Eszopiclone Impurity 23 CAS 43200-82-4
| CAS No. | 43200-82-4 |
| Molecular Formula | C11H5ClN4O2 |
| Molecular Weight | 260.64 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO manufactures Eszopiclone Impurity 23 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Eszopiclone Impurity 23 (CAS 43200-82-4) is a certified pharmaceutical impurity reference standard with the molecular formula C11H5ClN4O2 and a molecular weight of 260.64 g/mol.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, chlorine substitution, Eszopiclone Impurity 23 is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 260.64 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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.
Physical & Chemical Properties
| Molecular Formula | C11H5ClN4O2 |
| Molecular Weight | 260.64 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1969 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 4 |
Related Eszopiclone Standards
- Eszopiclone Impurity 6 (CAS 1122549-43-2)
- Eszopiclone Impurity 7 (CAS 43200-83-5)
- Eszopiclone Impurity 26 (CAS 7560-85-2)
- Eszopiclone Impurity 24 (CAS 4744-50-7)
- Eszopiclone impurity 26 (CAS 151776-26-0)
- Eszopiclone Impurity 25 (CAS 43200-88-0)
- Eszopiclone (S-Zopiclone) (CAS 138729-47-2)
- Eszopiclone Impurity 21 (CAS CATO-C4X-123821)
Recommended Standards
- 6-(chloromethyl)-5-(trifluoromethyl)-[1,2,5]oxadiazolo[3,4-b]pyridin-7-amine (CAS 2368939-40-4)
- 5-Nitro-1h-indole-3-sulfonyl chloride (CAS 132744-99-1)
- 5-Chloromethyl-2-(4-(trifluoromethyl)-phenyl)-1H-imidazole (CAS 466664-94-8)
- Methyl 6-(chlorosulfonyl)-4-cyanopicolinate (CAS 1393570-46-1)
- Letermovir Impurity 12 (CAS CATO-C4X-291512)
- Difelikefalin Impurity 76 (CAS CATO-C4X-304176)
- Metformin Impurity N74 (CAS 1609-00-3)
- 1-Methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-1,2,4-triazole (CAS 2186640-04-8)
- 3,4-Dimethoxy-α-naphthoflavone (CAS 14756-24-2)
- Methotrexate Impurity 42 (CAS 79974-19-9)
- Crizotinib impurity 29 (CAS CATO-C4X-102529)
- 2-Butoxy-4-chloro-3-fluoro-1-methoxybenzene (CAS 1881322-05-9)
- 2,2,2-trifluoroethyl 3,4-dimethylphenylcarbamate (CAS 1087797-84-9)
- Semaglutide Impurity 189 (CAS CATO-C4X-2226189)
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