3-Bromo-2-hydroxycyclopent-2-en-1-one CAS 3019-83-8
| CAS No. | 3019-83-8 |
| Molecular Formula | C5H5BrO2 |
| Molecular Weight | 177.00 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Structurally, 3-Bromo-2-hydroxycyclopent-2-en-1-one (C5H5BrO2) contains a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution. The molecule exhibits a degree of unsaturation (DBE) of 3.0, corresponding to approximately 3 ring(s) or double-bond equivalent(s). With a molecular weight of 177.00 g/mol, it falls into the medium-molecular-weight range. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
3-Bromo-2-hydroxycyclopent-2-en-1-one (CAS 3019-83-8), molecular formula C5H5BrO2 and molecular weight 177.00 g/mol, is a CATO reference standard with documented purity and traceability.
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 | C5H5BrO2 |
| Molecular Weight | 177.00 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 | May oxidize slowly on prolonged air exposure; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1957 |
| Halogen Content | Br-containing |
Related Bromo Standards
- 5-Bromo-3-methoxypyrazole (CAS 1015779-81-3)
- (3-Bromo-1H-pyrazol-1-yl)methanol (CAS 1039454-62-0)
- 3-Bromo-5,6-dihydropyran-2-one (CAS 104184-64-7)
- 4-Bromo-3-methoxy-1H-pyrazole (CAS 1147011-26-4)
- (2-Bromo-1h-imidazol-4-yl)methanol (CAS 1162674-62-5)
- 2-Bromo-3-hydroxycyclopent-2-en-1-one (CAS 1189352-96-2)
- 4-Bromo-5,6-dihydro-2H-pyran-2-one (CAS 124066-92-8)
- 4-Bromo-3-methyl-2,5-dihydro-1,2-oxazol-5-imine (CAS 1356635-81-8)
Recommended Standards
- 3-(Bromomethyl)furan-2(5H)-one (CAS 58588-90-2)
- 3-Bromo-4-methylfuran-2(5H)-one (CAS 99848-02-9)
- 3-(Bromomethyl)-5-methyl-1,2,4-oxadiazole (CAS 959406-40-7)
- 4-(Bromomethyl)furan-2(5H)-one (CAS 61934-55-2)
- 3-Nitro-2-(p-tolyl)-2H-chromene (CAS 86628-44-6)
- 3-Bromo-3-(4-fluorophenyl)propiophenone (CAS 898768-14-4)
- 5-Methyl-2-phenyl-5-(p-tolylamino)isoxazolidin-3-one (CAS 371166-48-2)
- N-Isopropyl-3-oxo-2,3,5,6,7,8-hexahydrocinnoline-6-carboxamide (CAS 1706428-93-4)
- 1-(5-Methyl-[1,2,4]triazolo[1,5-a]pyrimidin-7-yl)-1H-imidazole-4-carboxylic acid (CAS 1281990-08-6)
- 3-Cyclopropoxy-5-(methylthio)pyridine (CAS 1243289-87-3)
- N-(1-Methyl-2-oxo-5-phenyl-2,3-dihydro-1H-1,4-benzodiazepin-3-yl)-2-(4-phenoxyphenyl)acetamide (CAS 1796882-73-9)
- 4'-Chloro-[1,1'-biphenyl]-3-sulfonyl chloride (CAS 501697-62-7)
- 1-Methyl-3-(pyridin-2-yl)-1H-pyrazol-5-ol (CAS 1279105-86-0)
- Semaglutide (CAS 910463-68-2)
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