| http://www.w3.org/ns/prov#value | - atoms and X is a halogen atom, and/or a dialkyl magnesium compound represented by the general formula R7R8Mg wherein R7 and R8 are each a hydrocarbon group having 1 to 20 carbon atoms and a polymeric support consisting of polyvinylchloride, polyvinylalcohol, polyketone, hydrolyzed polyketone, ethylene-vinylalcohol copolymer or polycarbonate; and
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