5-(4-Methoxyphenyl)-1H-1,2,4-triazol-3(2H)-one CAS 33199-43-8
| CAS No. | 33199-43-8 |
| Molecular Formula | C9H9N3O2 |
| Molecular Weight | 191.19 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.
CATO supplies 5-(4-Methoxyphenyl)-1H-1,2,4-triazol-3(2H)-one (CAS 33199-43-8), a certified reference material (molecular formula C9H9N3O2, MW 191.19 g/mol) for analytical method development and quality control.
5-(4-Methoxyphenyl)-1H-1,2,4-triazol-3(2H)-one (C9H9N3O2) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; 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.
Physical & Chemical Properties
| Molecular Formula | C9H9N3O2 |
| Molecular Weight | 191.19 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (faint amine-like odor) |
| 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1966 |
| Nitrogen Atoms | 3 |
Related Methoxyphenyl Standards
- 3-(4-Methoxyphenyl)-1,2,4-oxadiazol-5-amine (CAS 114065-39-3)
- 4-(3-methoxyphenyl)-1,2,5-oxadiazol-3-amine (CAS 1249939-19-2)
- 5-(3-Methoxyphenyl)-1,2,4-oxadiazol-3-amine (CAS 1340284-34-5)
- 5-(2-Methoxyphenyl)-1,2,4-oxadiazol-3-amine (CAS 1342747-92-5)
- 4-(3-Methoxyphenyl)-4H-1,2,4-triazol-3-ol (CAS 1427460-99-8)
- 5-(3-Methoxyphenyl)-1,3,4-oxadiazol-2-amine (CAS 1673-44-5)
- 4-(4-Methoxyphenyl)-1,2,5-oxadiazol-3-amine (CAS 49615-69-2)
- 4-(4-Methoxyphenyl)-2,4-dihydro-3H-1,2,4-triazol-3-one (CAS 80240-44-4)
Recommended Standards
- 5-(4-Methoxyphenyl)-1,2,4-oxadiazol-3-amine (CAS 23275-52-7)
- 5-(Furan-2-yl)-1-methyl-1H-pyrazole-4-carboxamide (CAS 61621-13-4)
- 5-(4-Aminophenyl)imidazolidine-2,4-dione (CAS 75176-84-0)
- 5-(Phenoxymethyl)-1,3,4-oxadiazol-2-amine (CAS 21520-88-7)
- N-Allyl-4-chloroaniline (CAS 13519-80-7)
- 2-Methylpyrazolo[1,5-a]pyridine-3-carboxylic acid (CAS 80537-08-2)
- N-ethyl-5-hydroxypentanamide (CAS 1226291-91-3)
- Ethyl 1-Methyl-3-oxo-2,3-dihydropyrazole-4-carboxylate (CAS 103626-03-5)
- Isocohumulone (CAS 25269-20-9)
- Tert-butyl (4-aminopiperidin-3-yl)carbamate (CAS 1779412-62-2)
- 3-BROMO-4-METHOXYBENZOIC ACID METHYL ESTER 35450-37-4 AKOS 212-63 AS03638 BENZOIC ACID, 3-BROMO-4-METHOXY-, METHYL ESTER Methyl 3-bromo-4-methoxybenzoate RARECHEM AL BF 0247 (CAS 35450-37-4)
- Tert-butyl ((3S,4S)-4-aminopiperidin-3-yl)carbamate hydrochloride (CAS 2306246-90-0)
- tert-Butyl acetylcarbamate (CAS 120157-98-4)
- [3-31]-Semaglutide D (CAS C152H230N42O47)
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