4,4'-(Phenylphosphoryl)dibenzoic acid CAS 803-19-0
| CAS No. | 803-19-0 |
| Molecular Formula | C20H15O5P |
| Molecular Weight | 366.30 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 366.30 g/mol gives 4,4'-(Phenylphosphoryl)dibenzoic acid distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
4,4'-(Phenylphosphoryl)dibenzoic acid (CAS 803-19-0), molecular formula C20H15O5P and molecular weight 366.30 g/mol, is a CATO reference standard with documented purity and traceability.
4,4'-(Phenylphosphoryl)dibenzoic acid (C20H15O5P) contains a flavonoid core, a phosphate ester group, a hydroxyl group, an ether linkage. The carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C20H15O5P |
| Molecular Weight | 366.30 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) | 13.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
Recommended Standards
- 3,5-Dichloro-4-thiomorpholinomethyl benzophenone (CAS 898783-18-1)
- 4-Bromo-3-fluorophenylzinc iodide 0.5 M in Tetrahydrofuran (CAS 352525-65-6)
- 3,5-Dichloro-2-thiomorpholinomethyl benzophenone (CAS 898782-38-2)
- O6-[4-(Trifluoroacetamidomethyl)benzyl]guanine, 97% (CAS 680622-70-2)
- 3-Amino-4,4-dibenzyl-1H-pyrazol-5(4H)-one (CAS 152902-62-0)
- 4-(2,2-Difluoroethyl)piperidin-4-amine (CAS 1889878-41-4)
- 3,3,4,4,5,5-Hexafluoropentan-1-ol (CAS 1639207-59-2)
- 3-Chloro-N-(piperidin-3-ylmethyl)-5-(trifluoromethyl)pyridin-2-amine hydrochloride (CAS 1185319-70-3)
- 2-chloro-7-methoxy-8-methyl-3,4-dihydroquinazolin-4-one (CAS 923275-17-6)
- R(+)-Cathinone HCl (CAS 76333-53-4)
- 5,6-Dihydro-4H-cyclopenta[c]isoxazol-6-amine (CAS 1417728-48-3)
- Methyl 3-chloro-5-methylthiophene-2-carboxylate (CAS 229343-19-5)
- Levpropoxyphene Napsylate Monohydrate (CAS 55557-30-7)
- (Ser(PO?H?)2?2)-Tau Peptide (260-264) PAb Blocking trifluoroacetate salt (CAS 2022956-57-4)
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