TCI C0826 2-Chlorophenylhydrazine Hydrochloride (CAS 41052-75-9) is a stable, easy-to-weigh salt form of an ortho-chlorinated arylhydrazine, available in 25 g and 100 g packs. It condenses readily with aldehydes and ketones to give hydrazones and is a classical starting material for Fischer indole synthesis and pyrazole formation. The chlorine substituent carries a defined substitution pattern into the final heterocycle, which is valuable in structure–activity studies. Weigh and transfer the solid in a fume hood with gloves and eye protection, and store it tightly closed in a cool, dry, dark place.
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