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Abstract
To confirm the location of the lactone ring at ring A of gihberellin A3, selenium de-hydrogenation experiments were conducted in various ways. The results thus obtained and NMR spectrum studies rather support structure (III).
Abstract
On the catalytic hydrogenation of gibberellin A3, the lactone ring was hydrogenized accompanying the double bond migration to C-10~C-11. The structures of two hydrogenolysis products thus obtained are discussed along with their acid-catalyzed relactonization. Subsequent dehydration of secondary hydroxyl groups at C-2 of these products gave unexpected aromatized compounds, the structures of which are also discussed.