Ring-opening polymerization aluminium catalysts

Ring-opening polymerization of norbornene with metathesis catalysts and with ethyl aluminium dichloride, in the absence of transition metals, has been reported by Ivin et The formation of ring-opened syndiotactic and... 

Catalytic systems for ring-opening of lactones have also been studied with mechanistic interpretation of the reaction in the case of soluble aluminium-zinc and cobalt-aluminium-oxoalkoxides. Insertion into the aluminium alkoxide bonds by monomer is su ested. These systems have been employed to synthesize lactone block copolymersvia living ring-opening polymerization in homogeneous oi anic phase. c-Caprolactone/)S-propiolactone block copolymers were obtained in a quantitative manner only in the presence of dissociated catalyst. 

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