Styphnic Acid
Title: Styphnic Acid
CAS Registry Number: 82-71-3
CAS Name: 2,4,6-Trinitro-1,3-benzenediol
Additional Names: 2,4,6-trinitroresorcinol; 2,4-dihydroxy-1,3,5-trinitrobenzene
Molecular Formula: C6H3N3O8
Molecular Weight: 245.10
Percent Composition: C 29.40%, H 1.23%, N 17.14%, O 52.22%
Literature References: May be prepd from natural sources, such as Pernambuco wood extract or quebracho extract by the action of nitric acid: Einbeck, Jablonski, Ber. 54, 1086 (1921). Prepd industrially by first sulfonating, then nitrating resorcinol: Merz, Zetter, Ber. 12, 681, 2037 (1879); Datta, Varma, J. Am. Chem. Soc. 41, 2043 (1919). Prepd by nitrating 2,4-dinitroresorcinol: Kametani, Ogasawara, Chem. Pharm. Bull. 15, 893 (1967).
Properties: Hexagonal yellow crystals from dil alc. Astringent, but not bitter taste. Solvated crystals from acetic acid. Sublimes in high vacuum. Becomes almost colorless upon vacuum sublimation, but turns deep yellow on contact with air. When dry, mp 175.5°; also reported as mp 179-180°. One gram dissolves in 156 ml water at 14°, in 88 ml water at 62°. Freely sol in alcohol, ether. Acid to litmus. Dibasic acid. Deflagrates on rapid heating.
Melting point: mp 175.5°; mp 179-180°
Use: Has been used in the manuf of explosives.

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