Summary
A series of cyclic dimethoxysilanes has been prepared using a one-step strategy which consists in reacting magnesium dibromoalkanes with tetramethoxysilane. The dimethoxysilacycloalkanes obtained were evaluated as the external electron donor in Ziegler–Natta catalysts for propylene polymerisation. Comparison of the experimental results with theoretical predictions using a molecular model confirmed the essential structural characteristics that are required to achieve stereospecific polymerisation of propylene. Very good activity and stereospecificity were obtained with 2,6-diethyl-1,1-dimethoxysilacyclohexane which led to results close to that of actual industrial external electron donors, cyclohexylmethyldimethoxysilane and dicyclopentyl dimethoxysilane.
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Batt-Coutrot, D., Wolf, V., Malinge, J. et al. Study of Dimethoxysilacycloalkanes as External Donors in Ziegler-Natta Stereospecific Propylene Polymerisation. Polym. Bull. 54, 377–385 (2005). https://doi.org/10.1007/s00289-005-0399-9
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DOI: https://doi.org/10.1007/s00289-005-0399-9