Dsm N.v.

Edwin G IJpeij

Richard Green

Gerardus J Gruter

Johannes A Van Beek

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.

Cyclopentadiene compound substituted with branched alkyl groups

Polysubstituted cyclopentadiene compound, wherein at least one substituent is of the form --RDR'.sub.n, where R is a bonding group between the cyclopentadiene and the DR'.sub.n group, D is a hetero atom chosen from group 15 or 16 of the Periodic Table of the Elements, R' is a substituent and n is the number of R' groups bonded to D, and in which at least one further substituent is a linear alkyl group comprising at least 2 carbon atoms.

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Sittard, Netherlands

Edwin G IJpeij