Arylcycloalkanes have been prepared from acetophenone by a three-step sequence involving the synthesis of α-pheny (ω-alkenyl) methylselenides and their reaction with butyl- lithium reagents to give an intermediate which adds across the CC double bond to give 2- methyl-2-phenylcycloalkylmethyl-lithiums with stereocontrol; other syntheses of these compounds are also described.