4-(3,5-Diphenyl-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonic acid CAS 92708-87-7
| CAS No. | 92708-87-7 |
| Molecular Formula | C21H18N2O3S |
| Molecular Weight | 378.44 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
4-(3,5-Diphenyl-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonic acid (CAS 92708-87-7), molecular formula C21H18N2O3S and molecular weight 378.44 g/mol, is a CATO reference standard with documented purity and traceability.
4-(3,5-Diphenyl-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonic acid (C21H18N2O3S) contains a steroid core, an amide group, a sulfone 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 aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C21H18N2O3S |
| Molecular Weight | 378.44 g/mol |
| 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) | 14.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1983 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Diphenyl Standards
- 2,10-Diphenyl-1,2,4,9,10,12-hexaazadispiro[4.2.4(8).2(5)]Tetradecane-3,11-dione (CAS 338773-05-0)
- 2-((5,6-Diphenyl-1,2,4-triazin-3-yl)thio)-N,N-diethylacetamide (CAS 332393-80-3)
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Recommended Standards
- 3-[4-(4-fluorophenyl)-5-sulfanyl-4H-1,2,4-triazol-3-yl]-N,N-dimethylbenzene-1-sulfonamide (CAS 519152-65-9)
- 4-[4-(2-Fluorophenyl)piperazin-1-yl]-6-(methoxymethyl)-2-phenylpyrimidine (CAS 339279-02-6)
- 3-((2-Hydroxybenzyl)(p-tolyl)amino)benzo[d]isothiazole 1,1-dioxide (CAS 433315-00-5)
- 4-Methoxy-N-(2-phenyl-1H-indol-5-yl)benzenesulfonamide (CAS 919490-47-4)
- 1-Fluorocyclopentane-1-carboxamide (CAS 1855739-61-5)
- 2-Chloro-n-propyl-n-[(propylcarbamoyl)methyl]acetamide (CAS 1178363-63-7)
- 6'-Hydroxy-5'-methoxy-1'-methyl-2',3',8',8a'-tetrahydro-1'H-spiro[cyclohexa[2,5]diene-1,7'-cyclopenta[ij]isoquinolin]-4-one (CAS 17127-48-9)
- (R)-2-amino-2-(2-fluoro-6-methoxyphenyl)ethan-1-ol (CAS 1213512-19-6)
- 4-(chloromethyl)pyridazine (CAS 94693-72-8)
- 2-(5-Amino-[1,3,4]thiadiazol-2-ylsulfanyl)-N,N-diethyl-acetamide (CAS 332393-85-8)
- 2-(1,2,3,4-Tetrahydroquinolin-5-yl)acetic acid (CAS 1146298-67-0)
- 1-(5-((3,4-Dimethoxyphenyl)amino)-1,2,4-thiadiazol-3-yl)propan-2-one (CAS 521329-08-8)
- 6-Amino-4-(2,6-dichlorophenyl)-3-methyl-1-(o-tolyl)-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile (CAS 332177-33-0)
- Des-Ile27-Tirzepatide (CAS CATO-CPTD788946)
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