Pyrimethamine Impurity 3 CAS 3275-44-3
| CAS No. | 3275-44-3 |
| Molecular Formula | C11H11ClN4 |
| Molecular Weight | 234.68 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to a nitrogen-containing heterocyclic scaffold, a nitrile group, chlorine substitution, Pyrimethamine Impurity 3 is typically pale yellow to yellow low-melting solid. Its solid-state physicochemical attributes — including a molecular weight of 234.68 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
CATO supplies Pyrimethamine Impurity 3 (CAS 3275-44-3), a certified reference material (molecular formula C11H11ClN4, MW 234.68 g/mol) for analytical method development and quality control.
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.
CATO manufactures Pyrimethamine Impurity 3 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C11H11ClN4 |
| Molecular Weight | 234.68 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 4 |
Related Pyrimethamine Standards
- Pyrimethamine Impurity 1 (CAS 772-79-2)
- Pyrimethamine (CAS 58-14-0)
- Pyrimethamine EP Impurity D (CAS 55474-41-4)
- Pyrimethamine-D3 (CAS 1189936-99-9)
- Pyrimethamine EP Impurity A (CAS 55474-40-3)
- Pyrimethamine Impurity 4 (CAS 91284-15-0)
- Pyrimethamine N3-Oxide (CAS CATO-C4X-20441)
- Pyrimethamine EP Impurity C (CAS 140-53-4)
Recommended Standards
- N-allyl-N-(2-chloro-5-cyanophenyl)acetamide (CAS 207992-39-0)
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- N4-Benzyl-6-chloropyrimidine-2,4-diamine (CAS 91066-67-0)
- 325685-59-4 4-Chloro-6-(methoxymethyl)-2-phenylpyrimidine DTXSID60377205 (CAS 325685-59-4)
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- Nimorazole (CAS 6506-37-2)
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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