Facial Access To Chiral β-Diketiminato Ligands And Their Zinc Aluminum Complexes

The synthesis of six sterically demandingβ-diketiminato ligands (L-H) {[(2,6-¹Pr₂C₆H₃) N=C(CH₃) CH=C(R¹) NR²] H (R¹= Me, R²= (R)-1-Phenylethyl, (R)-(L-1) H; R¹= Phenyl, R²= (R)-1-Phenylethyl, (R)-(L-2) H; R¹= Me, R²= 1-Phenylethyl, (L-l)H; R¹= Phenyl, R²= 1-Phenylethyl, (L-2) H; R¹= Me, R² = 1-(1-Naphthyl)ethyl, (L-3) H; R¹= Phenyl, R²= 1-(1-Naphthyl)ethyl, (L-4) H)} are described. These ligands were converted to L-ZnN(SiMe) and L-AlMe complexes by reaction with Zn[N(SiMe)] and AlMe in toluene, repeatively. Element analysis, ¹H NMR and EI-MS were employed to characterize these complexes.Complex (R)-(L-2) ZnN(SiMe₃) ₂ has been employed for catalysis performance study of ring-open polymerization of lactide.