5-chloro-3-methyl-2H-pyrazolo[4,3-d]pyrimidine CAS 1208863-75-5
| CAS No. | 1208863-75-5 |
| Molecular Formula | C6H13ClN4 |
| Molecular Weight | 176.65 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 5-chloro-3-methyl-2H-pyrazolo[4,3-d]pyrimidine.
5-chloro-3-methyl-2H-pyrazolo[4,3-d]pyrimidine (CAS 1208863-75-5) is a high-purity analytical reference standard with the molecular formula C6H13ClN4 and a molecular weight of 176.65 g/mol.
Based on its molecular formula C6H13ClN4, 5-chloro-3-methyl-2H-pyrazolo[4,3-d]pyrimidine contains a nitrile group, chlorine substitution; these features give the compound characteristic molecular-ion distribution patterns in mass spectrometry. The molecular weight of 176.65 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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.
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 | C6H13ClN4 |
| Molecular Weight | 176.65 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 | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 2.0 |
| CAS Registry Year (est.) | 1990 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 4 |
Related chloro Standards
- 5-chloro-7H-pyrrolo[2,3-d]pyrimidin-4-amine (CAS 1080467-50-0)
- 7-chloro-3-methyl-[1,2,4]triazolo[4,3-c]pyrimidine (CAS 1094292-91-7)
- 6-chloro-1H-pyrazolo[4,3-c]pyridin-3-amine (CAS 1206979-75-0)
- 5-chloro-1H-pyrazolo[3,4-b]pyridin-3-amine (CAS 1245643-75-7)
- 5-chloro-1H-pyrazolo[4,3-b]pyridin-3-amine (CAS 1268522-21-9)
- 5-chloro-3-methyl-triazolo[4,5-b]pyridine (CAS 1353777-54-4)
- 7-chloro-5-methyl-[1,2,4]triazolo[4,3-c]pyrimidine (CAS 1354951-50-0)
- 6-chloro-1-methyl-pyrazolo[3,4-b]pyrazine (CAS 1539296-65-5)
Recommended Standards
- 5-chloropyrazolo[1,5-a]pyrimidin-3-amine (CAS 1234616-50-2)
- 4-chloropyrimido[4,5-d][1,3]diazine (CAS 1197193-18-2)
- 6-chloroimidazo[1,2-b]pyridazin-8-amine (CAS 1161847-36-4)
- 5-(chloromethyl)-1-cyclobutyl-1H-1,2,3,4-tetrazole (CAS 1344114-53-9)
- Bromfenac-d4 Sodium Salt (CAS CATO-C4X-200250)
- Diethyl 2-(((2-chlorophenyl)amino)methylene)malonate (CAS 19056-78-1)
- 1-(4-chlorophenyl)-1H-pyrazol-4-amine (CAS 14044-28-1)
- 2-((M-tolyloxy)methyl)oxirane (CAS 2186-25-6)
- (5-Fluoro-2-oxo-1,2-dihydropyridin-4-yl)boronic acid (CAS 1427305-76-7)
- Ethyl 4-([(4-formyl-2-iodo-6-methoxyphenoxy)acetyl]amino)benzoate (CAS 832674-64-3)
- Tributyl(6-undecylthieno[3,2-b]thiophen-2-yl)stannane (CAS 2304444-54-8)
- TC-G 1005 (CAS 1415407-60-1)
- 1-Chloro-4-(2,2-diethoxyethoxy)benzene (CAS 41964-04-9)
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