Chinese Journal of Organic Chemistry >
Rare-Earth Metal Complexes-Catalyzed Dehydropolymerization of Methylamine-Boranes
Received date: 2023-01-30
Revised date: 2023-03-10
Online published: 2023-03-31
Supported by
National Natural Science Foundation of China(21871204)
Rare-earth metal complexes-catalyzed dehydropolymerization of amine-borane was achieved. Rare-earth metallo- cene alkyl complexes [(C5Me4R)2LnR', R=Me, H; Ln=Sc, Y; R'=CH2SiMe3, CH(SiMe3)2] were found to be active catalysts for the dehydropolymerization of methylamine-borane (MAB), generating corresponding boron-nitrogen polymer [(MeNHBH2)n, PMAB]. The results showed that the polymerization activity would decrease with the increase of ion radius of the metal center or the decrease of the steric hindrance of the supporting ligands. In the mechanistic study, a β-B-agostic-type scandium amidoborane complex was successfully isolated through the stoichiometric reaction of Sc complex with MAB. Moreover, the control experiment confirmed the existence of scandium hydride species, which may be the catalytic active intermediate.
Key words: rare-earth; amine-borane; dehydrogenation; polymerization; β-hydride elimination
Shengjie Jiang , Yang Wang , Xin Xu . Rare-Earth Metal Complexes-Catalyzed Dehydropolymerization of Methylamine-Boranes[J]. Chinese Journal of Organic Chemistry, 2023 , 43(5) : 1786 -1791 . DOI: 10.6023/cjoc202301026
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