Issue 14, 2008
From the journal:

Dalton Transactions

Activation of two C–H bonds of NHC N-methyl groups on triosmium and triruthenium carbonyl clusters†

Javier A. Cabeza,*a   Ignacio del Río,a   Daniel Miguel,b   Enrique Pérez-Carreñoc  and  M. Gabriela Sánchez-Vegaa  

* Corresponding authors

a Departamento de Química Orgánica e Inorgánica, Instituto de Química Organometálica “Enrique Moles”, Universidad de Oviedo-CSIC, Oviedo, Spain
E-mail: jac@fq.uniovi.es
Fax: 34 985103446

b Área de Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Valladolid, Spain

c Departamento de Química Física y Analítica, Universidad de Oviedo, Oviedo, Spain

Abstract

The thermolysis of the NHC triosmium cluster [Os3(Me2Im)(CO)11] (1a; Me2Im = 1,3-dimethylimidazol-2-ylidene) in toluene at reflux temperature sequentially affords the edge-bridged cluster [Os3(µ-H)(µ-κ2-MeImCH2)(CO)10] (2a) and the face-capped derivative [Os3(µ-H)2(µ3-κ2-MeImCH)(CO)9] (3a). These products result from the sequential oxidative addition of one (2a) and two (3a) N–methyl C–H bonds of the original NHC ligand. The related face-capped triruthenium cluster [Ru3(µ-H)2(µ3-κ2-MeImCH)(CO)9] (3b) has been prepared by heating the NHC triruthenium cluster [Ru3(Me2Im)(CO)11] (1b) in THF at reflux temperature. In this case, the pentanuclear derivatives [Ru5(Me2Im)(µ4-κ2-CO)(CO)14] (4b) and [Ru5(Me2Im)2(µ4-κ2-CO)(CO)13] (5b) are minor reaction products, but a ruthenium cluster analogous to 2a has not been obtained. The face-capped oxazole-derived NHC triruthenium cluster [Ru3(µ-H)2(µ3-κ2-OxCH)(CO)9] (3c; MeOx = N-methyloxazol-2-ylidene) is the only isolated product of the thermolysis of [Ru3(MeOx)(CO)11] (1c) in THF at reflux temperature

Graphical abstract: Activation of two C–H bonds of NHC N-methyl groups on triosmium and triruthenium carbonyl clusters

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Article information

DOI
https://doi.org/10.1039/B718770J
Article type
Paper
Submitted
06 Dec 2007
Accepted
07 Feb 2008
First published
28 Feb 2008

Dalton Trans., 2008, 1937-1942

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Activation of two C–H bonds of NHC N-methyl groups on triosmium and triruthenium carbonyl clusters

J. A. Cabeza, I. del Río, D. Miguel, E. Pérez-Carreño and M. G. Sánchez-Vega, Dalton Trans., 2008, 1937 DOI: 10.1039/B718770J

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