An abnormal Claisen rearrangement of 3,3-dimethylallyl oestrone ether
Abstract
Rearrangement of 3,3-dimethylallyl oestrone ether gives mainly 2-(1,2-dimethylallyl) oestrone. The normal Claisen product, 2-(1,1-dimethylallyl)oestrone was not isolated until it was first trapped as its butyric ester.2-(1,1-Dimethylallyl)oestrone was transformed into the 2-(1,2-dimethylallyl) isomer under the conditions of the Claisen rearrangement.