Chemical Identity and Physical Properties

(2-Chloro-6-fluorophenyl)hydrazine hydrochloride (SKU: C193772) is an arylhydrazine salt characterized by a phenyl ring bearing both a chloro substituent at the 2-position and a fluoro substituent at the 6-position, with the hydrazine moiety protonated as the hydrochloride salt. The hydrochloride salt form confers improved stability compared to the free base, making it easier to handle, weigh, and store in routine laboratory settings.

The compound typically appears as a solid powder. The presence of two electronegative halogens in ortho positions relative to each other imparts distinctive electronic and steric properties to the aryl ring, influencing both its reactivity in condensation reactions and its physicochemical behavior. As with most arylhydrazine salts, it is expected to be hygroscopic; therefore, careful moisture control during storage is important to preserve reagent integrity.

Synthetic Applications and Reactivity

Arylhydrazines are cornerstone reagents in heterocyclic chemistry. (2-Chloro-6-fluorophenyl)hydrazine hydrochloride participates in classical condensation reactions with 1,3-dicarbonyl compounds, β-ketoesters, and aldehydes to generate pyrazole and pyrazolinone scaffolds. These nitrogen-containing heterocycles are highly prevalent in biologically active molecules and pharmaceutical candidates.

The ortho-chloro and ortho-fluoro substituents introduce steric constraint around the nitrogen–aryl bond and modulate the nucleophilicity of the terminal amine nitrogen. This electronic tuning can be exploited to control regioselectivity in ring-closure reactions, making this reagent particularly valuable for synthesizing specifically substituted heterocyclic targets. In addition, the halogens themselves (especially fluorine) can serve as handles for subsequent cross-coupling reactions such as Suzuki–Miyaura or Buchwald–Hartwig amination, enabling rapid diversification of the product library.

Researchers working on indazole or triazine formation may also employ this compound as a starting material, leveraging the proximal halogen substituents for intramolecular cyclization strategies.

Handling, Safety, and Storage Guidelines

As a hydrazine derivative, (2-Chloro-6-fluorophenyl)hydrazine hydrochloride should be treated with appropriate caution. Hydrazine compounds are generally considered potentially toxic and may be irritating to skin, eyes, and the respiratory tract. Personnel should work in a well-ventilated fume hood, wear appropriate personal protective equipment (nitrile gloves, safety glasses, and a lab coat), and avoid inhalation of dust or aerosols.

The compound should be stored in a tightly sealed container in a cool, dry location away from moisture, direct light, strong oxidizers, and strong acids or bases. Given its hygroscopic character, desiccant storage (e.g., with silica gel) is recommended. Upon receipt, inspect the container for integrity and document the lot number for traceability.

Disposal should follow institutional and local regulatory guidelines for halogenated organic compounds. Always consult the current Safety Data Sheet (SDS) provided by Aladdin Scientific for authoritative hazard classifications and first-aid measures before use.

Quality, Purity, and Procurement Considerations

For reproducible synthetic outcomes, reagent purity is critical. When ordering (2-Chloro-6-fluorophenyl)hydrazine hydrochloride (C193772) from Aladdin Scientific, researchers should confirm the stated purity specification on the product page and certificate of analysis (CoA). Common analytical techniques used to verify purity of arylhydrazine hydrochlorides include HPLC, NMR spectroscopy (¹H and ¹³C), and elemental analysis.

Lab managers and procurement teams should note that the reagent is intended for research use only and is not approved for clinical, diagnostic, or food applications. Quantity requirements should be evaluated against projected experiment timelines, as prolonged storage of opened containers may lead to degradation. Purchasing in research-appropriate lot sizes and maintaining proper inventory records will help ensure consistent reagent quality across experiments.

Contact Aladdin Scientific's technical support team for bulk pricing, custom packaging inquiries, or questions regarding certificate of analysis documentation.