4-Chloro-2-methyl-5,6,7,8-tetrahydro-benzo[4,5]thieno[2,3-d]pyrimidine CAS 81765-97-1
| CAS No. | 81765-97-1 |
| Molecular Formula | C11H11ClN2S |
| Molecular Weight | 238.74 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 4-Chloro-2-methyl-5,6,7,8-tetrahydro-benzo[4,5]thieno[2,3-d]pyrimidine (CAS 81765-97-1), a certified reference material (molecular formula C11H11ClN2S, MW 238.74 g/mol) for analytical method development and quality control.
Owing to a nitrogen-containing heterocyclic scaffold, a nitrile group, sulfur-containing functionality, chlorine substitution, 4-Chloro-2-methyl-5,6,7,8-tetrahydro-benzo[4,5]thieno[2,3-d]pyrimidine is typically off-white to pale yellow low-melting solid. Its solid-state physicochemical attributes — including a molecular weight of 238.74 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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-Chloro-2-methyl-5,6,7,8-tetrahydro-benzo[4,5]thieno[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 | C11H11ClN2S |
| Molecular Weight | 238.74 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) | 7.0 |
| 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
- 5-(2-chloro-3-methylbenzyl)-1,3-thiazol-2-amine (CAS 1000931-88-3)
- 2-Chloro-4-methyl-N-(thiazol-5-ylmethyl)aniline (CAS 1339873-13-0)
- 4-Chloro-2-methyl-N-(thiazol-5-ylmethyl)aniline (CAS 1341170-78-2)
- 4-Chloro-2-cyclopropyl-6-ethylthieno[2,3-d]pyrimidine (CAS 1341276-10-5)
- 3-Chloro-2-methyl-N-(thiazol-5-ylmethyl)aniline (CAS 1342529-17-2)
- 5-Chloro-2-methyl-N-(thiazol-5-ylmethyl)aniline (CAS 1343815-55-3)
- 3-Chloro-4-methyl-N-(thiazol-5-ylmethyl)aniline (CAS 1343928-83-5)
- 4-Chloro-7-methyl-5,6,7,8-tetrahydrobenzo[4,5]thieno[2,3-d]pyrimidine (CAS 137438-23-4)
Recommended Standards
- 4-Chloro-2-ethyl-6,7-dihydro-5H-cyclopenta[4,5]thieno[2,3-d]pyrimidine (CAS 307343-93-7)
- 4-Chloro-6,7,8,9-tetrahydro-5H-cyclohepta[4,5]thieno[2,3-d]pyrimidine (CAS 40106-58-9)
- 4-[(4-Chlorophenyl)thio]-3,5-dimethyl-1H-pyrazole (CAS 301858-86-6)
- 4-Chloro-6-methyl-5,6,7,8-tetrahydrobenzo[4,5]thieno[2,3-d]pyrimidine (CAS 610279-55-5)
- 3,3-Diethoxypropanimidamide acetate (CAS 2137818-27-8)
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