The diadduct made from a 2:1 ratio of n-butyllithium to m-diisopropenylbenzene has been evaluated as a diinitiator for synthesizing alpha,omega-hydroxyl terminated polybutadiene in cyclohexane solution. While the g.c./m.s, analysis results showed the predominant formation of the diadduct at 20 degrees C, an incomplete reaction at 0 degrees C led to a mixture containing a variety of initiating species of varying number of carbon-lithium ends. The observed narrow monomodal molecular weight distribution resulting from the use of this mixture indicated that this diadduct did not react as a diinitiator but rather as a monoinitiator. Although one of the two carbon-lithium ends of the diadduct was inactive during the polymerization, both ends were able to react with oxetane, thus forming the alpha,omega-hydroxyl terminated polybutadiene. This monofunctionality during polymerization and difunctionality towards the capping reaction has been corroborated by H-1 n.m.r., C-13 n.m.r. and hydroxyl titration. The capping reaction of the carbon-lithium end was as efficient for poly(butadienyl)dilithium, synthesized using the diadduct as the initiator, as for poly(butadienyl)lithium, synthesized using n-BuLi as the initiator. The inactivity of one of the two carbon-lithium ends during the polymerization did not prevent the diadduct from being an effective initiator for making telechelic HTPB.