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2-Nitrotoluene

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2-Nitrotoluene
Names
Preferred IUPAC name 1-Methyl-2-nitrobenzene
Other names o-Nitrotoluene, o-Methylnitrobenzene, 2-Methylnitrobenzene, ortho-Nitrotoluene
Identifiers
CAS Number
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.001.685 Edit this at Wikidata
EC Number
  • 201-853-3
KEGG
PubChem CID
RTECS number
  • XT3150000
UNII
UN number 1664
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C7H7NO2/c1-6-4-2-3-5-7(6)8(9)10/h2-5H,1H3Key: PLAZTCDQAHEYBI-UHFFFAOYSA-N
  • InChI=1S/C7H7NO2/c1-6-4-2-3-5-7(6)8(9)10/h2-5H,1H3Key: PLAZTCDQAHEYBI-UHFFFAOYSA-N
  • InChI=1S/C7H7NO2/c1-6-4-2-3-5-7(6)8(9)10/h2-5H,1H3
SMILES
  • Cc1ccccc1(=O)
Properties
Chemical formula C7H7NO2
Molar mass 137.138 g·mol
Appearance yellow liquid
Odor weak, aromatic
Density 1.1611 g·cm @ 19°C
Melting point −10.4 °C (13.3 °F; 262.8 K)
Boiling point 222 °C (432 °F; 495 K)
Solubility in water 0.07% (20°C)
Vapor pressure 0.1 mmHg (20°C)
Magnetic susceptibility (χ) -72.28·10 cm/mol
Hazards
GHS labelling:
Pictograms GHS07: Exclamation markGHS08: Health hazardGHS09: Environmental hazard
Signal word Danger
Hazard statements H302, H340, H350, H361, H411
Precautionary statements P201, P202, P264, P270, P273, P281, P301+P312, P308+P313, P330, P391, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
3 1 1
Flash point 106 °C; 223 °F; 379 K
Explosive limits 2.2%-?
Lethal dose or concentration (LD, LC):
LD50 (median dose) 891 mg/kg (oral, rat)
970 mg/kg (oral, mouse)
1750 mg/kg (oral, rabbit)
NIOSH (US health exposure limits):
PEL (Permissible) TWA 5 ppm (30 mg/m)
REL (Recommended) TWA 2 ppm (11 mg/m)
IDLH (Immediate danger) 200 ppm
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

2-Nitrotoluene or ortho-nitrotoluene is an organic compound with the formula CH3C6H4NO2. It is pale yellow liquid that crystallizes in two forms, called α (−9.27 °C) and β (−3.17 °C). It is mainly a precursor to o-toluidine, which is an intermediate in the production of various dyes.

Synthesis and reactions

It is made by nitrating toluene at above -10 °C. This reaction affords a 2:1 mixture of 2-nitro and 4-nitro isomers.

Chlorination of 2-nitrotoluene gives two isomers of the chloronitrotoluenes. Similarly nitration gives two isomers of dinitrotoluene.

2-Nitrotoluene is mainly consumed in the production of o-toluidine, a precursor to dyes.

References

  1. ^ NIOSH Pocket Guide to Chemical Hazards. "#0462". National Institute for Occupational Safety and Health (NIOSH).
  2. ^ Lide DR, ed. (2004). CRC handbook of chemistry and physics: a ready-reference book of chemical and physical data (85 ed.). Boca Ratan Florida: CRC Press. ISBN 0-8493-0485-7.
  3. "Nitrotoluene (o-, m-, p-isomers)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  4. ^ Gerald Booth (2007). "Nitro Compounds, Aromatic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a17_411. ISBN 978-3527306732.

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