STRUCTURAL STUDY OF THE QUINONE PIGMENTS FROM THE ROOTS OF CASSIA ALATA

Abstract

Two new anthraquinone pigments (A) m. p. 232° and (B) m. p. 180° and β–sitosterol have been isolated from the roots of Cassia alata. The structures of these pigments have been established as 1,3,8–trihydroxy–2–methyl anthraquinone (A) and 1,5–dihydroxy–8–methoxy–2–methyl–anthraquinone–3–o–β–D–(+)–glucopyranoside (B).

Zusammenfassung

Aus den Wurzeln von Cassia alata wurden neben β–Sitosterol 2 neue Anthrachinonpigmente mit den Strukturen 1,3,8–Trihydroxy–2–methyl–anthrachinon und 1,5–Dihydroxy–8–methoxy–2–methyl–anthrachinon–3–o–β–D–(+)–glucopyranosid isoliert.