Disclosed is an anionic diinitiator prepared using a diisopropenyl benzene
compound and an organo lithium compound having primary polymerization
sites. The anionic diinitiators are prepared by admixing a diisopropenyl
benzene compound with diethyl ether, ethylene, an organo lithium
compound, and a solvent under reaction conditions sufficient to prepare a
diinitiator having primary lithium alkyl reactive sites. The diinitiators
are particularly useful in preparing block copolymers.