The present invention is directed to a functionalized elastomer comprising the reaction product of a living anionic elastomeric polymer and a polymerization terminator of formula I wherein R1 is C1 to C4 linear alkyl, or C1 to C4 branched alkanediyl; X1, X2, X3 are independently O, S, or a group of formula (II) or (III) where R2 is C1 to C18 linear or branched alkyl; and Z is —R3—CH═CH—R4, where R3 is a covalent bond or C1 to C18 linear or branched alkanediyl, and R4 is a hydrogen or C1 to C18 linear or branched alkyl.