TCI C0258 4-Chlorophenylhydrazine Sulfate (CAS 14581-21-6) is an arylhydrazine building block supplied as its sulfate salt for convenient handling in the laboratory. It is widely used in Fischer indole synthesis, hydrazone formation, and the construction of pyrazole-type ring systems from 1,3-dicarbonyl partners. The para-chloro substituent provides a useful handle for further functionalisation in medicinal chemistry research. Available in 25 g and 500 g packs, it suits both exploratory reaction screening and routine synthetic work.
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