Patent ID: 7041759

Claim:
An olefin polymerization catalyst comprising a pre-catalyst having the formula: wherein M is Ti, Zr or Hf; each R 1 is independently hydrogen or alkyl or two adjacent R 1 form an aryl group; each R 2 and R 3 is optionally substituted and is independently alkyl, cycloalkyl, SiX 3 , or aryl; or one R 1 and one of R 2 or R 3 are taken together to form an alkyl, aryl, arylalkyl or alkylarylalkyl bridge; R 4 comprises SiX 3 , BR 6 3 or a solid support; each R 5 is halo, optionally substituted alkyl, cycloalkyl, aryl, or arylalkyl; R 6 is optionally substituted phenyl; B is the element boron; and X is independently halo, alkyl, alkoxy or aryl.