Cefmetazole Impurity 47 CAS 4923-87-9
| CAS No. | 4923-87-9 |
| Molecular Formula | C8H5BrS |
| Molecular Weight | 213.09 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| 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 Cefmetazole Impurity 47.
Cefmetazole Impurity 47 (CAS 4923-87-9) is a certified pharmaceutical impurity reference standard with the molecular formula C8H5BrS and a molecular weight of 213.09 g/mol.
Cefmetazole Impurity 47 (C8H5BrS) contains sulfur-containing functionality, bromine substitution, an aromatic ring system. Halogen substitution raises its density and boiling point; 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.
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
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 | C8H5BrS |
| Molecular Weight | 213.09 g/mol |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Halogen Content | Br-containing |
| Sulfur Atoms | 1 |
Related Cefmetazole Standards
- Cefmetazole Impurity 46 (CAS 17347-32-9)
- Cefmetazole impurity 75 (CAS 62671-38-9)
- Cefmetazole Impurity 8 (CAS CATO-C4X-15078)
- Cefmetazole Impurity 31 (CAS 55862-52-7)
- Cefmetazole Impurity 44 (CAS CATO-C4X-150744)
- Cefmetazole Impurity 58 (CAS CATO-C4X-150758)
- Cefmetazole Impurity 48 (CAS 310466-38-7)
- Cefmetazole Impurity 21 (CAS 52069-55-3)
Recommended Standards
- 2,3-Difluoro-4-(trifluoromethoxy)aniline (CAS 107570-54-7)
- Brexpiprazole Impurity 32 (CAS 5118-13-8)
- 2,6-Difluoro-4-(trifluoromethoxy)aniline (CAS 1100833-35-9)
- 4-Bromotetrahydrothiopyran 1,1-Dioxide (CAS 38690-84-5)
- Metaxalone Impurity 2 (CAS CATO-C4X-30052)
- Diphenoxylate EP Impurity C (CAS 39186-58-8)
- Amylmetacresol EP Impurity I (CAS 173851-73-5)
- 2-[(2-methylpropyl)amino]-1-phenylethan-1-ol (CAS 55474-91-4)
- Furan-3-yl(3-methoxyphenyl)methanol (CAS 1339706-65-8)
- 2-Chloro-5-(trifluoromethyl)pyridin-3-ol (CAS 1196153-98-6)
- 1-(Methylthio)-5,6,7,8-tetrahydro-5,8-methanoisoquinoline (CAS 145041-54-9)
- N-methyl-2-((1-methyl-3-(trifluoromethyl)-1H-pyrazol-5-yl)oxy)-N-phenylacetamide (CAS 150311-29-8)
- 2-(Aminomethyl)-4-bromophenol (CAS 58349-96-5)
- D-Glu3-Tirzepatide (CAS CATO-CPTD788927)
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