Nitrophenol

Mono-nitrophenols
	; 2-Nitrophenol (o-)
	; 3-Nitrophenol (m-)
	; 4-Nitrophenol (p-)
Identifiers
	Compounds; o: o-nitrophenol (2-); m: m-nitrophenol (3-); p: p-nitrophenol (4-); p: p tautomer;
CAS Number	o: 88-75-5; m: 554-84-7; p: 100-02-7;
3D model (JSmol)	o: Interactive image; m: Interactive image; p: Interactive image; p: Interactive image;
ChEBI	o: CHEBI:16260; m: CHEBI:34346; p: CHEBI:16836;
ChEMBL	m: ChEMBL13888; p: ChEMBL14130;
ChemSpider	p: 955;
DrugBank	p: DB04417;
KEGG	p: C00870;
PubChem CID	o: 6947; m: 11137; p: 980;
UNII	p: Y92ZL45L4R;
	InChI o: InChI=1S/C6H5NO3/c8-6-4-2-1-3-5(6)7(9)10/h1-4,8H Key: IQUPABOKLQSFBK-UHFFFAOYSA-N; m: InChI=1S/C6H5NO3/c8-6-3-1-2-5(4-6)7(9)10/h1-4,8H Key: RTZZCYNQPHTPPL-UHFFFAOYSA-N; p: InChI=1S/C6H5NO3/c8-6-3-1-5(2-4-6)7(9)10/h1-4,8H Key: BTJIUGUIPKRLHP-UHFFFAOYSA-N;
	SMILES o: Oc1ccccc1[N+]([O-])=O; m: Oc1cccc(c1)[N+]([O-])=O; p: c1cc(ccc1[N+](=O)[O-])O; p: O=[N+]([O-])c1ccc(O)cc1;
Properties
Chemical formula	C6H5NO3
Molar mass	139.110 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Nitrophenols are compounds of the formula HOC₆H_5−x(NO₂)_x. The conjugate bases are called nitrophenolates. Nitrophenols are more acidic than phenol itself.[1]

Mono-nitrophenols

with the formula HOC₆H₄NO₂. Three isomeric nitrophenols exist:

o-Nitrophenol (2-nitrophenol; OH and NO₂ groups are neighboring; CAS number: 88-75-5), a yellow crystalline solid (m.p. 46 °C).
m-Nitrophenol (3-nitrophenol, CAS number: 554-84-7), a yellow solid (m.p. 97 °C) and precursor to the drug mesalazine (5-aminosalicylic acid).
p-Nitrophenol (4-nitrophenol, CAS number: 100-02-7), yellow crystals (m.p. 114 °C). It is a precursor to the rice herbicide fluorodifen, the pesticide parathion, and the human analgesic paracetamol (also known as acetaminophen).

The mononitrated phenols are often hydrogenated to the corresponding aminophenols that are also useful industrially.[1]

Di- and trinitrophenols

2,4-dinitrophenol

picric acid

2,4-Dinitrophenol (m.p. 83 °C) is a moderately strong acid (pK_a = 4.89).

2,4,6-Trinitrophenol is better known as picric acid, which has a well-developed chemistry.

Safety

Nitrophenols are poisonous. Occasionally, nitrophenols contaminate the soil near former explosives or fabric factories and military plants, and current research is aimed at remediation.[2]

References

Gerald Booth (2007). "Nitro Compounds, Aromatic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a17_411. ISBN 978-3527306732.
Fact sheet at atsdr.cdc.gov

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[Booth-1] Gerald Booth (2007). "Nitro Compounds, Aromatic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a17_411. ISBN 978-3527306732.

[2] Fact sheet at atsdr.cdc.gov