2) contains a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution. Halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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.
As a certified reference material (CRM), 4-Bromobut-2-enoic Acid 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 | C4H5BrO2 |
| Molecular Weight | 164.99 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 2.0 |
| CAS Registry Year (est.) | 1962 |
| Halogen Content | Br-containing |
Related Bromobut Standards
- 2-Bromobut-2-enoic acid (CAS 5405-34-5)
- 4-Bromobut-2-enamide (CAS 118941-93-8)
- Methyl 4-bromobut-2-ynoate (CAS 40995-01-5)
- 4-bromobut-3-en-1-ol (CAS 306749-29-1)
- Methyl 2-bromobut-2-enoate (mixture of trans and ciS) (CAS 22966-48-9)
- 3-Bromobut-3-en-1-amine (CAS 328058-75-9)
- 4-Bromobut-2-yn-1-ol (CAS 13280-08-5)
- (E)-3-Bromobut-2-enal (CAS 33603-83-7)
Recommended Standards
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- 4-Bromodihydrofuran-3(2H)-one (CAS 204926-50-1)
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- rel-(1R,2S)-2-Bromocyclopropane-1-carboxylic acid (CAS 60212-40-0)
- tert-Butyl 14-(N-Boc-amino)-1-[3-(methoxycarbonyl)phenoxy]-13,15-dioxo-3,6,9-trioxa- 12,16-diazanonadecan-19-oate (CAS 1076199-61-5)
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