4-(2,4-Dichlorophenyl)-7,7-dimethyl-4,6,7,8-tetrahydro-2H-chromene-2,5(3H)-dione CAS 338778-02-2
| CAS No. | 338778-02-2 |
| Molecular Formula | C17H16Cl2O3 |
| Molecular Weight | 339.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-(2,4-Dichlorophenyl)-7,7-dimethyl-4,6,7,8-tetrahydro-2H-chromene-2,5(3H)-dione (CAS 338778-02-2), molecular formula C17H16Cl2O3 and molecular weight 339.21 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C17H16Cl2O3, 4-(2,4-Dichlorophenyl)-7,7-dimethyl-4,6,7,8-tetrahydro-2H-chromene-2,5(3H)-dione contains a steroid core, a hydroxyl group, an ether linkage, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 339.21 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C17H16Cl2O3 |
| Molecular Weight | 339.21 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) | 9.0 |
| 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-((3,4-Dichlorobenzyl)thio)-6-fluorocinnoline (CAS 1683-35-8)
- 4-[2-(benzyloxy)-3,5-dichlorophenyl]-4-hydroxy-2-butanone (CAS 339020-54-1)
- 4-((2,4-Dichlorobenzyl)thio)-8-fluorocinnoline (CAS 1683-34-7)
- tert-Butyl 3-(2-iodoethyl)piperidine-1-carboxylate (CAS 146667-86-9)
- N-(2,6-dimethylphenyl)formamide (CAS 607-92-1)
- 3-(5-Chlorothiophen-2-yl)propanoic acid (CAS 69300-47-6)
- 1-(2-chloro-4-(trifluoromethyl)phenyl)propan-1-one (CAS 188120-65-2)
- 2-(Methylsulfonyl)imidazole (CAS 27098-98-2)
- 1,3-Dichloro-8-methylisoquinoline (CAS 21902-39-6)
- Methyl 3-(5-methyl-3-(trifluoromethyl)-1h-pyrazol-1-yl)propanoate (CAS 1002033-72-8)
- 3-((2,4-Dichlorobenzyl)thio)-5,6-dihydrobenzo[h]cinnoline (CAS 478047-86-8)
- 5-Methyl-4-{6-methylimidazo[1,2-a]pyridin-2-yl}-1,2-oxazole (CAS 478049-22-8)
- Ethyl 2-(2-((3-cyano-6-methyl-4-(trifluoromethyl)pyridin-2-yl)thio)acetamido)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate (CAS 445383-14-2)
- 149471-11-4 Neuropeptide DF2 L-Phenylalaninamide, L-alpha-aspartyl-L-arginyl-L-asparaginyl-L-phenylalanyl-L-leucyl-L-arginyl- Asp-arg-asn-phe-leu-arg-phe-NH2 Aspartyl-arginyl-asparaginyl-phenylalanyl-leucyl-arginyl-phenylalaninamide L-alpha-Aspartyl-L-arginyl-L-asparaginyl-L-phenylalanyl-L-leucyl-L-arginyl-L-phenylalaninamide DF(2) Neuropeptide Drnflrfamide (CAS 149471-11-4)
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