| http://www.w3.org/ns/prov#value | - In synthesizing the nonbridged metallocene catalysts of the present invention, any suitable technique can be used to produce substituted cyclopentadienyl groups which may be lithiated, for example, following a protocol such as disclosed in parent now U.S. Pat. No. 4,892,851 for reaction with a transition metal chloride to form the neutral metallocene ligands of the present invention.
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