Treatment of the ansa-bridged η-cyclopentadienylimide
compound
[Nbη
5
,κN-C
5
H
4
(CH
2
)
3
N}Cl
2
] 1 with MgMeBr gave
the binuclear ansa-bridged η-cyclopentadienylimide
derivative
[MeNbµ-C
5
H
4
(CH
2
)
3
N}µ-NCH(CH
2
)
2
C
5
H
4
}NbMe
2
] 2. The crystal structure of
2 has been determined. Detailed
1
H and
13
C NMR
studies showed that 2 undergoes an interesting fluxional process
involving interchange of two methyl groups under an ansa arch.
Reaction of 1 with Na(C
5
H
5
) gave
[Nbη
5
,κN-C
5
H
4
(CH
2
)
3
N}(η
5
-C
5
H
5
)(η
1
-C
5
H
5
)] 3, which is
also fluxional and undergoes diverse dynamic processes including
exchange between η
1
- and
η
5
-cyclopentadienyl rings. The compounds
[Nbη
5
,κN-C
5
H
4
(CH
2
)
3
N}(CH
2
Ph)
2
] and
[Nbη
5
,κN-C
5
H
4
(CH
2
)
3
N}CH
2
C(Me)CH
2
}
2
] have also been prepared.
用 MgMeBr 处理双氮桥接的 δ-
环戊二烯亚胺化合物 [Nbδ- 5 ,δN-C 5 H 4 (CH 2 ) 3 N}Cl 2 ] 1,得到双核双氮桥接的 δ-
环戊二烯亚胺衍
生物 [MeNbµ-C 5 H 4 (CH 2 ) 3 N}µ-NCH(CH 2 ) 2 C 5 H 4 }NbMe 2 ] 2。2.2 的晶体结构已经确定。1 与 Na(C 5 H 5 ) 反应得到 [Nbδ- 5 ,δN-C 5 H 4 (CH 2 ) 3 N}(δ- 5 -C 5 H 5 )(δ- 1 -C 5 H 5 )] 3,它也是通性的。3,它也具有通性,并经历了多种动态过程,包括δ- 1 -
环戊二烯环和δ- 5 -
环戊二烯环之间的交换。此外,还制备了 [Nbδ- 5 ,δN-C 5 H 4 (CH 2 ) 3 N}(CH 2 Ph) 2 ] 和 [Nbδ- 5 ,δN-C 5 H 4 (CH 2 ) 3 N}CH 2 C(Me)CH 2 } 2 ]。