Patent ID: 6919468

Claim:
An asymmetric Group 8 (VIII) metallocene of the general formula CpMCp′, where M is a metal selected from the group consisting of Ru, and Os; Cp is a first substituted cyelopentadienyl or indenyl moiety that includes at least one substiutuent group D 1 ; Cp′ is a second substituted cyclopentadienyl or indenyl moiety that includes at least one substituent group D 1 ′; wherein D 1 is different from D 1 ′; D 1 is selected from the group consisting of: X; C a1 H b1 X C1 ; C a2 H b2 X c2 (C═O)C a1 H b1 X c1 ; and C a2 H b2 X c2 OC a1 H b1 X c1 , where X is F, Cl, Br, I or NO 2 ; a1 is an integer from 2to 8; b1 is an integer from 0 to 2(a1)+1−c1; c1 is an integer from 0 to 2(a1)+1+ 1 −b1; b1+c1 is at least 1; a2 is an integer from 0 to 8; b2 is an integer from 0 to 2(a2)+1−c2; c2 is an integer from 0 to 2(a2)+1−b2; and D 1 ′ is selected from the group consisting of: X; C a1 H b1 X c1 ; C a2 H b2 X c2 (C═O)C a1 H b1 X c1 ; and C a2 H b2 X c2 OC a1 H b1 X c1 , where, X is Fl, Cl, Br, I or NO 2 ; a1 is an integer from 0 to 8; b1 is an integer from 0 to 2(a1)+1−C1; c1 is an integer from 0 to 2(a1)+1−b1; b1+c1 is equal to or greater than 1; a2 is au integer from 0 to 8; b2 is an integer from 0 to 2(a2)+1−c2; c2 is an integer from 0 to 2(a2)+1−b2; b2+c2 is greater to or equal to 1.