71. The colouring matters of Drosera Whittakeri. Part II

Pigments of Gnomonia erythrostoma. Part I. The structures of erythrostominone, deoxyerythrostominone, and deoxyerythrostominol

“…Reductive acetylation of erythrostominone gave a leuco-tetra-acetate, in which the benzylic hydroxygroup was shown to have been lost: the same leucocompound was obtained by reductive acetylation of the mixture of deoxyerythrostominone diacetates ( 6) and (9). Structure (10) for the leuco-derivative was confirmed by spectroscopic evidence. Thus its i.r.…”

“…196-197", identical (i.r. spectrum) with deoxyerythrostominone leucotetra-acetate (10) (see later). The third band (53 mg) was shown (n.m.r.…”

“…equiv.). Recovery as in (a) gave a gum which was chromatographed on Kieselgel G (10 x 4 cm). The column was eluted with chloroform-formic acid (49 : 1) and 10 ml fractions were collected.…”