| http://www.w3.org/ns/prov#value | - Most preferably the organometallic compounds are selected from magnesium and aluminum organometallics and especially from magnesium and aluminum alkyls or mixtures thereof represented by the formulas R1 MgR2 and R1 R2 AlR3 wherein each of R1, R2 and R3 which may be the same or different are alkyl groups, aryl groups, cycloalkyl groups, aralkyl groups, alkoxide groups alkadienyl groups or alkenyl g
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