Solution structures and exchange phenomena of the new alkene polymerization initiators (η-C5Me5)TiMe(E)(µ-Me)B(C6F5 )3 (E = C6F5, OC6F5) and [(η-C5Me5)Ti(OC6F5)2 ][BMe(C6F5)3]
Abstract
The solution structures and dynamics of the new alkene polymerization
initiators
(η-C
5
Me
5
)TiMe(C
6
F
5
)(µ-
Me)B(C
5
F
5
)
3
2,
(η-C
5
Me
5
)TiMe(OC
6
F
5
)(µ
-Me)B(C
6
F
5
)
3
3 and
[(η-C
5
Me
5
)Ti(OC
6
F
5
)
2
][BMe(C
5
F
5
)
3
] 4 are compared and
contrasted with those of the known initiator
(η-C
5
Me
5
)TiMe
2
(µ-Me)B(C
6
F
5
)
3
1; compound 2 undergoes neither
spontaneous ion-pair dissociation to the solvent separated
[(η-C
5
Me
5
)TiMe(C
6
F
5
)]
+
and
[BMe(C
6
F
5
)
3
]
-
nor borane
dissociation to its precursors
(η-C
5
Me
5
)TiMe
2
(C
6
F
5
) and B(C
6
F
5
)
3
; in contrast, 3 is
more labile and does undergo ion-pair dissociation, while 4 exists in
solution as the separated ion species in equilibrium with its precursors,
(η-C
5
Me
5
)TiMe(OC
6
F
5
)
2
and B(C
6
F
5
)
3
.
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