Acerginnala Max.에서 분리한 신 Tannin Polygagallin의 화학구조

Structural Study on New Tannin, Polygagallin, from Acerginnala Max.

A new tannin, polygagallin, related to acertannin, is isolated from air-dried leaves of Acerginnala Max. as prismatic crystals with 1/2 H2O per mole, m.p. 154-155o and [alpha] D29+43.79oC, Polygagallin gives hexaacetate, m.p. 164.5oC, [alpha]D28+42o, on treating with anhydroacetic acid and on treating with diazomethane, gives trimethyl ether, m.p. 176oC, [alpha]D22+53.43, which yields triacetate, m.p. 160.5oC, [alpha]D22+132.5o, on acetylation and is not attacked by periodate. On hydrolysis, trimethoxypolygagallin yields one mole of polygalitol and that of trimethoxygallic acid. By the above results polygalallin has been established as 3-galloylpolygalitol.