Aniline to phenyl hydrazine
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. Phenylhydrazine is prepared by oxidizing aniline with sodium nitrite in the presence of hydrogen chloride to form the diazonium salt, which is subsequently reduced using sodium sulfite in the presence of sodium hydroxide to form the final product.
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(ammonia) NH3 + sodium nitrite( NaNO2) + (hydrogen chloride) HCl ---> (benzene nitrogen chloride) C6H5N2Cl +SaCl2 --> (phenyl hydrazine) C6H5NH-H2N
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