Chemical Structure / July 19, 2018 / Aubrielle Spears
Benzidine is prepared in a two step process from nitrobenzene. First, the nitrobenzene is converted to 1,2-diphenylhydrazine, usually using iron powder as the reducing agent. Treatment of this hydrazine with mineral acids induces a rearrangement reaction to 4,4'-benzidine. Smaller amounts of other isomers are also formed. The benzidine rearrangement, which proceeds intramolecularly, is a classic mechanistic puzzle in organic chemistry.
Here's a list of chemical elements ordered by increasing atomic number. The names and element symbols are provided. Each element has a one or two letter symbol, which is an abbreviated form of its present or old name. The element number is its atomic number, which is the number of protons in each of its atoms.
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