4-Nitrotoluene
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| Names | |
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| Preferred IUPAC name
1-Methyl-4-nitrobenzene | |
| Other names
p-nitrotoluene
p-mononitrotoluene p-methylnitrobenzene | |
| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
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PubChem CID
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| UNII | |
CompTox Dashboard (EPA)
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| Properties | |
| C7H7NO2 | |
| Molar mass | 137.138 g·mol−1 |
| Appearance | crystalline solid[1] |
| Odor | weak, aromatic[1] |
| Density | 1.1038 g·cm−3 (75 °C) [2] |
| Melting point | 51.63 °C (124.93 °F; 324.78 K)[2] |
| Boiling point | 238.3 °C (460.9 °F; 511.4 K)[2] |
| 0.04% (20°C)[1] | |
| Vapor pressure | 0.1 mmHg (20°C)[1] |
| −72.06·10−6 cm3/mol | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
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moderately toxic |
| Flash point | 106 °C; 223 °F; 379 K[1] |
| Explosive limits | 1.6%–?[1] |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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1231 mg/kg (mouse, oral) 1330 mg/kg (rat, oral) 1450 mg/kg (rabbit, oral)[3] |
| NIOSH (US health exposure limits): | |
PEL (Permissible)
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TWA 5 ppm (30 mg/m3) [skin][1] |
REL (Recommended)
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TWA 2 ppm (11 mg/m3) [skin][1] |
IDLH (Immediate danger)
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200 ppm[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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4-Nitrotoluene or para-nitrotoluene is an organic compound with the formula CH3C6H4NO2. It is a pale yellow solid. It is one of three isomers of nitrotoluene.
Synthesis and reactions
[edit | edit source]Together with other isomers, 4-nitrotoluene is prepared by nitration of toluene,[4] commonly using titanium(IV) nitrate.[5] It undergoes the reactions typical for nitrobenzene derivatives, e.g. hydrogenation gives p-toluidine.
Oxidation of the methyl substituent of 4-nitrotoluene has been extensively investigated. Depending on the conditions, oxidation yields 4-nitrobenzaldehyde diacetate,[6] 4-nitrobenzenoic acid,[7] and 4,4'-dinitrobibenzyl.[8] Treatment of 4-nitrotoluene with bromine gives the 4-nitrobenzyl bromide.[9]
Applications
[edit | edit source]The principal application involves its sulfonation to give the 4-nitrotoluene-2-sulfonic acid (with the –SO3H group adjacent to methyl). This species can be oxidatively coupled to produce stilbene derivatives,[10] which are used as dyes.[11] Representative derivatives include the molecular and salt forms of 4,4'-dinitroso- and the 4,4'-dinitro-2,2'-stilbenedisulfonic acids, e.g. disodium 4,4'-dinitrostilbene-2,2'-disulfonate.[12]
Safety
[edit | edit source]Evidence exists for toxicity and carcinogenicity in mice.[13]
References
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