SCHEDULED MAINTENANCE
Pentamethylcyclopentadienyl tungsten complexes containing imido,
hydrazido and amino acid derived N–O chelate
ligands
Abstract
Reactions of [W(η-C
5
Me
5
)Cl
4
]
with a number of functionalised amines have been studied. With 2
equivalents of the dianiline
2,2′-(H
2
NC
6
H
4
)
2
C
2
H
4
the ansa-bis(imido)tungsten complex
[W(η-C
5
Me
5
)Cl{2,2′-(NC
6
H
4
)
2
CH
2
CH
2
}] 1 was
obtained. Analogous treatment with 2-diphenylphosphinoaniline gave the
2-diphenylphosphine-substituted imidometal species
[W(η-C
5
Me
5
)Cl(NC
6
H
4
PPh
2
-2)
2
] 2. The pendant tertiary phosphine groups do
not interact with the metal centre. 1,1-Diphenylhydrazine hydrochloride
reacted with [W(η-C
5
Me
5
)Cl
4
] to
give
[W(η-C
5
Me
5
)Cl
3
(NNPh
2
)]
3. Reactions of [W(η-C
5
Me
5
)Cl
4
]
with the amino acid 2,2-diphenylglycine or tyrosine afforded the
tungsten(V) complexes
[W(η-C
5
Me
5
)Cl
3
(NH
2
CPh
2
CO
2
)] 4 and
[W(η-C
5
Me
5
)Cl
3
{NH
2
CH(CH
2
C
6
H
4
OH-p)CO
2
}] 5 respectively. Complexes 1 to 5 have been structurally
characterised.
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