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Two new C-nor/D-homo corticosteroids were isolated from the filtrate of the triene carbonate intermediate during the production of betamethasone. Their structures were elucidated based on NMR spectroscopic studies and mass spectral analyses. The mechanism of formation of each of these two steroids was postulated as a Wagner-Meerwein rearrangement of the corresponding 12β-hydroxy steroid. The new 12β-hydroxy...
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