Pamoic Acid
Title: Pamoic Acid
CAS Registry Number: 130-85-8
CAS Name: 4,4¢-Methylenebis[3-hydroxy-2-naphthalenecarboxylic acid]
Additional Names: 4,4¢-methylenebis(3-hydroxy-2-naphthoic acid); 4,4¢-methylenedi(3-hydroxy-2-naphthoic acid); 2,2¢-dihydroxy-1,1¢-dinaphthylmethane-3,3¢-dicarboxylic acid; embonic acid
Molecular Formula: C23H16O6
Molecular Weight: 388.37
Percent Composition: C 71.13%, H 4.15%, O 24.72%
Literature References: Prepn from 2-hydroxy-3-naphthoic acid + formaldehyde: Strohback, Ber. 34, 4162 (1901); Brass, Sommer, ibid. 61, 993 (1928); Barber, Gaimster, J. Appl. Chem. 2, 565 (1952). Prepn of salts: Puetzer, US 2397903 (1946 to Vick Chem.); Barber, US 2641610 (1953 to May & Baker).
Properties: Crystals from dil pyridine, dec above 280° without melting. Practically insoluble in water, alcohol, ether, benzene, acetic acid. Sparingly sol in chloroform; sol in nitrobenzene, pyridine.
 
Derivative Type: Methyl ether
Molecular Formula: C24H18O6
Molecular Weight: 402.40
Percent Composition: C 71.63%, H 4.51%, O 23.86%
Properties: Yellow crystals from dil methanol, dec 277-282°.

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