1000.
Dehydropolymerisation of methylamine borane (H
3B⋅NMeH
2) using the well-known iron amido complex [(PNP)Fe(H)(CO)] (PNP=N(CH
2CH
2P
iPr
2)
2) ( 1 ) gives poly(aminoborane)s by a chain-growth mechanism. In toluene, rapid dehydrogenation of H
3B⋅NMeH
2 following first-order behaviour as a limiting case of a more general underlying Michaelis–Menten kinetics is observed, forming aminoborane H
2B=NMeH, which selectively couples to give high-molecular-weight poly(aminoborane)s (H
2BNMeH)
n and only traces of borazine (HBNMe)
3 by depolymerisation after full conversion. Based on a series of comparative experiments using structurally related Fe catalysts and dimethylamine borane (H
3B⋅NMe
2H) polymer formation is proposed to occur by nucleophilic chain growth as reported earlier computationally and experimentally. A silyl functionalised primary borane H
3B⋅N(CH
2SiMe
3)H
2 was studied in homo- and co-dehydropolymerisation reactions to give the first examples for Si containing poly(aminoborane)s.
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