3-(5-Bromothiophen-2-yl)-5-methyl-1H-pyrazole CAS 1042767-99-6
| CAS No. | 1042767-99-6 |
| Molecular Formula | C8H7BrN2S |
| Molecular Weight | 243.12 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
3-(5-Bromothiophen-2-yl)-5-methyl-1H-pyrazole (CAS 1042767-99-6), molecular formula C8H7BrN2S and molecular weight 243.12 g/mol, is a CATO reference standard with documented purity and traceability.
3-(5-Bromothiophen-2-yl)-5-methyl-1H-pyrazole (C8H7BrN2S) contains a nitrogen-containing heterocyclic scaffold, a nitrile group, sulfur-containing functionality, bromine 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C8H7BrN2S |
| Molecular Weight | 243.12 g/mol |
| 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1988 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Bromothiophen Standards
- 3-(3-Bromothiophen-2-yl)-5-methyl-1H-pyrazole (CAS 1025026-54-3)
- 1-(5-bromothiophen-2-yl)cyclobutane-1-carbonitrile (CAS 1514316-53-0)
- 3-(5-bromothiophen-2-yl)-1H-pyrazol-5-amine (CAS 502133-10-0)
- N-(1-(5-bromothiophen-2-yl)ethyl)prop-2-yn-1-amine (CAS 1178824-31-1)
- 6-(4-Bromothiophen-2-yl)-2,3,4,5-tetrahydropyridine (CAS 1936094-92-6)
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Recommended Standards
- 5-Bromo-4-methylbenzo[d]thiazol-2-amine (CAS 103873-80-9)
- 5-Bromo-2-methyl-4-thiocyanatoaniline (CAS 1081803-34-0)
- 4-Bromo-2-methylbenzo[d]thiazol-5-amine (CAS 1026012-33-8)
- 2-Bromo-5-methoxybenzo[b]thiophene (CAS 1082769-34-3)
- 3-Bromo-5-iodobenzonitrile (CAS 289039-21-0)
- 4-(Difluoromethyl)-3-fluoro-5-iodopicolinoyl chloride (CAS 1805581-71-8)
- tert-Butyl 4-oxooctahydro-1H-indole-1-carboxylate (CAS 1332584-12-9)
- ((2S,3S)-2-(4-Fluoro-2-methylphenyl)pyrrolidin-3-yl)methanol (CAS 815631-71-1)
- 5-(Bromomethyl)-5'-methyl-2,2'-bipyridine (CAS 117585-58-7)
- 2-(1,3-Oxazol-4-yl)acetonitrile (CAS 1065073-51-9)
- Terbium(III) iodide (CAS 13813-40-6)
- (3,4-Difluoro-5-(4-hydroxypiperidin-1-yl)phenyl)boronic acid (CAS 1704068-71-2)
- 2-Cyano-N-(3-fluorophenyl)-3-(2-methoxyphenyl)acrylamide (CAS 312633-55-9)
- Semaglutide impurity 69 (CAS CATO-C4X-222669)
Why CATO?
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