 A model of the most likely reactive conformation of the allylsilane (see below) suggests that the new double bond that forms will predominantly possess the ("E") configuration.However, addition of a nucleophile (such as the counterion of the electrophile) to the intermediate silyl-stabilized carbocation complicates this picture.Because the elimination to generate the double bond is stereospecifically "anti", nucleophilic addition to either face of the silyl-stabilized carbanion leads to the formation of mixtures of double bond isomers.