Abstract
Metal dialkylaluminum hydrides and strong bases (NaH, BuLi) associated with reducing agents [(alkyl) 2 AlH, (alkyl) 2 BH, RMgBr] are shown to form a new class of activating agents for the anionic Polgmerization of lactams. Upon treating e-caprolactam (eCL) with these new activating agents, active species of reduced nucleophilicity, as compared to the mere caprolactamate anions, are obtained. Once deprotonated, the monomer undergoes a reduction by these activating agents at its carbonyl position. These active species behave very similarly to sodium 2-(dialkoxyaluminoxy)-1-azacycloheptane, a salt obtained upon reacting eCL with NaAlH 2 (OR) 2 and whose contribution to the polymerization of lactams has been thoroughly investigated
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