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Properties of substance:

(+)-usnic acid

Group of substances:

organic

Physical appearance:

yellow prismatic crystals

Empirical formula (Hill's system for organic substances):

C18H16O7

Molar/atomic mass: 344.33

Melting point (°C):

196

Solubility (g/100 g of solvent):

chloroform: very soluble [Ref.]
diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
water: insoluble [Ref.]

Dissociation:

pKa (1) = 4.4 (25°C, water)
pKa (2) = 8.8 (25°C, water)
pKa (3) = 10.7 (25°C, water)

LD50 (mg/kg):

25 (mice, intravenous)

References:

  1. Armarego W. L. F. Purification of Laboratory Chemicals. - 5ed. - 2003. - pp. 573
  2. Dictionary of organic compounds. - Vol. 3, naphthacarbazole - zygadenine. - М.: ИИЛ, 1949. - pp. 908
  3. The Merck Index 11th ed., Merck & Company, 1989. - pp. 1557
  4. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 1034-1035 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru