Organoamido zirconium( iv ) and titanium( iv ) complexes and their catalysis towards ethylene polymerization
The reaction of PhN(Li)SiMe 3 with 2 equiv. of dimethylcyanamide with further addition of 2 equiv. of CpTiCl 3 led via Me 3 SiCl elimination to dinuclear titanium( iv ) compound 1 . The reaction of DippN(Li)SiMe 3 with 1 equiv. of dimethylcyanamide with further addition of 1 equiv. of CpTiCl 3 affor...
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Veröffentlicht in: | RSC advances 2015-01, Vol.5 (127), p.105292-105298 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The reaction of PhN(Li)SiMe
3
with 2 equiv. of dimethylcyanamide with further addition of 2 equiv. of CpTiCl
3
led
via
Me
3
SiCl elimination to dinuclear titanium(
iv
) compound
1
. The reaction of DippN(Li)SiMe
3
with 1 equiv. of dimethylcyanamide with further addition of 1 equiv. of CpTiCl
3
afforded centrosymmetric dimeric titanium(
iv
) compound
2
and mononuclear
3
with the elimination of Me
3
SiCl. The zirconium(
iv
) compound
4
was obtained by the addition reaction of PhN(Li)SiMe
3
with 2 equiv. of dimethylcyanamide and metathesis reaction with ZrCl
4
. X-ray diffraction studies of
1–4
establish the dinuclear titanium(
iv
) structure in
1
, half-titanocene of
2
and
3
, and a propeller-like complex fragment of
4
. Complexes
2
and
4
show moderate or high activities in the polymerization of ethylene upon activation with methylaluminoxane (MAO). |
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ISSN: | 2046-2069 2046-2069 |
DOI: | 10.1039/C5RA20868H |