Beschreibung:
<jats:p><jats:bold>Homoisoflavanones. IV. New constituents of the Eucomin Series of <jats:italic>Eucomis bicolor</jats:italic>.</jats:bold></jats:p><jats:p>Four new homoisoflavanones, (<jats:italic>E</jats:italic>)‐7‐O‐methyl‐eucomin (<jats:bold>2a</jats:bold>), (—)‐7‐O‐methyleucomol (<jats:bold>5</jats:bold>), (+)‐3,9‐dihydro‐eucomin (<jats:bold>7a</jats:bold>) and 7‐O‐methyl‐3,9‐dihydro‐eucomin (<jats:bold>8</jats:bold>), were isolated from the bulbs of <jats:italic>Eucomis bicolor</jats:italic> Bak. (<jats:italic>Liliaceae</jats:italic>). Their structures were determined by spectral data and synthesis. These compounds occur exclusively in the waxy material between the bulb leaves. Furthermore it was shown that only (<jats:italic>Z</jats:italic>)‐eucomin (<jats:bold>1b</jats:bold>) is genuine, (<jats:italic>E</jats:italic>)‐eucomin (<jats:bold>1a</jats:bold>) being an artefact. It is likely that <jats:bold>2a</jats:bold> is also not genuine. A new method for a selective 7‐O‐methylation is described.</jats:p>