1,2-Dihydroxybenzene, 2,3-dihydroxytoluene, 2,3-dihydroxybenzoic acid, 2,3-hydroxyacetophenone, 3,8-dihydroxy-2-methylchromone (I), and its precursor 6,7,8,8a-tetrahydro-3,8a-dihydroxy-2-methyl-8-oxobenzopyrone (II) were obtained by reaction of D-glucuronic acid in slightly acidic aqueous solution (the last three products also from D-xylose).