Abstract
It has been shown that replacement of Cl atoms by I and Br atoms leads to decrease in the activity of the catalytis systems TiCl 3-AlEt 3 owing to decrease in the number of active centres. This decrease is probably due to the fact that a group of titanium atoms bound by halogen bridges, and not a single atom, is involved in the catalytis act. The most effective way of enhancing the isospecificity of the active centre is to induce the iodine-containing compound to act upon the TiCl 3 crystal surface. However, no simple correlation between the stereospecificity of the catalytis systems, ion radii of the anions and distances M-M and M-X was found.
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