- Styphnic acid
Chembox new
Name = Styphnic acid
ImageFile = Styphnic acid.png
IUPACName = 2,4,6-trinitrobenzene-1,3-diol
Section1 = Chembox Identifiers
CASNo = 82-71-3
UNNumber = 0219 – "Dry or wetted with < 20% water/alcohol" 0394 – "Wetted with >= 20% water/alcohol"
SMILES = OC1=C( [N+] ( [O-] )=O)C(O)=C
( [N+] ( [O-] )=O)C=C1 [N+] ( [O-] )=O
Section2 = Chembox Properties
Formula = C6H3N3O8
MolarMass = 245.11 g/mol
Density = 1.829 g/cm3
MeltingPt = 180 °C
BoilingPt = dec.Styphnic acid, or 2,4,6-trinitro-1,3-benzenediol, is a yellow
astringent acid that forms hexagonalcrystal s. It is used in the manufacture ofdye s,pigment s,ink s,medicine s, andexplosive s such aslead styphnate . It is itself a sensitive explosive, similar topicric acid .Preparation and chemistry
It may be prepared by the nitration of
resorcinol with a mixture of nitric andsulfuric acid [ [http://www.roguesci.org/chemlab/energetics/styphnic_acid.html Synthesis of styphnic acid ] ] .This compound is an example of a trinitro phenol.
Like
picric acid , it is a moderately strong acid, displacing carbon dioxide from solutions ofsodium carbonate for example.It may be reacted with weakly basic oxides such as those of lead and silver to form the corresponding salts.
The solubility of
picric acid and styphnic acid in water is far less than the non nitrated phenol and less than the corresponding mono and di nitro compounds so they may be purified by fractional crystallisation.References
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