Uncatalyzed Formation of Polyaminoboranes from Diisopropylaminoborane and Primary Amines: a Kinetically Controlled Polymerization Reaction

Recently, we disclosed the uncatalyzed formation of polyaminoboranes (PABs) from monomeric diisopropylaminoborane (iPr2N−BH2) and primary amines (RNH2). Their structure is studied through a detailed multinuclear NMR study their full spectroscopic characterization presented revealing that N-alkyl substituted PABs exhibit magnetically non-equivalent methylenic protons in close vicinity BN-backbone. We also performed an in-depth theoretical this global chemical process. The mechanism fully apprehended strong influence temperature on outcome reaction unveiled. DFT-calculations clearly show (RNH−BH2)n results kinetically controlled step-growth polymerization can be globally viewed as head-to-tail association process situ generated transient monoalkylamino-borane [RNH−BH2].