Novel Dinuclear (μ-Hydrido)(μ-alkylideneamido)ruthenium Complexes, [(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)Ru]<sub>2</sub>(μ-L)(μ-H)(μ-NCHR) (R = Me, Et; L = MeCN, Arene), as Precursors of Active Species for Bimetallic Activation. Dehydrogenative Coupling of Ethylene in a Dinuclear Ruthenium Complex
journal contribution
posted on 1996-05-14, 00:00 authored by Ken-ichi Tada, Masaki Oishi, Hiroharu Suzuki, Masako TanakaThe dinuclear ruthenium tetrahydride
[(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)Ru(μ-H)<sub>2</sub>]<sub>2</sub>
reacts with acetonitrile or propionitrile
in the presence of an arene such as toluene or naphthalene to generate the
(μ-hydrido)(μ-alkylideneamido)ruthenium complex
(Cp‘Ru)<sub>2</sub>(μ-L)(μ-H)(μ-NCHR) (L
=
(arene); Cp‘ = η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>).
The reaction of the (μ-alkylideneamido)ruthenium complex with ethylene gives the
bis(ethylene)ruthenium complex
[Cp‘Ru(η<sup>2</sup>-CH<sub>2</sub>CH<sub>2</sub>)]<sub>2</sub>(μ-H)(μ-NCHCH<sub>3</sub>), which undergoes
dehydrogenative
coupling of the ethylene ligand to yield the
μ-η<sup>2</sup>:η<sup>2</sup>-s-<i>cis</i>-butadiene complex
(Cp‘Ru)<sub>2</sub>(μ-η<sup>2</sup>:η<sup>2</sup>-CH<sub>2</sub>CHCHCH<sub>2</sub>)(μ-H)(μ-NCHCH<sub>3</sub>).
