890 Wisconsin Academy of Sciences, Arts, and Letters. 
Trihydroxides of methyl-2-anthraquinone. 
Morindon,—A trihydroxy methyl-2-anthraquinone, isomeric 
with emodin, occurs in the rind of the root of Morinda citri- 
folia, 1 Morinda umhellata, 2 and Morinda tinctoria, 3 along with 
the glucoside morindin and other similar coloring principles. 
It was first isolated by Anderson 1 in 1849. It has sometimes 
been mistaken for alizarin which it resembles in many of its 
properties. 
Morindon crystallizes in reddish brown crystals and sublimes 
in long orange red needles. It melts at 272°. It is easily 
soluble in alcohol ether, ethyl acetate, benzene and similar hy¬ 
drocarbons. Ferric chloride colors a solution of morindon 
dark green, alkalies a violet blue. Morindin is soluble in con¬ 
centrated sulphuric acid with a violet blue color. 
Literature on Morindin and Morindon. 
Anderson, — Ann., 71, p. 216. 
Oesterle and Tisza, — Arch. d. Pharm., 245, p. 534. 
Perkin and Hummel, — Jr. Chem. Soc., 65, p. 851. 
Rochleder, — Ann., 82, p. 205. 
Steenhouse, — Jahresber. d. Chem., 97, p. 234 
Stockes, — Jahresber. d. Chem., 17,p. 543. 
Stockes and Stein, — Jahresber. d. Chem., 19, p. 645. 
Thorpe and Greenall, — Jahresber. d. Chem., 40, p. 2299. 
Thorpe and Smith, — Jahresber. d. Chem., 40, p. 2363. 
Tschirch, — Arch. d. Pharm., 222, p. 129. 
Tunmann, — Chem. Centralbl., 1909.1. p. 199. 
Hexh'ifdroxides of methyl-2-anthraquinone. 
Pseudopurpurin,—Trihydroxy-1, 2, 4-carboxyl-2' -?anthra- 
quinone, or Trihydroxy-1, 2, 4-carboxyl-3' -anthraquinone. 
OH O 
OH O 
Unn., 71, p. 216; 82, p. 205 ; Chem. News.,: 54, p. 293. 
a Jr. Chem. Soc., 63, 1160; 65, 851. 
8 Whemer, Die Pflanzenstoffe, p. 737. 
