4-Bromo-3,5-dimethyl-1-phenyl-1h-pyrazole CAS 51294-75-8
| CAS No. | 51294-75-8 |
| Molecular Formula | C11H11BrN2 |
| Molecular Weight | 251.12 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 4-Bromo-3,5-dimethyl-1-phenyl-1h-pyrazole (CAS 51294-75-8), a certified reference material (molecular formula C11H11BrN2, MW 251.12 g/mol) for analytical method development and quality control.
Based on its molecular formula C11H11BrN2, 4-Bromo-3,5-dimethyl-1-phenyl-1h-pyrazole contains a nitrogen-containing heterocyclic scaffold, a nitrile group, bromine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 251.12 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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.
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 | C11H11BrN2 |
| Molecular Weight | 251.12 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1971 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
Related Bromo Standards
- (S)-2-Bromo-1-(naphthalen-2-yl)ethan-1-ol (CAS 100306-23-8)
- 3-Bromo-2-(2,5-dimethyl-1H-pyrrol-1-yl)pyridine (CAS 1021910-58-6)
- 4-Bromo-1-methyl-2-(o-tolyl)-1H-imidazole (CAS 1049126-60-4)
- 5-Bromo-1-(4-methylbenzyl)-1H-pyrazole (CAS 1057383-71-7)
- Ethyl 7-bromo-2-oxoheptanoate (CAS 107871-17-0)
- 7-Bromo-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (CAS 108061-47-8)
- 3-bromo-5-(pyrrolidin-1-yl)benzonitrile (CAS 1129541-71-4)
- 2-bromo-3-(1,3-dioxolan-2-yl)phenol (CAS 1160182-45-5)
Recommended Standards
- 4-Bromo-2-(2,5-dimethyl-1H-pyrrol-1-yl)pyridine (CAS 951233-66-2)
- 4-Bromo-5-ethylnaphthalen-2-ol (CAS 2763158-71-8)
- 4-bromo-1-(2-phenylethyl)-1H-pyrazole (CAS 261948-25-8)
- 5-Bromo-2-(2,5-dimethyl-1-pyrrolyl)pyridine (CAS 228710-82-5)
- 3-butoxybenzonitrile (CAS 92367-52-7)
- 7-methoxy-1H-benzimidazole-5-carboxylic acid (CAS 1195408-40-2)
- 2-((3,4-Dimethylphenyl)thio)ethanol (CAS 13290-28-3)
- Ethyl 6-bromo-8-iodoimidazo[1,2-a]pyridine-2-carboxylate (CAS 1296223-95-4)
- (R)-1-(pyridin-4-yl)pyrrolidin-3-ol (CAS 181959-78-4)
- 1-(2-(Cyclopropylamino)-2-oxoethyl)-3,6-dimethyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylic acid (CAS 1011398-12-1)
- 2-Acetylbenzohydrazide (CAS 849338-43-8)
- 7-O-Ethylmorroniside (CAS 945721-10-8)
- 3-[4-(4-Isopropylphenyl)-1-piperazinyl]-3-oxopropanoic acid (CAS 896521-82-7)
- Semaglutide impurity 98 (CAS CATO-C4X-222698)
Why CATO?
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