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<http://webisa.webdatacommons.org/134816794>	<http://www.w3.org/ns/prov#value>	"A highly active and stereoselective olefin polymerization catalyst component is obtained by halogenating a magnesium compound of the formula MgR'R wherein R' is an alkoxide or aryloxide group and R is an alkoxide or aryloxide group or halogen, with a halide of tetravalent titanium in Recently Added Patents" .