Aryneânickel complexes
[Ni(η
2
-C
6
H
4
)L
2
]
[L
2
= 2PEt
3
or dcpe;
dcpe = (C
6
H
11
)
2
PCH
2
CH
2
P(C
6
H
11
)
2
] and
[Ni(η
2
-C
10
H
6
)(PEt
3
)
2
] reacted readily with C
2
F
4
to form
the corresponding five-membered tetrafluoro-substituted nickelacycles
[Ni(C
6
H
4
CF
2
CF
2
-2)L
2
] (L
2
= dcpe or
2PEt
3
) and
[Ni(2-C
10
H
6
CF
2
CF
2
-3)(PEt
3
)
2
], respectively. The complex
[Ni(C
6
H
4
CF
2
CF
2
-2)(dcpe)] is very stable towards air, whereas the PEt
3
analogues react readily to give µ-aryloxo dimers. The
naphthalene-based dimer
[Ni(µ-2-OC
10
H
6
CF
2
CF
2
-3)(PEt
3
)}
2
] has
been structurally characterized. The complexes
[Ni(C
6
H
4
CF
2
CF
2
-2)L
2
] insert CO into their arylânickel bonds to
form six-membered acyl complexes
[NiC(O)C
6
H
4
CF
2
C
F
2
-2}L
2
] (L
2
= dcpe
or 2PEt
3
) and, after CO-induced reductive elimination,
2,2,3,3-tetrafluoroindanone. The dcpe acyl complex has also been shown
to undergo reaction with air to form the carboxylato complex
[NiOC(O)C
6
H
4
CF
2
C
F
2
-2}(dcpe)], whose structure has been confirmed by
X-ray crystallography. Some insertions of acetylenes into the
arylânickel bonds of
[Ni(C
6
H
4
CF
2
CF
2
-2)L
2
] are also reported.
Aryne–
镍配合物
[Ni(η²-
C6H4)
L2]
[
L2 = 2PEt3或dcpe;dcpe = (
C6H11)2PCH2CH2P( )2] 和 [Ni(η²-
C10H6)(PEt3)2] 很容易与
C2F4反应,形成相应的五元四
氟取代
镍环 [Ni(
CF2CF2-2)
L2] (
L2 = dcpe或2PEt3) 和 [Ni(2-
CF2CF2-3)(PEt3)2]。配合物 [Ni(
CF2CF2-2)(dcpe)] 对空气非常稳定,而PEt3 的类似物则容易反应生成μ-芳氧二聚体。基于
萘的二聚体 [Ni(μ-2-O
CF2CF2-3)(PEt3)}2] 已被结构表征。配合物 [Ni(
CF2CF2-2)
L2] 将CO插入其芳基–
镍键,形成六元酰基配合物 [NiC(O)
CF2CF2-2}
L2] (
L2 = dcpe或2PEt3),并在CO诱导下进行还原消除,生成2,2,3,3-四
氟印酮。dcpe 酰基配合物也已被证明可以与空气反应形成
羧酸盐配合物 [NiOC(O)
CF2CF2-2}(dcpe)],其结构已通过X射线晶体学确认。也有一些关于碳
乙炔插入 [Ni(
CF2CF2-2)
L2] 中芳基–
镍键的报道。