2,5-Bis(methoxycarbonyl)-3,4-diphenylcyclopentadienone CAS 16691-79-5
| CAS No. | 16691-79-5 |
| Molecular Formula | C21H16O5 |
| Molecular Weight | 348.35 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
2,5-Bis(methoxycarbonyl)-3,4-diphenylcyclopentadienone (CAS 16691-79-5) is a high-purity analytical reference standard with the molecular formula C21H16O5 and a molecular weight of 348.35 g/mol.
Structurally, 2,5-Bis(methoxycarbonyl)-3,4-diphenylcyclopentadienone (C21H16O5) contains a flavonoid core, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 14.0, corresponding to approximately 14 ring(s) or double-bond equivalent(s). With a molecular weight of 348.35 g/mol, it falls into the moderately-high-molecular-weight range. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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 | C21H16O5 |
| Molecular Weight | 348.35 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 14.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1961 |
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Recommended Standards
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- 4-(2-Chloroacetyl)-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one (CAS 6630-73-5)
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- HT1171 (CAS 192880-96-9)
- 1,6-dimethyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carbonitrile (CAS 5900-41-4)
- n-((1h-Imidazol-2-yl)methyl)-2-methoxypyridin-3-amine (CAS 1248929-21-6)
- 2-(3-Phenylisoxazol-5-yl)acetic acid (CAS 3919-84-4)
- 14390-75-1 Tellurium, isotope of mass 128 Tellurium-128 128Te (CAS 14390-75-1)
- 4-Chloro-1-((1-ethyl-1h-pyrazol-4-yl)methyl)-1,2-dihydro-3h-pyrazol-3-imine (CAS 1004452-02-1)
- 5-Methyl-2-phenyl-[1,3]oxazolo[5,4-b]pyridin-6-amine (CAS 2034156-85-7)
- Semaglutide impurity 78 (CAS CATO-C4X-222678)
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