1-(2-Methyl-4-sulfophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid CAS 67939-25-7
| CAS No. | 67939-25-7 |
| Molecular Formula | C11H10N2O6S |
| Molecular Weight | 298.27 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
1-(2-Methyl-4-sulfophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid (CAS 67939-25-7), molecular formula C11H10N2O6S and molecular weight 298.27 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage, 1-(2-Methyl-4-sulfophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-carboxylic acid is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 298.27 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 1-(2-Methyl-4-sulfophenyl)-5-oxo-4,5-dihydro-1H-pyrazole-3-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.
Physical & Chemical Properties
| Molecular Formula | C11H10N2O6S |
| Molecular Weight | 298.27 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| 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.) | 1976 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Methyl Standards
- 5-Oxo-1-(4-sulfophenyl)-2,5-dihydro-1H-pyrazole-3-carboxylic acid (CAS 51307-71-2)
- 5-Oxo-1-(4-Sulfophenyl)-4,5-Dihydro-1H-Pyrazole-3-Carboxylic Acid (CAS 118-47-8)
- 8(p-Sulfophenyl)theophylline (CAS 80206-91-3)
- 3-[Ethyl[(4-sulfophenyl)methyl]amino]benzenesulfonic Acid (CAS 6268-04-8)
- 2-(4-sulfophenyl)acetic acid (CAS 153661-28-0)
- 4,4'-(((4-Sulfophenyl)azanediyl)bis(methylene))dibenzoic acid (CAS 2105860-95-3)
- 4,7-Bis(4-sulfophenyl)-1,10-phenanthroline disodium salt (CAS 53744-42-6)
- 5'-(4-Sulfophenyl)-[1,1':3',1''-terphenyl]-4,4''-disulfonic acid (CAS 343821-13-6)
Recommended Standards
- (Furan-2-yl(hydroxy)methyl)diphenylphosphine oxide (CAS 371958-83-7)
- 1-(4-{[5-(2-fluorophenyl)-1,2,4-oxadiazol-3-yl]oxy}phenyl)ethan-1-one (CAS 866150-25-6)
- 1-(6-(4-Fluorophenyl)-2-methylpyrimidin-4-yl)-1H-pyrazole-3-carboxylic acid (CAS 1707735-63-4)
- 1-Cyclopropyl-5-(5-fluoro-2-hydroxy-benzoyl)-2-oxo-1,2-dihydro-pyridine-3-carbonitrile (CAS 568553-93-5)
- 3-((2-Chloro-6-fluorobenzyl)oxy)-1-(4-chlorobenzyl)-2-methylpyridin-4(1H)-one (CAS 303144-70-9)
- 4-Bromo-N-(4-methylpyridin-2-yl)benzenesulfonamide (CAS 295345-81-2)
- rel-1,1'-((4R,5R)-2,2-Dimethyl-1,3-dioxolane-4,5-diyl)bis(N,N-dimethylmethanamine) (CAS 305838-78-2)
- trans-3-(3,4-Dimethoxyphenoxy)cyclobutanamine hydrochloride (CAS 1630906-76-1)
- 3,3-Diphenylacrylaldehyde (CAS 13702-35-7)
- 1-Benzyl-4-methyl-1h-pyrazol-3-amine (CAS 1174838-25-5)
- 2,4,6-Trichloro-3-nitropyridine (CAS 60186-13-2)
- 1-Benzyl-4-bromo-1H-pyrazol-5-ol (CAS 1881321-67-0)
- 2-(1H-Pyrazol-1-yl)-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (CAS 2096339-53-4)
- Neuropeptide FF (CAS 99566-27-5)
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