Four amidate-functionalized N-heterocyclic carbene (NHC) rare-earth metal amido complexes [(κ 2 -N,O-κ 1 -L) 2 REN(SiMe 3 ) 2 ] (L = 1-(C 6 H 5 CONCH 2 CH 2 )-3-(CH 3 ) 3 C 6 H 2 (N(CH) 2 NC)) [RE = Er (1), Y (2), Dy (3), Gd (4)] were synthesized by one-pot reactions of 2 equiv of (1-(C 6 H 5 CONHCH 2 CH 2 )-3-(CH 3 ) 3 C 6 H 2 -(N(CH) 2 NCH))Br (H 2 LBr) with 5 equiv of KN(SiMe 3 ) 3 followed by treatment with 1 equiv of RECl 3 in tetrahydrofuran at −40 °C. These complexes were fully characterized, and their catalytic activities toward hydroboration of unactivated imines and nitriles were investigated, and it was found that these complexes displayed excellent activities as well as remarkable functional group compatibility for imine and nitrile substrates such as halo-, alkyl-, hydroxyl-, N,N-dimethylamino-, and nitro-substituents. Among those, the chemoselectivity for this reaction among the common unsaturated functional groups was achieved in the order CO ≫ CN > CN > CO 2 Et > CC in the current catalytic system, which may facilitate their further application in synthetic chemistry.

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A series of aluminum complexes with Schiff base bridged indolyl ligands were synthesized as rac-lactide polymerization catalysts.