Ion-pair structure in anionic polymerization. Effect of temperature and association on an allylic lithium compound in two polar solvents

¹³C NMR studies are reported on enriched samples of a one-unit model of the active centres present in butadiene polymerization. Concentrations between 2 × 10³ M and 1M, and temperatures between −120° and 50° were investigated. The effect of ion-pair association on charge distributions in diethyl ether solutions is described. The effect of temperature on the overall structure in tetrahydrofuran solutions is discussed.