Pyromellitic Acid

Title: Pyromellitic Acid
CAS Registry Number: 89-05-4
CAS Name: 1,2,4,5-Benzenetetracarboxylic acid
Molecular Formula: C10H6O8
Molecular Weight: 254.15
Percent Composition: C 47.26%, H 2.38%, O 50.36%
Literature References: Prepd by heating mellitic (benzenehexacarboxylic) acid with KHSO4 and H2SO4: Silberrad, J. Chem. Soc. 89, 1795 (1906) (actually the dianhydride, mp 286°, is obtained by this method). Laboratory prepn from pine or spruce charcoal: Philippi, Thelen, Org. Synth. coll. vol. II, 551 (1943); by oxidation of benzene derivatives contg substituents in the 1,2,4,5 positions: Jacobsen, Ber. 17, 2516 (1884).
Derivative Type: Dihydrate
Properties: Triclinic plates from water. When anhydr, mp 276°. Distills with anhydride formation. 1.5 g (anhydr) dissolves in 100 ml water. Freely sol in alc.
Melting point: mp 276°
Derivative Type: Tetramethyl ester
Molecular Formula: C14H14O8
Molecular Weight: 310.26
Percent Composition: C 54.20%, H 4.55%, O 41.25%
Properties: Leaflets from alc, mp 141.5°.
Melting point: mp 141.5°
Pyronaridine Pyronine B Pyronine Y Pyrophosphoric Acid Pyrosulfuric Acid