Applications
Phenyl hydrazine is involved in Fischer indole synthesis to prepare indoles, which find application as intermediates in the pharmaceuticals particularly for the tryptamine drug. In analytical chemistry, it is used to differentiate and separate sugars by forming phenyhydrazones. It is used as an N-protecting reagent and for cleavage of phthaloyl group.

Solubility
Soluble in dilute acids.

Notes
Air and light sensitive. Keep the container tightly closed in a dry and well-ventilated place. Incompatible with oxidizing agents.