| http://www.w3.org/ns/prov#value | - In the first step, a slurry of a solid, porous carrier in a non-polar solvent is contacted with at least one organomagnesium compound of the formula Rm MgR'n where R and R' are the same or different alkyl groups, preferably C4 -C10 alkyl groups, more preferably C4 -C8 alkyl groups, and most preferably both R and R' are butyl groups, and m and n are each 0, 1 or 2, providing that m+n is equal to th
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