作者:Alexander Friedrich、Jonathan Eyselein、Holger Elsen、Jens Langer、Jürgen Pahl、Michael Wiesinger、Sjoerd Harder
DOI:10.1002/chem.202100641
日期:2021.5.17
Lewis acidic cationic aluminium complexes, stabilized by β–diketiminate (BDI) ligands and free of Lewis bases, have been prepared as their B(C6F5)4− salts and were investigated for catalytic activity in imine hydrogenation. The backbone (R1) and N (R2) substituents on the R1,R2BDI ligand (R1,R2BDI=HC[C(R1)N(R2)]2) influence sterics and Lewis acidity. Ligand bulk increases along the row Me,DIPPBDI
强路易斯酸性阳离子铝络合物,通过β-二亚胺基(BDI)的配体和游离的路易斯碱稳定的,已被制备成其B(C 6 ˚F 5)4 -的盐和被研究用于亚胺氢化的催化活性。R1,R2 BDI配体(R1,R2 BDI = HC [C(R1)N(R2)] 2)上的主链(R1)和N(R2)取代基会影响空间和路易斯酸度。配体沿着行体积增大Me中,DIPP BDI <我,DIPeP BDI≈吨卜,DIPP BDI <吨卜,DIPeP BDI; DIPP = 2,6‐C(H)Me 2‐苯基,DIPeP = 2,6‐C(H)Et 2-苯基。Gutmann-Beckett检验显示的受主数为:(t Bu,DIPP BDI)AlMe + 85.6,(t Bu,DIPeP BDI)AlMe + 85.9,(Me,DIPP BDI)AlMe + 89.7,(Me,DIPeP BDI)AlMe + 90.8,(Me,DIPP BDI)AlH