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Synthesis of (a) 1,2-dihydroxy-9H-xanthen-9-one (1); (b) 3,4-dihydroxy-1-methyl-9H-xanthen-9-one (2) and 3,4,6-trihydroxy-1-methyl-9H-xanthen-9-one (3); (c) 1,4-dihydroxy-3-methoxy-9H-xanthen-9-one (4); and (d) 1,8-dihydroxy-3,6-dimethyl-9H-xanthen-9-one (5).
