3-Chloro-1-phenyl-1H-pyrazol-5-ol CAS 71762-42-0
| CAS No. | 71762-42-0 |
| Molecular Formula | C9H7ClN2O |
| Molecular Weight | 194.62 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 3-Chloro-1-phenyl-1H-pyrazol-5-ol.
CATO supplies 3-Chloro-1-phenyl-1H-pyrazol-5-ol (CAS 71762-42-0), a certified reference material (molecular formula C9H7ClN2O, MW 194.62 g/mol) for analytical method development and quality control.
3-Chloro-1-phenyl-1H-pyrazol-5-ol (C9H7ClN2O) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, chlorine substitution. Halogen substitution raises its density and boiling point; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
As a certified reference material (CRM), 3-Chloro-1-phenyl-1H-pyrazol-5-ol 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.
Physical & Chemical Properties
| Molecular Formula | C9H7ClN2O |
| Molecular Weight | 194.62 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1977 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Chloro Standards
- 5-Chloro-6-methyl-7H-pyrrolo[2,3-b]pyridine-3-carbaldehyde (CAS 1000340-13-5)
- 4-Chloro-7-methyl-1H-indazole-3-carbaldehyde (CAS 1000340-67-9)
- 6-(4-Chloro-1H-pyrazol-1-yl)pyridin-3-amine (CAS 1006961-40-5)
- 4-Chloro-1-methyl-1,8-naphthyridin-2(1H)-one (CAS 1009360-86-4)
- 4-Chloro-6-(4-methylpyrazol-1-yl)pyrimidine (CAS 1015845-71-2)
- 6-Chloro-n-(prop-2-yn-1-yl)pyridine-3-carboxamide (CAS 1017047-71-0)
- 2-Chloro-5-(4H-1,2,4-triazol-4-yl)aniline (CAS 1017791-27-3)
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Recommended Standards
- 3-Chloro-1-methyl-1,2-dihydroquinoxalin-2-one (CAS 55687-06-4)
- 3-Chloro-2-(1h-1,2,4-triazol-1-yl)aniline (CAS 869942-81-4)
- 3-Amino-7-chloroisoquinolin-1(2H)-one (CAS 76254-32-5)
- 3-Chloro-2-hydrazono-1,2-dihydroquinoxaline (CAS 51347-93-4)
- N-Hexanoylglycine-2,2-d2 (CAS 1256842-52-0)
- 5-Bromo-3-fluoro-2-nitrobenzenesulphonyl chloride (CAS 133361-04-3)
- 6-Iodo-1H-indazole-3-carbaldehyde (CAS 885518-80-9)
- 2H-1-Benzopyran-3-carbonitrile (CAS 57543-66-5)
- (2-aminoethyl)(methyl)[1-(1-methylcyclopropyl)ethyl]amine dihydrochloride (CAS 1803608-78-7)
- N-(5-amino-1,3,4-thiadiazol-2-yl)benzenesulfonamide (CAS 89782-62-7)
- Cefuroxime Impurity 85 (CAS CATO-C4X-124585)
- tert-Butyl (1R*,4R*)-4-(cyclobutanecarbonylamino)cyclohexylcarbamate (CAS 1286275-73-7)
- 2-Bromo-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic Acid (CAS 1422772-78-8)
- Des-Leu14-Tirzepatide (CAS CATO-CPTD788959)
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