Triketiminate bis(borohydride) complexes of rare-earth metals [(2,6-Me2C6H3N=CMe)2C(2,6-Me2C6H3N=CBut)]Ln(BH4)2(THF)2 (Ln = Y, Nd): synthesis, structure, and catalytic activity in polymerization of rac-lactide, ε-caprolactone, and isoprene
作者:G. G. Skvortsov、A. V. Cherkasov、A. A. Trifonov
DOI:10.1007/s11172-017-1939-9
日期:2017.9
6-Me2C6H3N=CBut)]Ln(BH4)2(THF)2 (Ln = Y (3), Nd (4)). As opposed to the complexes with neutral triketimine, the monoanionic triketiminate ligand is coordinated to Li and Y or Nd cations in a bidentate fashion. Complexes 3 and 4 catalyze the polymerization of rac-lactide and ε-caprolactone; in combination with [Ph3C][B(C6F5)4] and AlBu3i (1 : 1 : 10 molar ratio), these compounds exhibit catalytic activity in the
通过亚胺酰氯2,6-Me2C6H3N=CClBut与二酮亚胺锂(2,6-Me2C6H3N= CMe)2CHLi。在结晶状态下,化合物 1 以二亚胺烯胺形式存在;在溶液中,以三亚胺形式。三酮亚胺 1 与正丁基锂在 0 °C 的 THF 中金属化生成三酮亚胺锂 [(2,6-Me2C6H3N=CMe)2C(2,6-Me2C6H3N=CBut)]Li(THF)2 (2)。Ln(BH4)3(THF)3 (Ln = Y, Nd) 与化合物 2(1:1 摩尔比,THF)的复分解反应得到中性三酮亚胺双(硼氢化物)配合物 [(2,6-Me2C6H3N=CMe )2C(2,6-Me2C6H3N=CBut)]Ln(BH4)2(THF)2 (Ln = Y (3), Nd (4))。与与中性三酮亚胺的配合物相反,单阴离子三酮亚胺配体以双齿方式与 Li 和 Y 或 Nd 阳离子配位。配合物3和4催化外消旋丙交酯和ε-己内酯的聚合;与