Phenylhydrazine hydrochloride is used as a selective mannosidase inhibitor. It is used in the study of tyrosine phosphorylation of Janus protein tyrosine kinase (JAKs) in the EPO-responsive normal erythroblastoid cells of anemic mice. It is used in steroid assays and as an N-protecting reagent. Its free base, phenylhydrazine, is used to prepare indoles.
P 1677 (OTTO) Phenyl hydrazine hydrochloride, GR 99%+ Cas 59-88-1 - used to prepare indoles via the Fischer Indole Synthesis, which are intermediates in the synthesis of various dyes.