3-Ethoxy-4-hydroxybenzoic acid CAS 5438-38-0
| CAS No. | 5438-38-0 |
| Molecular Formula | C9H10O4 |
| Molecular Weight | 182.17 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 3-Ethoxy-4-hydroxybenzoic acid (CAS 5438-38-0), a certified reference material (molecular formula C9H10O4, MW 182.17 g/mol) for analytical method development and quality control.
The molecular framework of 3-Ethoxy-4-hydroxybenzoic acid (C9H10O4) is characterized by a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. 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 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 | C9H10O4 |
| Molecular Weight | 182.17 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | >95% |
| Storage | Store at 2-8°C, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
Related Ethoxy Standards
- 4-Ethoxy-2-hydroxybenzoic acid (CAS 10435-55-9)
- 1-ethoxy-4-ethynyl-2,3-difluorobenzene (CAS 928208-56-4)
- 3-ethoxy-2-hydroxybenzoic acid (CAS 67127-72-4)
- 3-Ethoxy-4,5-dihydroxybenzaldehyde (CAS 62040-18-0)
- 4-Ethoxy-2,3-dihydroxybenzaldehyde (CAS 757995-98-5)
- 4-Ethoxy-3-hydroxybenzoic acid (CAS 90536-50-8)
- 3-Ethoxy-4-nitroaniline (CAS 116435-75-7)
- 2-Ethoxy-3-methyl-5-nitropyridine (CAS 1354224-95-5)
Recommended Standards
- 3-Hydroxy-4-(methoxymethoxy)benzaldehyde (CAS 65299-00-5)
- 3-Hydroxy-5-methoxy-4-methylbenzoic acid (CAS 72922-62-4)
- 3,4-Dimethoxy[7-13C]-benzoic Acid (CAS 90140-57-1)
- 3-Methyl orsellinic Acid (CAS 4707-46-4)
- 2-Amino-3-chloro-6-methyl-benzoic acid (CAS 72618-63-4)
- 1-(3,5-Dimethoxyphenyl)ethanamine (CAS 97294-78-5)
- tert-Butyl 2-(2-methylallyl)-3-oxopiperidine-1-carboxylate (CAS 1823817-81-7)
- 1-(1H-indazole-5-carboxamido)cyclopentane-1-carboxylic acid (CAS 1099147-55-3)
- 6-Chloro-4-(trifluoromethyl)pyridazine-3-carboxylic acid (CAS 1260758-47-1)
- methyl 3-amino-2-(propan-2-yloxy)benzoate hydrochloride (CAS 1803581-06-7)
- 1,4-Thioxane (CAS 15980-15-1)
- Dimethyl 2,5-dimethoxyterephthalate (CAS 21004-12-6)
- Methyl 2-(2-imino-5,6-dimethoxybenzo[d]thiazol-3(2H)-yl)acetate hydrobromide (CAS 1949836-85-4)
- Semaglutide impurity 270 (CAS CATO-C4X-2226270)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com