7-Chloro-5-methylpyrazolo[1,5-a]pyrimidine-3-carbonitrile CAS 138904-34-4
| CAS No. | 138904-34-4 |
| Molecular Formula | C8H5ClN4 |
| Molecular Weight | 192.61 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
7-Chloro-5-methylpyrazolo[1,5-a]pyrimidine-3-carbonitrile (CAS 138904-34-4), molecular formula C8H5ClN4 and molecular weight 192.61 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C8H5ClN4, 7-Chloro-5-methylpyrazolo[1,5-a]pyrimidine-3-carbonitrile contains a nitrogen-containing heterocyclic scaffold, a nitrile group, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 192.61 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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.
Physical & Chemical Properties
| Molecular Formula | C8H5ClN4 |
| Molecular Weight | 192.61 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| 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.) | 1996 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 4 |
Related Chloro Standards
- 2-Chloro-4-(pyridin-4-yl)-1,3,5-triazine (CAS 1053656-00-0)
- 2-Chloro-4-(pyridin-3-yl)-1,3,5-triazine (CAS 1053656-03-3)
- 4-Chloro-2-(pyrimidin-2-yl)pyrimidine (CAS 1155594-91-4)
- 6-Chloro-1-methyl-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile (CAS 1216269-91-8)
- 5-Chloro-3-methylimidazo[1,5-c]pyrimidine-7-carbonitrile (CAS 1352881-06-1)
- 2-Chloro-4-(pyrazin-2-yl)pyrimidine (CAS 1543236-38-9)
- 4-Chloro-2-methyl-7H-pyrrolo[2,3-d]pyrimidine-5-carbonitrile (CAS 1558472-65-3)
- 4-Chloro-7-methyl-7H-pyrrolo[2,3-d]pyrimidine-2-carbonitrile (CAS 1638763-85-5)
Recommended Standards
- 2,2-difluorobutane-1-sulfonyl chloride (CAS 1780685-02-0)
- 4,4-Difluorobutane-1-sulfonyl chloride (CAS 1785613-49-1)
- 2-Chloro-1,4-naphthoquinone (CAS 1010-60-2)
- 3,3-Difluorobutane-1-sulfonyl chloride (CAS 1785613-55-9)
- 4-Methoxy-2-nitrobenzaldehyde (CAS 22996-21-0)
- Methyl 4-((4-amino-2-chlorophenoxy)methyl)-5-methylisoxazole-3-carboxylate (CAS 886496-90-8)
- Phenyl(tetrahydro-2H-pyran-4-yl)methanamine (CAS 1197006-60-2)
- 2-(2-Bromo-5-chlorophenyl)ethan-1-ol (CAS 947614-94-0)
- 3-(isoquinolin-4-yl)-2-methylpropanoic acid hydrochloride (CAS 1803595-21-2)
- Loliolid (CAS 5989-02-6)
- Serotonin azidobenzamidine, >98% (HPLC) (CAS 98409-42-8)
- 2-(4-Bromo-2,3-dimethylphenyl)-1,3-dioxolane (CAS 2221812-47-9)
- Methyl 2-(3-(2-methoxyphenyl)-1H-1,2,4-triazol-1-yl)acetate (CAS 1416347-61-9)
- Semaglutide impurity 49 (CAS CATO-C4X-222649)
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