Patent ID: 6124488
Filing Date: 2000-09-26
Classification: B01J,C07C,C07F,C08F,Y10S

Abstract:
A metal complex comprising a metal of group 4 of the Periodic System of Elements with a valency state that is below the metal's highest valency state and comprising as a ligand of the metal at least one cyclopentadiene compound comprising a polysubstituted cyclopentadiene ring compound, wherein at least one substituent on the cyclopentadiene ring is represented by the formula -RDR'.sub.n,wherein R is a linking group between the cyclopentadiene ring and the DR'.sub.n group,D is a hetero atom selected from group 15 or 16 of the Periodic System of the Elements,R' is a substituent on the hetero atom,n is the number of R' groups bonded to D wherein if D originates from group 15 then n=2, and if D originates from group 16 then n=1, andwherein each R' comprises at least one member independently selected from the group consisting of hydrocarbon radicals of 1 to 20 carbon atoms which may comprise one or more hetero atoms selected from groups 14, 15, or 16 of the Periodic System,wherein at least one further substituent present on the cyclopentadiene ring is a branched alkyl group,said compound excluding geminally substituted cyclopentadiene compounds.