4-Iodo-1-(methylsulfonyl)-1H-pyrazole CAS 1657012-45-7
| CAS No. | 1657012-45-7 |
| Molecular Formula | C4H5IN2O2S |
| Molecular Weight | 272.06 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.
4-Iodo-1-(methylsulfonyl)-1H-pyrazole (CAS 1657012-45-7), molecular formula C4H5IN2O2S and molecular weight 272.06 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, iodine substitution, 4-Iodo-1-(methylsulfonyl)-1H-pyrazole is typically white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 272.06 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.
Physical & Chemical Properties
| Molecular Formula | C4H5IN2O2S |
| Molecular Weight | 272.06 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, 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; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1993 |
| Halogen Content | I-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Iodo Standards
- 2-IODO-4-FLUOROBENZOIC ACID 4-Fluoro-2-iodobenzoic acid 56096-89-0 AS00944 BENZOIC ACID, 4-FLUORO-2-IODO- BUTTPARK 83\07-33 (CAS 56096-89-0)
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Recommended Standards
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- (R)-5-((tert-Butyldimethylsilyl)oxy)-2-methylpentan-1-amine (CAS 2573871-29-9)
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- 4-(4-Nitro-2-(trifluoromethyl)phenoxy)benzenesulfonyl chloride (CAS 1858255-92-1)
- potassium 4-methyl-5-(2-phenylethyl)-4H-1,2,4-triazole-3-sulfonate (CAS 1864063-19-3)
- (E)-1-phenyl-1H-1,2,3-triazole-4-carbaldehyde O-(4-chlorobenzyl) oxime (CAS 338757-48-5)
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- Tert-butyl (S)-(3-hydroxy-1-(methoxy(methyl)amino)-1-oxopropan-2-yl)carbamate (CAS 122709-20-0)
- 3-Chloro-N-(3-(5,7-dimethylbenzo[d]oxazol-2-yl)-2-methylphenyl)benzamide (CAS 590395-76-9)
- BENZYL (4-(BOC-AMINOMETHYL)PHENYL)CARBAMATE (CAS 326407-36-7)
- Tirzepatide Impurity 61 (CAS CATO-C4X-324061)
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