Abstract
Six chromone and chromanone derivatives (I-VI) have been isolated from rhubarb (commercial name : ?? ?? ?? ?? ), together with torachrysone 8-O-β-D-glucopyranoside (VII), kaempferol (VIII) and kaempferol 3-O-α-L-rhamnoside (IX). The structures of I-VI were established on the basis of chemical and spectroscopic data to be 2, 5-dimethyl-7-hydroxychromone (I), 2-methyl-5-acetonyl-7-hydroxychromone (II), 2-methyl-5-carboxymethyl-7-hydroxychromone (III), 2-(2'-hydroxypropyl)-5-methyl-7-hydroxychromone (IV), 2-(2'-hydroxypropyl)-5-methyl-7-hydroxychromone 7-O-β-D-glucopyranoside (V) and 2-methyl-5-carboxymethyl-7-hydroxychromanone (VI).
