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Nitrobenzene

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Nitrobenzene

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Other names
Nitrobenzol
Oil of mirbane
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98-95-3 7pxY ChEBI CHEBI:27798 7pxY ChEMBL ChEMBL15750 7pxY ChemSpider 7138 7pxY Jmol-3D images Image KEGG C06813 7pxY PubChem Template:Chembox PubChem/format RTECS number DA6475000 Template:Chembox UNII colspan=2 style="background:#f8eaba; border-top:2px solid transparent; border-bottom:2px solid transparent; text-align:center;" #REDIRECTmw:Help:Magic words#Other
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C6H5NO2 Molar mass 123.06 g/mol Appearance yellowish, oily liquid[1] Odor pungent, like paste shoe polish[1] Density 1.199 g/cm3 Melting point Script error: No such module "convert". Boiling point Script error: No such module "convert". 0.19 g/100 ml at 20 °C Vapor pressure 0.3 mmHg (25°C)[1] colspan=2 style="background:#f8eaba; border-top:2px solid transparent; border-bottom:2px solid transparent; text-align:center;" #REDIRECTmw:Help:Magic words#Other
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EU classification Toxic T Highly Flammable F Dangerous for the Environment (Nature) N R-phrases R10, R23/24/25, R40,
R48/23/24, R51/53, R62 S-phrases (S1/2), S28, S36/37,
S45, S61 NFPA 704

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Flash point Script error: No such module "convert". Script error: No such module "convert". Explosive limits 1.8%-?[1] 780 mg/kg (rat, oral)
600 mg/kg (rat, oral)
590 mg/kg (mouse, oral)
[2] US health exposure limits (NIOSH):

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This page is a soft redirect. Related compounds

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Related compounds
Aniline
Benzenediazonium chloride
Nitrosobenzene
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Nitrobenzene is an organic compound with the chemical formula C6H5NO2. It is a water-insoluble pale yellow oil with an almond-like odor. It freezes to give greenish-yellow crystals. It is produced on a large scale from benzene as a precursor to aniline. In the laboratory, it is occasionally used as a solvent, especially for electrophilic reagents.

Production

Nitrobenzene is prepared by nitration of benzene with a mixture of concentrated sulfuric acid, water, and nitric acid. This mixture is sometimes called "mixed acid." The production of nitrobenzene is one of the most dangerous processes conducted in the chemical industry because of the exothermicity of the reaction (ΔH = −117 kJ/mol).[3]

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World capacity for nitrobenzene in 1985 was about 1.7×106 tonnes.[3]

Mechanism of nitration

The nitration process involves formation the nitronium ion (NO2+), followed by an electrophilic aromatic substitution reaction of it with benzene. The nitronium ion is generated in situ by the reaction of nitric acid and an acidic dehydration agent, typically sulfuric acid:

HNO3 + H+ 15px NO2+ + H2O

Uses

Approximately 95% of nitrobenzene is consumed in the production of aniline,[3] which is a precursor to rubber chemicals, pesticides, dyes (particularly azo dyes), explosives, and pharmaceuticals.

Specialized applications

Nitrobenzene is also used in shoe and floor polishes, leather dressings, paint solvents, and other materials to mask unpleasant odors. Redistilled, as oil of mirbane, nitrobenzene has been used as an inexpensive perfume for soaps. A significant merchant market for nitrobenzene is its use in the production of the analgesic paracetamol (also known as acetaminophen) (Mannsville 1991).[4] Nitrobenzene is also used in Kerr cells, as it has an unusually large Kerr constant.

Organic reactions

Aside from its conversion to aniline, nitrobenzene is readily converted to related derivatives such as azobenzene,[5] nitrosobenzene,[6] and phenylhydroxylamine.[7] The nitro- group is deactivating, thus substitution tends to occur at the meta-position.

Safety

Nitrobenzene is highly toxic (Threshold Limit Value 5 mg/m3) and readily absorbed through the skin.

Prolonged exposure may cause serious damage to the central nervous system, impair vision, cause liver or kidney damage, anemia and lung irritation. Inhalation of vapors may induce headache, nausea, fatigue, dizziness, cyanosis, weakness in the arms and legs, and in rare cases may be fatal. The oil is readily absorbed through the skin and may increase heart rate, cause convulsions or rarely death. Ingestion may similarly cause headaches, dizziness, nausea, vomiting and gastrointestinal irritation, loss of sensation/use in limbs and also causes internal bleeding.[6]

Nitrobenzene is considered a likely human carcinogen by the United States Environmental Protection Agency,[8] and is classified by the IARC as a Group 2B carcinogen which is "possibly carcinogenic to humans".[9] It has been shown to cause liver, kidney, and thyroid adenomas and carcinomas in rats.[10]

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "NIOSH Pocket Guide to Chemical Hazards #0450". National Institute for Occupational Safety and Health (NIOSH). 
  2. "Nitrobenzene". Immediately Dangerous to Life and Health. National Institute for Occupational Safety and Health (NIOSH). 
  3. 3.0 3.1 3.2 Gerald Booth (2007). "Nitro Compounds, Aromatic". In: Ullmann's Encyclopedia of Industrial Chemistry. John Wiley & Sons: New York. doi:10.1002/14356007.a17_411
  4. Bhattacharya A.; Purohit V. C.; Suarez, V.; Tichkule, R; Parmer, G.; Rinaldi, F. (2006). "One-step reductive amidation of nitro arenes: application in the synthesis of Acetaminophen". Tetrahedron Letters 47 (11): 1861–1864. doi:10.1016/j.tetlet.2005.09.196. 
  5. Bigelow, H. E.; Robinson, D. B. (1955). "Azobenzene". Org. Synth. ; Coll. Vol. 3, p. 103 
  6. 6.0 6.1 G. H. Coleman, C. M. McCloskey, F. A. Stuart. "Nitrosobenzene". Org. Synth. ; Coll. Vol. 3, p. 668 
  7. O. Kamm. "β-Phenylhydroxylamine". Org. Synth. ; Coll. Vol. 1, p. 445 
  8. http://cfpub.epa.gov/ncea/iris/index.cfm?fuseaction=iris.showQuickView&substance_nmbr=0079
  9. Agents Classified by the IARC Monographs, International Agency for Research on Cancer
  10. National Institutes of Health · U.S. Department of Health and Human Services, Nomination: Nitrobenzene Review committee, 02/02/2010

External links

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