2-Chloro-5-methylthieno[2,3-d]pyrimidine CAS 83259-31-8
| CAS No. | 83259-31-8 |
| Molecular Formula | C7H5ClN2S |
| Molecular Weight | 184.65 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.
2-Chloro-5-methylthieno[2,3-d]pyrimidine (CAS 83259-31-8), molecular formula C7H5ClN2S and molecular weight 184.65 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C7H5ClN2S, 2-Chloro-5-methylthieno[2,3-d]pyrimidine contains a nitrile group, sulfur-containing functionality, chlorine substitution, an aromatic ring system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 184.65 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).
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 | C7H5ClN2S |
| Molecular Weight | 184.65 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.) | 1980 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Chloro Standards
- 4-Chloro-6-methylthieno[2,3-d]pyrimidine (CAS 106691-21-8)
- 5-chloro-1,3-benzothiazol-4-amine (CAS 1087784-64-2)
- 5-chloro-2-methyl-thiazolo[5,4-b]pyridine (CAS 109202-21-3)
- 4-Chloro-6-methylthiazolo[4,5-c]pyridine (CAS 1159829-49-8)
- 5-Chloro-2-methylthiazolo[4,5-b]pyridine (CAS 118872-73-4)
- 2-Chloro-5-methylthiazolo[5,4-b]pyridine (CAS 1190927-27-5)
- 6-Chloro-3-methylisothiazolo[5,4-b]pyridine (CAS 129211-90-1)
- 2-Chloro-7-methylthieno[3,2-d]pyrimidine (CAS 1355963-58-4)
Recommended Standards
- 2-Chloro-4-thiocyanatoaniline (CAS 3226-47-9)
- 2-Chloro-6-methylthiazolo[4,5-b]pyridine (CAS 960535-45-9)
- 2-Chloro-4-methylthieno[3,2-d]pyrimidine (CAS 952435-11-9)
- 2-Chlorobenzo[d]thiazol-4-amine (CAS 855283-00-0)
- n-[2-(cyclohex-1-en-1-yl)ethyl]-3,5-dimethyl-1,2-oxazole-4-carboxamide (CAS 717857-92-6)
- Sibutramine Hydrochloride (CAS 84485-00-7)
- N-(4'-Formyl[1,1'-biphenyl]-3-yl)acetamide (CAS 400744-75-4)
- 3-cyclopropyl-4-(difluoromethyl)-7-methylisoxazolo[5,4-b]pyridin-6(7H)-one (CAS 1160246-39-8)
- 6-Amino-8-trifluoromethylphenanthridine (CAS 651055-83-3)
- tert-butyl N-[1-(2-oxoethyl)cyclohexyl]carbamate (CAS 1335042-28-8)
- 5-Bromo-1-naphthonitrile (CAS 129278-20-2)
- 4-Cyclobutylpicolinic acid (CAS 1780245-47-7)
- tert-Butyl 3-(3-bromo-7-chloropyrazolo[1,5-a]pyrimidin-5-yl)piperidine-1-carboxylate (CAS 877173-82-5)
- Semaglutide Impurity 150 xTFA (CAS CATO-C4X-2226150)
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