Upon treatment with the superbasic 1:1 mixt. of BuLi and Me3COK, cis- and trans-1,1,1-triphenyl-2-butene as well as 4,4,4-triphenyl-1-butene undergo a hydrogen/metal exchange to afford 1-(triphenylmethyl)allylpotassium [4,4,4-triphenyl-2-butenylpotassium] which exists in two stereoisomeric forms. Torsional equilibration leads to an endo/exo ratio of approx. 50:50. Novel endo-stabilizing interactions are discussed to rationalize this result. At temps. around or above 0 Deg, a Ph 1,2-migration, though no 1,4-migration, takes place. [on SciFinder (R)]