1-(3-Chloropyridin-2-yl)ethan-1-one: Handling & Use Protocol
1-(3-Chloropyridin-2-yl)ethan-1-one: Handling & Use Protocol
1-(3-chloropyridin-2-yl)ethan-1-one is a halogenated heteroaromatic ketone widely employed as a versatile building block in medicinal and synthetic chemistry for the construction of complex nitrogen-containing scaffolds.
- Chemical Name
- 1-(3-Chloropyridin-2-yl)ethan-1-one
- SKU / Catalog Number
- C173299
- Molecular Formula
- C7H6ClNO
- Molecular Weight
- 155.58 g/mol
- CAS Number
- Needs review — not confirmed in source material
- Recommended Storage
- Cool, dry place away from light; seal tightly under inert atmosphere
- Functional Groups
- Aromatic ketone (acetyl), ring chloride on pyridine C-3
Safety Precautions and Personal Protective Equipment
Before working with 1-(3-chloropyridin-2-yl)ethan-1-one, review the current Safety Data Sheet (SDS) supplied with SKU C173299. The compound contains a reactive aromatic chloride and a ketone functionality; treat it as a potential irritant to skin, eyes, and the respiratory tract.
- Gloves: Wear nitrile or neoprene gloves rated for organic solvents.
- Eye protection: Chemical splash goggles are required at all times during handling.
- Respiratory protection: Work inside a well-ventilated fume hood. A half-face respirator with organic vapour cartridge is recommended if fume hood is unavailable.
- Clothing: Wear a lab coat and closed-toe shoes; avoid synthetic fabrics that may melt upon chemical contact.
- Disposal: Collect all waste in a labelled, solvent-compatible container and dispose according to institutional and local regulations for halogenated organic waste.
Review flag: Specific GHS hazard classification and pictograms should be verified against the official SDS for C173299 before finalising this section.
Materials and Equipment
The following materials and equipment are typically required when using 1-(3-chloropyridin-2-yl)ethan-1-one as a synthetic building block:
- 1-(3-Chloropyridin-2-yl)ethan-1-one, SKU C173299 (Aladdin Scientific)
- Anhydrous solvents appropriate to the intended reaction (e.g., DMF, THF, DCM, acetonitrile)
- Inert-gas manifold (Schlenk line or glovebox) for moisture-sensitive transformations
- Calibrated analytical balance (±0.1 mg)
- Appropriate glassware: round-bottom flasks, reflux condenser, magnetic stir bars
- Temperature-controlled heating mantle or oil bath with thermocouple
- Thin-layer chromatography (TLC) supplies and UV lamp for reaction monitoring
- HPLC or GC system for purity verification of product
Step-by-Step Experimental Protocol
The following protocol outlines general best-practice procedures for incorporating 1-(3-chloropyridin-2-yl)ethan-1-one into synthetic transformations. Adapt conditions to the specific reaction being performed.
- Preparation: Confirm reagent identity and purity by reviewing the Certificate of Analysis (CoA) for lot C173299. Weigh the required amount in a fume hood using a tared vial.
- Dissolution: Dissolve the compound in the chosen anhydrous solvent. The compound is anticipated to show reasonable solubility in polar aprotic solvents (DMF, DMSO, acetonitrile) and common chlorinated solvents (DCM, chloroform). Confirm solubility empirically before scale-up.
- Reaction Setup: Transfer the solution to a pre-dried, inert-gas-purged round-bottom flask. Add base, nucleophile, or coupling partner as required by your specific synthetic route. Install a condenser if heating is required.
- Reaction Monitoring: Withdraw aliquots at defined time intervals and analyse by TLC (UV at 254 nm) to monitor conversion. Note the Rf of starting material versus product in your chosen solvent system.
- Work-up: Upon complete conversion, quench the reaction as appropriate (e.g., aqueous wash, neutralisation). Extract the organic layer, dry over anhydrous MgSO4 or Na2SO4, filter, and concentrate under reduced pressure.
- Purification: Purify the crude product by flash column chromatography or recrystallisation, depending on the nature of the product.
