Synthesis and imido-group exchange reactions of tert-butylimidotitanium complexes
Abstract
Treatment of TiCl
4
with Bu
t
NH
2
(6
equivalents) followed by addition of bpy (2 equivalents,
4-tert-butylpyridine) or pyridine (py) (2 or 4 equivalents)
afforded the five- or six-co-ordinate tert-butylimido
complexes
[Ti(NBu
t
)Cl
2
(bpy)
2
] or
[Ti(NBu
t
)Cl
2
(py)
n
]
(n = 2 or 3*) respectively in good yields.
Reaction of [Ti(NBu
t
)Cl
2
(py)
3
] with
RNH
2
gave the corresponding arylimido derivatives
[Ti(NR)Cl
2
(py)
3
] (R = Ph,*
C
6
H
4
Me-4,*
C
6
H
4
NO
2
-4,*
C
6
H
3
Me
2
-2,6 or
C
6
H
3
Pr
i
2
-2,6). Addition
of
tmen or pmdien to
[Ti(NBu
t
)Cl
2
(py)
n
]
(n = 2 or 3 respectively) gave the
corresponding
bi- or tri-dentate amine complexes,
[Ti(NBu
t
)Cl
2
(tmen)] or
[Ti(NBu
t
)Cl
2
(pmdien)]*
(tmen = Me
2
NCH
2
CH
2
NMe
2
,
pmdien = N,N,N′,N
″,N
″
-pentamethyldiethylenetriamine). Complexes labelled * have been
crystallographically characterised.
″
-pentamethyldiethylenetriamine). Complexes labelled * have been
crystallographically characterised.
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