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Congeneric complexes ( S )-{OˆO}MCH 2 SiMe 3  (M=Al,  3 ; Ga,  5 ; In,  6 ) of the triel metals supported by an enantiomerically pure phenolato-alkoxo {OˆO} 2−  dianionic tridentate ligand derived from prolinol, along with their chloro derivatives, have been prepared and characterised. The aluminium-alkyl species ( S )-{OˆO}AlMe and  3  form four-coordinate complexes with slightly distorted tetrahedral geometries, whereas the geometry in the Lewis acidic five-coordinate ( S )-{OˆO}GaCl·THF is a distorted trigonal bipyramid. These alkyl complexes do not react cleanly, if at all, with protic sources. The indium(III) compound  6 , which is for instance inert towards  i PrOH or BnOH even after hours at 70°C, catalyses at 95°C the controlled, immortal ring-opening polymerisation of racemic lactide (up to 1000 equivalents) in the presence of excess BnOH as a chain transfer agent. It affords atactic, monodisperse polylactides with predictable molecular weights.

Aluminium, gallium and indium complexes supported by a chiral phenolato-prolinolato dianionic ligand