4-(4-Hydroxy-phenylazo)benzoic acid ethyl ester CAS 4418-89-7
| CAS No. | 4418-89-7 |
| Molecular Formula | C15H14N2O3 |
| Molecular Weight | 270.28 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
4-(4-Hydroxy-phenylazo)benzoic acid ethyl ester (CAS 4418-89-7), molecular formula C15H14N2O3 and molecular weight 270.28 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, 4-(4-Hydroxy-phenylazo)benzoic acid ethyl ester is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 270.28 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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.
Physical & Chemical Properties
| Molecular Formula | C15H14N2O3 |
| Molecular Weight | 270.28 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 DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 2 |
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Recommended Standards
- 4-(3,4-Dihydro-2H-benzo[b][1,4]dioxepin-7-yl)benzoic acid (CAS 952183-13-0)
- 4-(4-Methoxybenzoyl)phenyl acetate (CAS 97576-09-5)
- 4-(3-(p-Tolyl)ureido)benzoic acid (CAS 74088-10-1)
- 4-(Boc-amino)-3-methoxy-1-methyl-1H-pyrrole-2-carboxylic Acid (CAS 212184-27-5)
- 5-Amino-3,3-dimethyl-3,4-dihydroquinolin-2(1h)-one (CAS 2091182-71-5)
- Tert-butyl (3-carbamothioyl-4-fluorophenyl)carbamate (CAS 1342976-14-0)
- n-(2,4-Dimethylphenyl)-1,3-thiazolidine-4-carboxamide (CAS 1104793-76-1)
- 3-(O-tolylcarbamoyl)naphthalen-2-yl acetate (CAS 528-66-5)
- 1-Hydrazono-3,3-dimethyl-1,2,3,4-tetrahydroisoquinoline (CAS 163557-60-6)
- 5-(2-Fluorophenyl)-3-(trifluoromethyl)picolinic acid (CAS 1214369-02-4)
- Pretomanid Impurity 10 (CAS CATO-C4X-260610)
- 2-(2-Oxo-2,3-dihydro-1H-benzo[d]imidazo[1,2-a]imidazol-3-yl)acetic acid (CAS 1025684-92-7)
- 3-Iodo-4-nitro-1,1'-biphenyl (CAS 905920-49-2)
- (Glu1)-Fibrinopeptide B (human) (CAS 103213-49-6)
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