Rubiadin
Title: Rubiadin
CAS Registry Number: 117-02-2
CAS Name: 1,3-Dihydroxy-2-methyl-9,10-anthracenedione
Additional Names: 1,3-dihydroxy-2-methylanthraquinone
Molecular Formula: C15H10O4
Molecular Weight: 254.24
Percent Composition: C 70.86%, H 3.96%, O 25.17%
Literature References: From Rubia tinctorum L., Coprosma var., Morinda citrifolia Linn, Rubiaceae: Schunck, Ann. 87, 344 (1853); Briggs, Nicholls, J. Chem. Soc. 1949, 1241; Briggs et al., ibid. 1952, 1718; Borvie, Cooke, Aust. J. Chem. 15, 332 (1962). Structure: Marchlewski, J. Chem. Soc. 63, 1137 (1893); Schunck, Marchlewski, ibid. 65, 182 (1894); Jones, Robertson, ibid. 1930, 1699. Synthesis: Joshi et al., J. Sci. Ind. Res. 14B, 87 (1955); Hirase, Chem. Pharm. Bull. 8, 417 (1960).
Properties: Yellow plates from glacial acetic acid, mp 302°; yellow slender plates from alc, mp 290°. Absorption max (ethanol): 246, 280, 415 nm (log e 4.39, 4.52, 3.87). Sol in alc, ether. Practically insol in water, alkalies.
Melting point: mp 302°; mp 290°
Absorption maximum: Absorption max (ethanol): 246, 280, 415 nm (log e 4.39, 4.52, 3.87)
 
Derivative Type: Diacetate
Properties: Yellow rods from acetic anhydride, mp 228°.
Melting point: mp 228°
 
Derivative Type: Dimethyl ether
Properties: Yellow needles from alc, mp 160.5°.
Melting point: mp 160.5°

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