Abstract
:(Z)-Narceine enol lactone ( 10 ) is thennodynamically less stable than its geometric isomer 11 , and solvolyses faster in methanol to provide keto ester 9 . In the less hindered hydrastine series, however, the order is reversed, and it is the E isoner 4 which is less stable than the Z analog 3 and which solvolyses faster to keto ester 6 .
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