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Nitrobenzene is an aromatic nitro compound and the simplest of the nitrobenzenes, with the chemical formula C 6 H 5 NO 2. It is a water-insoluble pale yellow oil with an almond -like odor. It freezes to give greenish-yellow crystals.
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.
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The U.S. National Institute for Occupational Safety and Health considers 4-nitrochlorobenzene as a potential occupational carcinogen. [7] The Occupational Safety and Health Administration set a permissible exposure limit of 1 mg/m 3 The American Conference of Governmental Industrial Hygienists recommends an airborne exposure limit of 0.64 mg/m 3 over a time-weighted average of eight hours.
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If the benzene ring contains other substituents, it belongs in Category:Nitrobenzene derivatives Wikimedia Commons has media related to Nitrobenzenes . The main article for this category is Nitrobenzenes .
Its particular effects on human health, such as the long-term results of accidental exposure, have been reported on by news organizations such as The New York Times. For instance, a 2022 article stated that benzene contamination in the Boston metropolitan area caused hazardous conditions in multiple places, with the publication noting that the ...