3-Bromo-5-chloro-1-methyl-1H-pyrazole CAS 1785538-05-7
| CAS No. | 1785538-05-7 |
| Molecular Formula | C4H4BrClN2 |
| Molecular Weight | 195.44 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 3-Bromo-5-chloro-1-methyl-1H-pyrazole is closely related to a nitrile group, chlorine/bromine substitution in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
3-Bromo-5-chloro-1-methyl-1H-pyrazole (CAS 1785538-05-7) is a high-purity analytical reference standard with the molecular formula C4H4BrClN2 and a molecular weight of 195.44 g/mol.
Structurally, 3-Bromo-5-chloro-1-methyl-1H-pyrazole (C4H4BrClN2) contains a nitrile group, chlorine/bromine substitution. The molecule exhibits a degree of unsaturation (DBE) of 3.0, corresponding to approximately 3 ring(s) or double-bond equivalent(s). With a molecular weight of 195.44 g/mol, it falls into the medium-molecular-weight range. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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), 3-Bromo-5-chloro-1-methyl-1H-pyrazole 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 | C4H4BrClN2 |
| Molecular Weight | 195.44 g/mol |
| Appearance | White to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor, low volatility) |
| 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) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1994 |
| Halogen Content | Cl/Br-containing |
| Nitrogen Atoms | 2 |
Related Bromo Standards
- 4-Bromo-5-chloro-1-methyl-1H-pyrazole (CAS 1350323-81-7)
- 4-Bromo-3-chloro-1-methyl-1H-pyrazole (CAS 1350323-83-9)
- 5-Bromo-4-chloro-1-methyl-1H-pyrazole (CAS 1521372-90-6)
- 4-Bromo-5-chloro-1-methyl-1H-imidazole (CAS 1864014-40-3)
- 2-Bromo-5-(chloromethyl)furan (CAS 337914-79-1)
- 3-Bromo-4-chloro-5-methyl-1H-pyrazole (CAS 740807-52-7)
- 4-Bromo-1-(chloromethyl)-1H-pyrazole (CAS 861001-09-4)
- 4-Bromo-3-chloro-5-methyl-1H-pyrazole (CAS 93233-19-3)
Recommended Standards
- (7-Chloro-1H-indol-4-yl)boronic acid (CAS 948592-94-7)
- (5-Chloro-1H-indol-6-yl)boronic acid (CAS 948593-04-2)
- (5-Chloro-1H-indol-2-yl)boronic acid (CAS 282528-62-5)
- 5-Bromo-2-(chloromethyl)-1H-imidazole (CAS 2169055-08-5)
- 2-Amino-5-cyclopropoxy-N-methylisonicotinamide (CAS 1243449-12-8)
- (2Z)-3-[4-(2,4-Dichlorophenyl)-7-thia-2,5-diazatricyclo[6.4.0.0^{2,6}]dodeca-1(8),3,5-trien-3-yl]-2-[3-(trifluoromethyl)phenyl]prop-2-enenitrile (CAS 478041-77-9)
- 3-((3-Methylbenzyl)thio)-1H-1,2,4-triazole (CAS 307545-27-3)
- 4-(3,5-Dimethyl-4-pyrazolyl)benzoic Acid (CAS 185252-69-1)
- Etoricoxib Impurity 4 (CAS 4052-30-6)
- 5-Chloro-1-[3-chloro-5-(trifluoromethyl)pyridin-2-yl]-N-hydroxy-2-oxo-1,2-dihydropyridine-3-carboximidamide (CAS 1823184-12-8)
- N,N,4-trimethylnaphthalen-1-amine (CAS 4523-52-8)
- 2-((3-Bromophenoxy)methyl)-1,3-dichlorobenzene (CAS 1039822-05-3)
- methyl 2,3-dimethyl-2H-indazole-6-carboxylate (CAS 1638764-86-9)
- (His32,Leu34)-Neuropeptide Y (32-36) (CAS 168916-68-5)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com