New cyclopenta [B] a transition metal fluorenyl compound, comprising a catalyst composition and methods of use thereof for preparing an ethylene homopolymer or an ethylene-olefin copolymer and α-

The present invention is directed to cyclopentyl based upon and [b] a transition metal compound new fluorenyl groups, and which comprises for preparing ethylene homopolymers or copolymers of ethylene and α- olefin having a transition metal catalyst composition with high catalytic activity, a copolymer thereof the method of preparing ethylene homopolymers or ethylene and α- olefin copolymers and ethylene prepared homopolymer or an ethylene and α- olefin.