| http://www.w3.org/ns/prov#value | - A process for producing a magnesium containing support for titanium comprising contacting magnesium metal, a halogenated hydrocarbon and a compound represented by the formula X'm C(OR')4-m wherein X' is a hydrogen atom, a halogen atom or a C1 -C10 alkyl, aryl, cycloalkyl or halogenated alkyl, aryl, cycloalkyl group, R' is a C1 -C20 alkyl, aryl or cycloalkyl group and m is 0, 1 or 2 to form a magne
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