(Ethoxymethylene)triphenylphosphorane CAS 55812-81-2
| CAS No. | 55812-81-2 |
| Molecular Formula | C21H21OP |
| Molecular Weight | 320.36 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 320.36 g/mol gives (Ethoxymethylene)triphenylphosphorane distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
(Ethoxymethylene)triphenylphosphorane (CAS 55812-81-2), molecular formula C21H21OP and molecular weight 320.36 g/mol, is a CATO reference standard with documented purity and traceability.
(Ethoxymethylene)triphenylphosphorane (C21H21OP) contains a steroid core, organophosphorus functionality, a hydroxyl group, an ether linkage. Its high carbon-to-hydrogen ratio confers good lipid solubility; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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).
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.
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 | C21H21OP |
| Molecular Weight | 320.36 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 11.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1972 |
Related Ethoxymethylene Standards
- 2-Benzyl-4-ethoxymethylene-4H-isoquinoline-1,3-dione (CAS 749219-34-9)
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- 4-Ethoxymethylene-2-(4-ethoxy-phenyl)-4H-isoquinoline-1,3-dione (CAS 750607-40-0)
- (E)-5-(Ethoxymethylene)-3-phenethyl-2-thioxothiazolidin-4-one (CAS 828299-72-5)
- 4-Ethoxymethylene-2-(3-trifluoromethyl-phenyl)-4H-isoquinoline-1,3-dione (CAS 499229-40-2)
- 4-(4-Ethoxymethylene-1,3-dioxo-3,4-dihydro-1H-isoquinolin-2-yl)-benzoic acid ethyl ester (CAS 750607-46-6)
- 4-(Ethoxymethylene)-2-(naphthalen-1-yl)oxazol-5(4H)-one (CAS 269733-57-5)
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Recommended Standards
- (E)-2-(4-fluorobenzyl)-6-(4-methylstyryl)pyridazin-3(2H)-one (CAS 306979-89-5)
- (R)-(2,3-Dihydrobenzo[b][1,4]dioxin-2-yl)methyl 4-methylbenzenesulfonate (CAS 62501-70-6)
- (5-(1,3-Dioxolan-2-yl)thiophen-2-yl)(3,4-dimethoxyphenyl)methanone (CAS 898779-10-7)
- (S)-(2,3-Dihydrobenzo[b][1,4]dioxin-2-yl)methyl 4-methylbenzenesulfonate (CAS 62501-73-9)
- 3-Hydroxy-3-methyl-4-phenylbutan-2-one (CAS 54123-76-1)
- 2-(4-Amino-1h-pyrazol-1-yl)-N-cyclopropyl-N-ethylacetamide (CAS 1156730-49-2)
- 1'-(3-ISopropoxy-4-nitrophenyl)-1,4'-bipiperidine (CAS 1820613-83-9)
- 2,6-Dichloronicotinamide (CAS 62068-78-4)
- 2-(3-(4-Chlorophenyl)-5-(furan-2-yl)-4,5-dihydro-1H-pyrazol-1-yl)-2-oxoethyl 2-(methylthio)nicotinate (CAS 473671-25-9)
- Cyclobutyl 3,5-dimethylphenyl ketone (CAS 898790-79-9)
- Cefpodoxime Proxetil EP Impurity D (CAS CATO-C4X-157945)
- (1-Methyl-1H-benzo[d]imidazol-2-yl)(pyridin-3-yl)methanamine (CAS 1017422-91-1)
- 3-Bromo-5-methyl-4-(trifluoromethyl)aniline (CAS 1804406-98-1)
- Semaglutide impurity 194 (CAS CATO-C4X-2226194)
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