4,7-Bis(4-chlorophenyl)-3,4,5,6,7,8-hexahydro-2H-1-benzopyran-2,5-dione CAS 338750-78-0
Purity 97%+In StockPharmaceutical Standards
| CAS No. | 338750-78-0 |
| Molecular Formula | C21H16Cl2O3 |
| Molecular Weight | 387.26 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4,7-Bis(4-chlorophenyl)-3,4,5,6,7,8-hexahydro-2H-1-benzopyran-2,5-dione (CAS 338750-78-0) reference standard, produced by CATO (ISO 17034 / CNAS / ANAB accredited). Molecular formula: C21H16Cl2O3. Molecular weight: 387.26 g/mol. Trusted by 10,000+ laboratories worldwide for pharmaceutical analysis and QC.
Physical & Chemical Properties
| Molecular Formula | C21H16Cl2O3 |
| Molecular Weight | 387.26 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 13.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | Cl-containing |
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Recommended Standards
- 4-(2,4-Dichlorobenzoyl)-N-phenethyl-1H-pyrrole-2-carboxamide (CAS 439109-69-0)
- 5-Chloro-1-(4-chlorobenzyl)-N-methyl-6-oxo-N-phenyl-1,6-dihydropyridine-3-carboxamide (CAS 339024-77-0)
- 3-Bromo-2-(((1-phenyl-1H-tetrazol-5-yl)thio)methyl)imidazo[1,2-a]pyridine (CAS 306280-24-0)
- (R)-1-(5-aminopyridin-2-yl)pyrrolidin-3-ol (CAS 921592-86-1)
- 5-(5-Amino-2-methylphenoxy)pentan-1-ol (CAS 1249926-73-5)
- Olprinone Impurity 2 (CAS 116355-08-9)
- Nerandomilast impurity 3 (CAS CATO-C4X-34733)
- Ibrutinib Impurity 129 (CAS CATO-C4X-1064129)
- Alverine Impurity 10 HCl (CAS 27640-12-6(free base))
- Neuroendocrine Regulatory Peptide-1 (rat) (CAS 954420-51-0)
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