5-Methyl-1-phenylpyrazole-4-carboxylic Acid CAS 91138-00-0
| CAS No. | 91138-00-0 |
| Molecular Formula | C11H10N2O2 |
| Molecular Weight | 202.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 5-Methyl-1-phenylpyrazole-4-carboxylic Acid meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
5-Methyl-1-phenylpyrazole-4-carboxylic Acid (CAS 91138-00-0), molecular formula C11H10N2O2 and molecular weight 202.21 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage, 5-Methyl-1-phenylpyrazole-4-carboxylic Acid is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 202.21 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C11H10N2O2 |
| Molecular Weight | 202.21 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1983 |
| Nitrogen Atoms | 2 |
Related Methyl Standards
- 1-Methyl-5-phenylpyrazole-3-carboxylic Acid (CAS 10199-53-8)
- 5-Methyl-1-phenylpyrazole-3-carboxylic Acid (CAS 10199-57-2)
- 3-Phenylpyrazole-5-carboxylic Acid (CAS 5071-61-4)
- Ethyl 3-phenylpyrazole-5-carboxylate (CAS 13599-12-7)
- 5-Methyl-1-phenylpyrazole-3-carbohydrazide (CAS 948294-15-3)
- Ethyl 4-Phenylpyrazole-3-carboxylate (CAS 6963-62-8)
- 5-Methyl-1-phenylpyrazole-4-carbonyl chloride (CAS 205113-77-5)
- 1-Phenylpyrazole-4-sulfonic acid (CAS 18336-36-2)
Recommended Standards
- 5-Methyl-1-phenyl-1H-1,2,3-triazole-4-carboxamide (CAS 861378-09-8)
- 5-Methyl-2-phenyl-1h-imidazole-4-carboxylic acid (CAS 28824-94-4)
- 5-Methoxy-6-phenylpyridazin-3-ol (CAS 473934-58-6)
- 5-Methyl-2-phenyl-2H-1,2,3-triazole-4-carboxamide (CAS 36401-53-3)
- 3-[2-(7-chloro-1,8-naphthyridin-3-yl)ethynyl]-1H-pyridin-2-one (CAS 2448447-47-8)
- 2-Methoxy-2-(pyridin-2-yl)acetic acid (CAS 59769-10-7)
- Propyl chloroformate-d<SUB>7</SUB> (CAS 1228182-42-0)
- 3,4-Dimethyl-5-(methylamino)benzene-1-sulfonamide (CAS 1341509-13-4)
- 2-(4-(Trifluoromethyl)pyrimidin-2-yl)acetic acid (CAS 944903-22-4)
- 4-Ethyl-6-methoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride (CAS 1243382-71-9)
- (3-Chloro-4-fluorophenyl)(cyclopentyl)methanol (CAS 1339640-22-0)
- H-D-Phe-D-Phe-D-Leu-D-Lys-Pip-OH TFA (CAS CATO-CPTD788716)
- (3-Amino-pyridin-4-yl)-methanol (CAS 152398-05-5)
- [Tyr15] Fibrinopeptide B, human (CAS 125455-56-3)
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