DIFUNCTIONAL INITIATORS BASED ON 1,3-DIISOPROPENYLBENZENE .3. SYNTHESIS OF A PURE DILITHIUM ADDUCT AND ITS USE AS DIFUNCTIONAL ANIONIC POLYMERIZATION INITIATOR

摘要

The addition reaction of tert-butyllithium (t-BuLi) to 1,3-diisopropenylbenzene (1,3-DIB) has been studied. Under optimized conditions, i.e., reaction in cyclohexane at -20 degrees C and dropwise addition of 1,3-DIB to a 1:1 t-BuLi-triethylamine (Et(3)N) complex followed by a 1 h postreaction period, a pure diadduct is formed without concomitant oligomerization of 1,3-DIB. The behavior of this diadduct has been investigated, in apolar and polar solvents; triblock copolymers have been prepared and found to have interesting mechanical properties. [References: 22]