Phenylhydrazine
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Phenylhydrazine is the chemical compound with the formula C6H5NHNH2. Organic chemists abbreviate the compound PhNHNH2. It was the first hydrazine derivative characterized, being reported by Emil Fischer in 1875.<ref>Fischer, E. "Ueber aromatische Hydrazinverbindungen" Ber. Dtsch. Chem. Ges., 1875, band 8, 589-594.</ref> He prepared it by reduction of a phenyl diazonium salt using sulfite salts. Fischer used PhNHNH2 to characterize sugars via formation of hydrazones with the sugar aldehyde. He also demonstrated in this first paper many of the key properties recognized for hydrazines.
The molecular mass of phenylhydrazine is 108 g/mol.
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