Novel polymerization and copolymerization of ethylene, styrene,
and/or butadiene by new organolanthanide-based catalysts*
Zhaomin Hou**, Shojiro Kaita, and Yasuo Wakatsuki
Organometallic Chemistry Laboratory, RIKEN (The Institute
of Physical and Chemical Research) , Hirosawa 2-1, Wako, Saitama 351-0198,
Japan
Abstract: Replacement of one of the two C5Me5
ligands in the samarocene (II) complex (C5Me5) 2Sm (THF)
2 with a monodentate anionic ligand (e. g. , OAr, SAr, or NR1R2)
gives a unique catalytic system, which can not only polymerize styrene
and ethylene, but also copolymerize them into block styrene-ethylene
copolymers under the presence of both monomers. On the other hand, addition
of an appropriate cocatalyst such as MMAO or AlR3/[Ph3C][B (C6F
5) 4] to the samarocene complex (C5Me5) 2Sm (THF)
2 or (C5Me5) 2Sm (m-Me) 2AlMe2
affords a novel catalytic system for stereospecific 1,4-cis living polymerization
of butadiene and copolymerization of butadiene with styrene.
* Lecture presented at the XIXth International Conference
on Organometallic Chemistry (XIX ICOMC) , Shanghai, China, 23-28 July
2000. Other presentations are published in this issue, pp. 205-376.
** Corresponding author
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