4,5-Dichloropyridin-2(1H)-one CAS 856965-66-7
| CAS No. | 856965-66-7 |
| Molecular Formula | C5H3Cl2NO |
| Molecular Weight | 163.99 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
4,5-Dichloropyridin-2(1H)-one (CAS 856965-66-7), molecular formula C5H3Cl2NO and molecular weight 163.99 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to an amide group, a hydroxyl group, an ether linkage, chlorine substitution, 4,5-Dichloropyridin-2(1H)-one is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 163.99 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
CATO manufactures 4,5-Dichloropyridin-2(1H)-one under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C5H3Cl2NO |
| Molecular Weight | 163.99 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, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1987 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
Related Dichloropyridin Standards
- 4,6-Dichloropyridin-3-ol (CAS 1196157-47-7)
- 4,5-Dichloropyridin-3-ol (CAS 1261269-63-9)
- 3,5-Dichloropyridin-4(1H)-one (CAS 17228-70-5)
- 2,4-Dichloropyridin-3-ol (CAS 405141-76-6)
- 2,6-Dichloropyridin-4(1H)-one (CAS 253435-44-8)
- 3,5-Dichloropyridin-2(1H)-one (CAS 5437-33-2)
- 3,6-Dichloropyridin-2(1H)-one (CAS 57864-39-8)
- 5,6-Dichloropyridin-2-amine (CAS 1192814-45-1)
Recommended Standards
- 4,5-Dichloropyrimidin-2-amine (CAS 403854-21-7)
- 4-Amino-2,5-dichloropyrimidine (CAS 89180-51-8)
- 3,5-Dichloro-2-pyrazinamine (CAS 873-42-7)
- 4-Amino-3,5-dichloropyridazine (CAS 53180-76-0)
- 2-Chloro-9-(tetrahydro-2H-pyran-4-yl)-8,9-dihydro-5H-pyrimido[4,5-b][1,4]diazepin-6(7H)-one (CAS 1807542-93-3)
- n-(4-Hydroxyphenyl)-2-methoxybenzamide (CAS 54090-25-4)
- 7-(P-tolyl)-[1,2,4]triazolo[1,5-a]pyrimidine-2-carboxylic acid (CAS 1018125-61-5)
- 2,3-Diaminosuccinic acid (CAS 921-52-8)
- Methyl (R)-2-(4-Methylphenylsulfonamido)-2-phenylacetate (CAS 111047-53-1)
- 2-(Piperazin-1-yl)nicotinamide dihydrochloride (CAS 87394-52-3)
- Ethyl 2-isothiocyanato-5-methyl-4-phenylthiophene-3-carboxylate (CAS 861239-52-3)
- 3-(3-Acetylphenyl)phenol (CAS 365427-02-7)
- 2-Bromo-4-trifluoromethoxythioanisole (CAS 951884-71-2)
- Semaglutide impurity 256 (CAS CATO-C4X-2226256)
Why CATO?
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