12, 20-Diacetoxy-11, 16-dioxo-1, 2-secopicrasa-3, 12-diene-1, 2-dioic acid and 12α-acetoxy-11β, 20-epoxy-11α-methoxy-16-oxo-1, 2-secopicrasa-3, 13 (21) -diene-1, 2-dioic acid were prepared from ailanthone and their oxidation reactions with lead tetraacetate were investigated.
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Ishibashi et al. (1987) studied this question.
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