| http://www.w3.org/ns/prov#value | - The reaction between the tetravalent titanium compound and the organomagnesium compound is performed in the presence of a halogenating agent of the formula R5 X, in which X is a chlorine or bromine atom and R5 is a hydrogen atom or alkyl group comprising from 2 to 12 carbon atoms, and optionally in the presence of an electron donor compound D, these various compounds being employed in molar ratios
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