4-chloro-2,5-dimethylthieno[2,3-d]pyrimidine CAS 935843-18-8
| CAS No. | 935843-18-8 |
| Molecular Formula | C8H7ClN2S |
| Molecular Weight | 198.67 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
4-chloro-2,5-dimethylthieno[2,3-d]pyrimidine (CAS 935843-18-8), molecular formula C8H7ClN2S and molecular weight 198.67 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C8H7ClN2S, 4-chloro-2,5-dimethylthieno[2,3-d]pyrimidine contains a nitrogen-containing heterocyclic scaffold, a nitrile group, sulfur-containing functionality, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 198.67 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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 manufactures 4-chloro-2,5-dimethylthieno[2,3-d]pyrimidine 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 | C8H7ClN2S |
| Molecular Weight | 198.67 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1987 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related chloro Standards
- 5-Chloro-2-methylbenzo[d]thiazol-6-amine (CAS 101253-50-3)
- 4-Chloro-5,6-dimethylthieno[2,3-d]pyrimidine (CAS 108831-68-1)
- 6-Chloro-5-methyl-1,2-benzisothiazol-3-amine (CAS 1126424-36-9)
- 4-Chloro-N-methyl-2-benzothiazolamine (CAS 118221-28-6)
- 2-Chloro-6-ethylthieno[2,3-d]pyrimidine (CAS 1225634-75-2)
- 4-Chloro-2,6-dimethylthieno[3,2-d]pyrimidine (CAS 1233025-67-6)
- 4-Chloro-7-methylbenzo[d]thiazol-2-amine (CAS 126920-72-7)
- 4-Chloro-2-methylbenzo[d]thiazol-6-amine (CAS 1369347-68-1)
Recommended Standards
- 2-chloropyridine-3-sulfonamide (CAS 38025-93-3)
- 4-Chloro-2,6-dimethylthieno[2,3-d]pyrimidine (CAS 879873-61-7)
- 2-Chloro-5,6-dimethylthieno[2,3-d]pyrimidine (CAS 83259-32-9)
- 4-Chloro-2-methylbenzo[d]thiazol-5-amine (CAS 686747-15-9)
- Ketorolac Trometamol (CAS 74103-07-4)
- tert-butyl 2-(2-aminoethyl)-1,2,3,4-tetrahydroquinoline-1-carboxylate (CAS 1955523-55-3)
- 7-Methoxy-1H-imidazo[4,5-c]pyridine (CAS 1312440-87-1)
- Methyl 3-ethylpiperidine-3-carboxylate (CAS 1206228-73-0)
- 7-Chloro-5-(trifluoromethyl)-1h-pyrrolo[2,3-c]pyridine (CAS 945840-70-0)
- 1-(2-Chlorophenyl)-4-(5,5-dimethyl-1,3-dioxan-2-yl)butan-1-one (CAS 898785-86-9)
- 8-Bromo-3-fluoroisoquinoline (CAS 2385645-21-4)
- (Sa,S,S)-iPr-SpiroBOX (CAS 940880-71-7)
- 6-Amino-5-(bromomethyl)-2-(difluoromethyl)pyridin-3-ol (CAS 1805214-06-5)
- Semaglutide impurity 215 (CAS CATO-C4X-2226215)
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