Abstract
The nucleophiles MeLi and PhLi add cleanly to both rings in [(η
6
-C
6
H
6
)(η
6
-arene)Ru]
2+
(arene = C
6
H
6
, C
6
H
3
Me
3
, C
6
H
3
Pr
i
3
, C
6
Me
6
) to yield bis(η
5
-cyclohexadienyl) complexes; [(η
4
-cyclohexadiene)(arene)Ru] complexes are not formed.