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Alternatively, the anhydrous magnesium halide is preactivated using known methods and then treated with an excess of TiCl4 containing an electron donor compound in solution at a temperature between 80??? and 135??? C. The treatment with TiCl4 is then repeated, and the solid is then washed with hexane or other suitable hydrocarbon solvent to eliminate all traces of unreacted TiCl4.
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