5-Chloro-2-ethynyl-3-fluoropyridine CAS 1256808-79-3
| CAS No. | 1256808-79-3 |
| Molecular Formula | C7H3ClFN |
| Molecular Weight | 155.56 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 5-Chloro-2-ethynyl-3-fluoropyridine is closely related to a nitrile group, fluorine/chlorine substitution, an aromatic ring system in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
CATO supplies 5-Chloro-2-ethynyl-3-fluoropyridine (CAS 1256808-79-3), a certified reference material (molecular formula C7H3ClFN, MW 155.56 g/mol) for analytical method development and quality control.
Based on its molecular formula C7H3ClFN, 5-Chloro-2-ethynyl-3-fluoropyridine contains a nitrile group, fluorine/chlorine substitution, an aromatic ring system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 155.56 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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), 5-Chloro-2-ethynyl-3-fluoropyridine 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 | C7H3ClFN |
| Molecular Weight | 155.56 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor, low volatility) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO |
| 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.) | 1990 |
| Halogen Content | F/Cl-containing |
| Nitrogen Atoms | 1 |
Related Chloro Standards
- 3-Chloro-2-fluorophenylisocyanide (CAS 1030269-27-2)
- 4-Chloro-3-fluorobenzonitrile (CAS 110888-15-8)
- 3-Chloro-4-fluorobenzonitrile (CAS 117482-84-5)
- 2-Chloro-4-ethynyl-5-fluoropyridine (CAS 1211539-66-0)
- 2-Chloro-4-ethynyl-3-fluoropyridine (CAS 1211589-16-0)
- 2-Chloro-5-ethynyl-3-fluoropyridine (CAS 1256785-45-1)
- 2-Chloro-3-ethynyl-5-fluoropyridine (CAS 1256789-32-8)
- 2-Chloro-5-ethynyl-4-fluoropyridine (CAS 1824186-68-6)
Recommended Standards
- 4-Chloro-3-ethynyl-5-fluoropyridine (CAS 1824202-13-2)
- 1-Chloro-4-Fluoro-1-Nitrobutane (CAS 63732-17-2)
- 2-Chloro-3-fluorobenzonitrile (CAS 874781-08-5)
- 2-Chloro-5-fluorobenzonitrile (CAS 57381-56-3)
- 4-Hydroxy-2-methyl-7-azaindole (CAS 888721-34-4)
- 2-(3-(Trifluoromethyl)benzyl)piperidine hydrochloride (CAS 782504-66-9)
- 3-Chloro-2-fluoro-4-nitrophenol (CAS 1805115-08-5)
- 1-Nitroanthracene-9,10-dione (CAS 82-34-8)
- 5-Ethoxy-1-propyl-1H-indole-3-carbaldehyde (CAS 1134334-43-2)
- Propyl Lactate (CAS 616-09-1)
- 1-Butoxy-4-chloro-2,3-difluorobenzene (CAS 1881295-19-7)
- 4-(Difluoromethyl)-3-nitroaniline (CAS 1261646-06-3)
- 1-(Benzyloxy)-2-chloro-4-(methoxymethyl)benzene (CAS 2404733-98-6)
- Semaglutide impurity 67 (CAS CATO-C4X-222667)
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