- Characterisation: Confirm product identity and purity by NMR (1H, 13C), HRMS, and HPLC.
Note: Specific reaction conditions (temperature, stoichiometry, solvent ratio) must be optimised for each transformation. Consult primary literature for precedent reactions involving 2-acetyl-3-chloropyridine scaffolds.
Storage, Stability, and Quality Control
Proper storage is critical to maintaining the integrity of 1-(3-chloropyridin-2-yl)ethan-1-one over time.
- Temperature: Store at room temperature or as specified on the product label and CoA. Keep away from heat sources and direct sunlight.
- Container: Keep the original container tightly sealed under an inert atmosphere (nitrogen or argon) to prevent moisture ingress and potential hydrolysis of the ketone or displacement of the aryl chloride under forcing conditions.
- Moisture sensitivity: Although aryl ketones are generally less moisture-sensitive than acid chlorides, prolonged exposure to humid conditions should be avoided to maintain purity.
- Quality check before use: Compare the appearance (colour, physical state) with the CoA specification. If discolouration or solidification anomalies are observed, re-analyse purity by HPLC or GC before use.
- Shelf life: Verify the expiry date printed on the bottle. Contact Aladdin Scientific technical support if stability data for extended storage periods is required.
Review flag: Exact storage temperature, shelf life, and stability data should be confirmed from the official CoA and SDS for lot C173299.
Frequently asked questions
What solvents are recommended for dissolving 1-(3-chloropyridin-2-yl)ethan-1-one?
Polar aprotic solvents such as DMF, DMSO, and acetonitrile, as well as chlorinated solvents like DCM and chloroform, are generally suitable for dissolving heteroaromatic ketones of this type. Empirical solubility testing is recommended before committing to large-scale reactions.
What types of chemical reactions is 1-(3-chloropyridin-2-yl)ethan-1-one commonly used in?
This compound serves as a bifunctional building block offering two reactive sites: the electrophilic ketone carbonyl, which can participate in condensation, nucleophilic addition, and enamine-forming reactions, and the aryl chloride at C-3 of the pyridine ring, which is amenable to nucleophilic aromatic substitution (SNAr) and transition-metal-catalysed cross-coupling reactions such as Suzuki or Buchwald-Hartwig couplings. It is frequently used in the synthesis of pharmaceutical intermediates and heterocyclic scaffolds.
How should I confirm the purity of 1-(3-chloropyridin-2-yl)ethan-1-one before use?
Review the Certificate of Analysis (CoA) provided with SKU C173299, which lists the lot-specific purity data. If independent verification is required, analyse a small aliquot by HPLC (reverse-phase C18 column, UV detection at 254 nm) or by GC. 1H NMR in CDCl3 or DMSO-d6 is also a standard confirmatory technique for identity and purity assessment.
Is 1-(3-chloropyridin-2-yl)ethan-1-one sensitive to air or moisture?
Aryl ketones are generally stable under ambient conditions, but prolonged exposure to moisture can degrade purity over time. To ensure long-term stability, store the compound in a tightly sealed container under an inert atmosphere (nitrogen or argon) and avoid repeated freeze-thaw cycles or exposure to humid laboratory air.
Where can I obtain the Safety Data Sheet (SDS) for SKU C173299?
The SDS for 1-(3-chloropyridin-2-yl)ethan-1-one (SKU C173299) is available for download from the Aladdin Scientific product page. You may also contact Aladdin Scientific customer support directly to request the document. Always ensure you are using the most current version of the SDS before beginning work.
References
- Aladdin Scientific. Product page and Certificate of Analysis for 1-(3-Chloropyridin-2-yl)ethan-1-one, SKU C173299. Aladdin Scientific, Shanghai.
- March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, 4th ed.; Wiley-Interscience: New York, 1992. General reference for nucleophilic aromatic substitution and ketone reactivity.
- Clayden, J.; Greeves, N.; Warren, S. Organic Chemistry, 2nd ed.; Oxford University Press: Oxford, 2012. Textbook reference for heteroaromatic chemistry and carbonyl reactions.
Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.
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