4,5-Dichloro-2-methylthieno[2,3-d]pyrimidine CAS 137287-40-2
| CAS No. | 137287-40-2 |
| Molecular Formula | C7H4Cl2N2S |
| Molecular Weight | 219.09 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to a nitrile group, sulfur-containing functionality, chlorine substitution, an aromatic ring system, 4,5-Dichloro-2-methylthieno[2,3-d]pyrimidine is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 219.09 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 4,5-Dichloro-2-methylthieno[2,3-d]pyrimidine (CAS 137287-40-2), a certified reference material (molecular formula C7H4Cl2N2S, MW 219.09 g/mol) for analytical method development and quality control.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 4,5-Dichloro-2-methylthieno[2,3-d]pyrimidine meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C7H4Cl2N2S |
| Molecular Weight | 219.09 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.) | 1996 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Dichloro Standards
- 2,6-Dichloro-4-thiocyanatoaniline (CAS 14030-85-4)
- 4,7-Dichloro-2-methylthieno[3,2-d]pyrimidine (CAS 1823921-18-1)
- 4,7-Dichloro-1,3-benzothiazol-2-amine (CAS 1849-70-3)
- 4,5-Dichloro-benzothiazol-2-ylamine (CAS 1849-71-4)
- 5,6-dichloro-1,3-dihydrobenzimidazole-2-thione (CAS 19462-98-7)
- 2,3-Dichloro-4-thiocyanatoaniline (CAS 7494-03-3)
- 2,4-Dichloro-5-methylthieno[2,3-d]pyrimidine (CAS 56844-38-3)
- 2,4-Dichloro-6-methylthieno[3,2-d]pyrimidine (CAS 35265-82-8)
Recommended Standards
- 3-chloro-1-methyl-1H-pyrazole-4-sulfonyl chloride (CAS 1369123-50-1)
- (4-(Azepan-1-yl)phenyl)boronic acid (CAS 1279027-58-5)
- 4-Chloro-2-(chloromethyl)thieno[3,2-d]pyrimidine (CAS 147005-92-3)
- 6-Chloro-2-(chloromethyl)thiazolo[5,4-b]pyridine (CAS 1256478-41-7)
- 5-Oxo-5-(m-tolyl)pentanoic acid (CAS 36978-51-5)
- 5,6-Dimethoxybenzo[b]thiophene-2-carbohydrazide (CAS 1263215-28-6)
- (2-Benzylthiazol-4-yl)methanamine (CAS 608515-43-1)
- Fmoc-Thr(tBu)-Phe-OH (CAS 1962160-86-6)
- Pisolithin B (CAS 13244-78-5)
- 1,3-Bis(benzo[d][1,3]dioxol-5-yl)prop-2-en-1-one (CAS 76530-89-7)
- N-[3,5-Bis(trifluoromethyl)phenyl]-N'-[(1S,2S)-2-[(11bR)-3,5-dihydro-4H-dinaphth[2,1-c:1',2'-e]azepin-4-yl]-1,2-diphenylethyl]urea (CAS 1428959-93-6)
- 1-[3-(Methylsulfonyl)phenyl]cyclobutylamine (CAS 1314745-81-7)
- 3-Isopropylisonicotinonitrile (CAS 20970-82-5)
- D-Thr7-Tirzepatide (CAS CATO-CPTD788924)
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