Polysubstituted cyclopentadiene compound, in which at least one substituent is of the form -RDR'.sub.n, in which R is a bonding group, D is a hetero atom selected from group 15 or 16 of the Periodic System of the Elements, R' is a substituent and n is the number of R' groups bonded to D, and in that at least one further substituent is a branched alkyl group.
多取代
环戊二烯化合物,其中至少一个取代基的形式为-RDR'.sub.n,其中R是键合基团,D是从元素周期表15或16族中选择的杂原子,R'是取代基,n是与D键合的R'基团数,且至少还有一个取代基是支链烷基。