Naphthol AS-BI Phosphate CAS 1919-91-1
| CAS No. | 1919-91-1 |
| Molecular Formula | C18H31BrNO6P |
| Molecular Weight | 468.32 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
Naphthol AS-BI Phosphate (CAS 1919-91-1) is a high-purity analytical reference standard with the molecular formula C18H31BrNO6P and a molecular weight of 468.32 g/mol.
Structurally, Naphthol AS-BI Phosphate (C18H31BrNO6P) contains an amide group, a phosphate ester group, a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution. The molecule exhibits a degree of unsaturation (DBE) of 3.5, corresponding to approximately 3 ring(s) or double-bond equivalent(s). With a molecular weight of 468.32 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 | C18H31BrNO6P |
| Molecular Weight | 468.32 g/mol |
| Appearance | White to pale yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at room temperature, 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 3.5 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1957 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 1 |
Related Naphthol Standards
- 1-Naphthol 2,3,4-Tri-O-acetyl-β-D-glucuronide Methyl Ester (CAS 18404-55-2)
- Naphthol AS Nonanoate (CAS 10523-82-7)
- Naphthol AS-BI β-D-galactopyranoside (CAS 51349-63-4)
- Naphthol AS-TR phosphate (CAS 2616-72-0)
- Naphthol AS-MX Phosphate (CAS 1596-56-1)
- Naphthol AS-G (CAS 91-96-3)
- Naphthol AS-OL phosphate (CAS 84522-15-6)
- Naphthol AS-BI (CAS 1237-75-8)
Recommended Standards
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- Clotrimazole EP Impurity E (CAS 5162-03-8)
- Semaglutide Impurity 163 (x TFA Salt) (CAS CATO-C4X-2226163)
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