Di-o-tolylphosphonoacetic acid ethyl ester CAS 188945-41-7
| CAS No. | 188945-41-7 |
| Molecular Formula | C18H21O5P |
| Molecular Weight | 348.33 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 348.33 g/mol gives Di-o-tolylphosphonoacetic acid ethyl ester distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
Di-o-tolylphosphonoacetic acid ethyl ester (CAS 188945-41-7), molecular formula C18H21O5P and molecular weight 348.33 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of Di-o-tolylphosphonoacetic acid ethyl ester (C18H21O5P) is characterized by a flavonoid core, a phosphate ester group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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 | C18H21O5P |
| Molecular Weight | 348.33 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) | 8.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2010 |
Recommended Standards
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- Semaglutide impurity 34 (CAS CATO-C4X-222634)
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