Process for preparation of monocyclopentadienyl metal complex compounds and method of use

An addition polymerization process wherein one or more addition polymerizable monomers are polymerized in the presence of a catalyst prepared by a process comprising contacting

• a) a derivative of a Group 4 or Lanthanide metal corresponding to the formula:
• ##STR4## wherein:
• M is zirconium or titanium;
• Cp* is a cyclopentadienyl group;
• or a group selected from indenyl, fluorenyl and hydrogenated derivatives thereof;
• or one of the foregoing groups substituted with one or more alkyl, aryl or cycloalkyl moleties of up to 20 carbons, said Cp* further being bound in an .eta..sup.5 bonding mode to M;
• Z is SIR*.sub.2, CR*.sub.2, SiR*.sub.2 SiR*.sub.2, CR*.sub.2 CR*.sub.2, CR*=CR*, CR*.sub.2 SiR*.sub.2, or GeR*.sub.2.
• Y is a nitrogen or phosphorus containing group corresponding to the formula --N(R"")-- or --P(R"")--;
• wherein:
• R* each occurrence is hydrogen or a moiety selected from alkyl, aryl, silyl, halogenated alkyl, halogenated aryl groups and combinations thereof having up to 20 non-hydrogen atoms, and
• R"" is C.sub.1-10 alkyl or C.sub.6-10 aryl;
• X" each occurrence is halo, alkyl, aryl, alkoxy, or aryloxy of up to 20 carbons;
• and
• p is 2, with
• b) a salt corresponding to the formula .COPYRGT.+A-, wherein .COPYRGT.+ is a stable carbonium ion containing up to 30 nonhydrogen atoms and A- is a noncoordinating compatible anion;
• under conditions to cause abstraction of one X" and formation of the neutral species, .COPYRGT.X".