5-Chloro-[1,2,4]triazolo[4,3-a]pyrazine CAS 63744-34-3
| CAS No. | 63744-34-3 |
| Molecular Formula | C5H3ClN4 |
| Molecular Weight | 154.56 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
5-Chloro-[1,2,4]triazolo[4,3-a]pyrazine (CAS 63744-34-3) is a high-purity analytical reference standard with the molecular formula C5H3ClN4 and a molecular weight of 154.56 g/mol.
Owing to a nitrile group, chlorine substitution, 5-Chloro-[1,2,4]triazolo[4,3-a]pyrazine is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 154.56 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
As a certified reference material (CRM), 5-Chloro-[1,2,4]triazolo[4,3-a]pyrazine 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 | C5H3ClN4 |
| Molecular Weight | 154.56 g/mol |
| Appearance | Off-white to pale 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) | 6.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1975 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 4 |
Related Chloro Standards
- 3-chloro-[1,2,4]triazolo[4,3-a]pyrimidine (CAS 1020036-31-0)
- 4-Chloro-1H-imidazo[4,5-d]pyridazine (CAS 1083181-53-6)
- 6-Chloro-7H-purine (CAS 111055-92-6)
- 7-Chloro-[1,2,4]triazolo[1,5-c]pyrimidine (CAS 1159811-23-0)
- 5-Chloro-1H-pyrazolo[3,4-b]pyrazine (CAS 116527-52-7)
- 5-Chloro-1H-imidazo[4,5-b]pyrazine (CAS 1196151-76-4)
- 6-Chloro-3H-[1,2,3]triazolo[4,5-c]pyridine (CAS 120641-09-0)
- 8-Chloro-[1,2,4]triazolo[4,3-c]pyrimidine (CAS 1208083-81-1)
Recommended Standards
- 5-Chloro-[1,2,4]triazolo[1,5-c]pyrimidine, 97% (CAS 76044-36-5)
- 6-Amino-2-chloropyrimidine-4-carbonitrile (CAS 64376-18-7)
- 5-Chloro-[1,2,4]triazolo[1,5-a]pyrazine (CAS 42399-82-6)
- 6-chloro-[1,2,4]triazolo[1,5-a]pyrimidine (CAS 65528-29-2)
- ((6-Bromo-2-methoxynaphthalen-1-yl)methyl)hydrazine (CAS 1420793-25-4)
- 6-Chloro-2-(1,4-diazepan-1-yl)benzo[d]oxazole (CAS 1035840-25-5)
- 1-(tert-Butoxy)-3-cyclopropoxy-2-fluorobenzene (CAS 1243356-13-9)
- 6-Amino-2-((4-fluorobenzyl)thio)pyrimidin-4-ol (CAS 401579-89-3)
- 1-(2-Bromophenyl)cyclopropanemethanamine (CAS 886365-59-9)
- 2-bromo-N-(1,1-dioxothiolan-3-yl)-3-methylbutanamide (CAS 1016779-71-7)
- (R)-tert-Butyl (4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]thiazepin-3-yl)carbamate (CAS 440634-12-8)
- Latanoprost Impurity 26 (CAS CATO-C4X-194126)
- 3,5-Difluoro-4-(trifluoromethoxy)phenylboronic acid (CAS 220943-57-7)
- Semaglutide impurity 194 (CAS CATO-C4X-2226194)
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