4,5-Dibromo-2-methylpyridazin-3(2H)-one CAS 13645-74-4
| CAS No. | 13645-74-4 |
| Molecular Formula | C5H4Br2N2O |
| Molecular Weight | 267.91 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4,5-Dibromo-2-methylpyridazin-3(2H)-one (CAS 13645-74-4) is a high-purity analytical reference standard with the molecular formula C5H4Br2N2O and a molecular weight of 267.91 g/mol.
Owing to an amide group, a hydroxyl group, an ether linkage, bromine substitution, 4,5-Dibromo-2-methylpyridazin-3(2H)-one is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 267.91 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.
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 | C5H4Br2N2O |
| Molecular Weight | 267.91 g/mol |
| Appearance | Off-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) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1960 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
Related Dibromo Standards
- 3,5-Dibromo-2-methoxypyrazine (CAS 1207853-31-3)
- 2,5-Dibromo-3-methoxypyrazine (CAS 489431-66-5)
- 2,5-Dibromo-4-methoxypyrimidine (CAS 89284-12-8)
- 3,5-Dibromo-1-methylpyrazin-2-one (CAS 87486-34-8)
- 4,5-Dibromo-1-methyl-1H-imidazole-2-carbaldehyde (CAS 79326-92-4)
- 3,4-Dibromo-5-fluorotoluene (CAS 1000576-19-1)
- 1,4-Dibromo-2-fluoro-3-methylbenzene (CAS 1000576-44-2)
- 1,2-Dibromo-5-fluoro-3-methylbenzene (CAS 1000576-64-6)
Recommended Standards
- (3,6-Dibromopyrazin-2-yl)methanol (CAS 1270497-52-3)
- 2-Amino-3,5-dibromopyridin-4-ol (CAS 1261269-58-2)
- 4,5-Dibromofuran-2-carboximidamide (CAS 1247444-20-7)
- 3,5-Dibromopyrazine-2,6-diamine (CAS 58885-20-4)
- 5-Chloro-2,4-dimethoxybenzoic acid (CAS 23053-81-8)
- 2-[(4-bromo-2-nitrophenyl)amino]-2-methylpropanoic acid (CAS 1293197-77-9)
- 6'-(4-Chlorophenyl)-2,4-dihydrospiro[1-benzothiopyran-3,3'-[1,5]dioxane]-4-one (CAS 338755-71-8)
- 2-(4-(Benzo[d][1,3]dioxol-5-yl)thiazol-2-yl)-3-(3,4,5-trimethoxyphenyl)acrylonitrile (CAS 683250-83-1)
- Phytomenadione/Vitamin K1 Impurity 87 (CAS CATO-C4X-220787)
- Levothyroxine EP Impurity D (CAS 67-30-1)
- N,N'-((3aR,4S,7R,7aS)-5-(hydroxymethyl)-2,2-dimethyl-3a,4,7,7a-tetrahydrobenzo[d][1,3]dioxole-4,7-diyl)dibenzamide (CAS 1998128-26-9)
- Zolpidem Impurity 1 (CAS 109461-64-5)
- 1-(2-Methoxyethyl)pyrrolidin-3-one (CAS 1096881-66-1)
- D-Gln19-Tirzepatide (CAS CATO-CPTD788915)
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