Novel coordinatively unsaturated ruthenium complexes, (eta(5)-C5Me5)Ru(amidinate), were synthesized from [(eta(5)-C5Me5)Ru(OMe)](2) and lithium amidinates, which exist as monomers in both solution and solid states and are highly reactive toward two-electron ligands.
The first organoruthenium(iv) complexes containing nitrogen donor ligands by oxidative addition of allylic substrates to coordinatively unsaturated Ru(ii) complexes
Oxidativeaddition of allylic substrates to coordinativelyunsaturated ruthenium(II), (η5-C5Me5)Ru(amidinate) complexes, afford cationic ruthenium(IV) compounds, [(η5-C5Me5)Ru(amidinate)(η3 -allyl)]+, which have been characterized by spectroscopic analysis and X-ray structure determination.
将烯丙基底物氧化加成到配位不饱和的钌 (II)、(η5-C5Me5)Ru(amidinate) 配合物中,得到阳离子钌 (IV) 化合物 [(η5-C5Me5)Ru(amidinate)(η3 -allyl)]+,通过光谱分析和 X 射线结构测定对其进行了表征。
(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)Ru(μ<sub>2</sub>-<sup>i</sup>PrNC(Me)N<sup>i</sup>Pr)Ru(X)(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>): An Unusual Bonding Mode of μ<sub>2</sub>-Amidinate Ligand Providing the First Unequivocal Evidence for Coordinating Ability of π-Conjugate Electrons of the Amidinate Ligands to Transition Metals
Reactions of Cp*Ru(kappa(2)-N(R)=C(R')NR) (1a; R = Pr-i, R' = Me, 1b; R = Bu-t, R' = Ph) with TCNE initially give dark green colored intermediary species, which are readily converted to brown colored "eta(2)-C" coordination complexes, Cp*Ru(kappa(2)-N(R)=C(R')NR)(eta(2)-TCNE) (3a; R = Pr-i, R' = Me, 3b; R = Bu-t, R' = Ph). These "eta C2-" complexes are characterized by spectroscopy and crystallography. A stable ruthenium amidinate having a kappa(1)-N ''-coordinated TCNE, Cp*Ru(kappa(2)-N(Bu-t)=C(Mes)(NBu)-Bu-t)(kappa(1)(N)-TCNE) (2c), is synthesized by treatment of Cp*Ru(kappa(2)-N(Bu-t)=C(Mes)(NBu)-Bu-t) (1c) with TCNE, the structure of which is unequivocally confirmed by X-ray structure determination and the charge transfer nature is supported by ESR analysis. Close analogy in IR and UV-Vis spectroscopy of 2c with the dark green colored intermediary species formed from 1b suggests that this is "kappa(1)-N" ruthenium amidinate, which is rearranged to the "eta(2)-C" complex 3b. (C) 2008 Elsevier B.V. All rights reserved.