Patent ID: 6894180
Filing Date: 2005-05-17
Classification: B01J,C07F,C08F

Abstract:
1. A catalyst system comprising the formula: wherein M is a 3d, 4d or 5d transition metal; each X is an atom or group bonded to M and are the same or different; R 1 and R 2 are the same or different and are substituted or unsubstituted cyclopentadienyl groups; R B is a structural bridge between R 1 and R 2 comprising three heteroatoms bonded to M, with each of R 1 and R 2 bonded to the same or different heteroatom of R B which heteroatom is also bonded to M; Z is the coordination number of M and is greater than or equal to 4; m is the number of bonds between M and heteroatoms of R B and m≧2; and with R 1 , R 2 and R B selected to provide C 1 , C 2 or C S symmetry.