Abstract
AbstractTetranuclear Schiff‐base complexes L1–32Ga4(t‐Bu)8 1–3 are highly active and selective (>99 %) catalyst in the alternating ring‐opening copolymerization (ROCOP) of epoxides and anhydrides, yielding polyesters with high molecular weights (Mn) and narrow dispersity (Đ). The thermal properties (Tg) of the resulting polyester range from 18 °C to 124 °C and increase with increasing steric bulk or rigidity along the polymer backbone. Comparative studies using structurally related complexes L4Ga(t‐Bu)2 4, [L5GaR2]2 (R=t‐Bu 5, R=Me 6) and L6Ga(t‐Bu)2 7 proved that the Ga2O2 core of catalyst 1 is the catalytically active species.
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