4-Bromo-5-chloro-1-methyl-1H-pyrazole CAS 1350323-81-7
| CAS No. | 1350323-81-7 |
| Molecular Formula | C4H4BrClN2 |
| Molecular Weight | 195.44 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.
CATO supplies 4-Bromo-5-chloro-1-methyl-1H-pyrazole (CAS 1350323-81-7), a certified reference material (molecular formula C4H4BrClN2, MW 195.44 g/mol) for analytical method development and quality control.
Structurally, 4-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. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
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.) | 1991 |
| Halogen Content | Cl/Br-containing |
| Nitrogen Atoms | 2 |
Related Bromo Standards
- 4-Bromo-3-chloro-1-methyl-1H-pyrazole (CAS 1350323-83-9)
- 5-Bromo-4-chloro-1-methyl-1H-pyrazole (CAS 1521372-90-6)
- 3-Bromo-5-chloro-1-methyl-1H-pyrazole (CAS 1785538-05-7)
- 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)
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- (5-Chloro-1H-indol-2-yl)boronic acid (CAS 282528-62-5)
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