Reactivity of the N-heterocyclic carbene complexes [Ru(IMes)2(CO)HX] (X = OH, Cl) with alkynes |
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| Authors: | Sarah L Chatwin Timothy J Prior |
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| Institution: | a Department of Chemistry, University of Bath, Building 1 South, Claverton Down, Bath BA2 7AY, UK
b SRS Station 16.2 SMX, CCLRC Daresbury Laboratory, Warrington WA4 4AD, UK |
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| Abstract: | Treatment of the 16-electron hydroxy hydride complex Ru(IMes)2(CO)H(OH)] (1, IMes = 1,3-bis-(2,4,6-trimethylphenyl)imidazol-2-ylidene) with HC CR affords the alkynyl species Ru(IMes)2(CO)H(CCR)] (R = Ph 3, SiMe3, 4) and Ru(IMes)2(CO)(CCR)2] (R = Ph, 5). Deuterium labelling studies show that the mono-alkynyl complexes are formed via hydrogen transfer from a coordinated alkyne ligand to Ru-OH, while bis-alkynyl formation is proposed to take place through hydrogen transfer to Ru-H. Both 3 and 5 readily coordinate CO to give the corresponding dicarbonyl species 6 and 7. Addition of HCCPh to the hydride chloride precursor Ru(IMes)2(CO)HCl] (2) results in a different reaction pathway involving alkyne insertion into the Ru-H bond to yield the alkenyl chloride complex Ru(IMes)2(CO)(CH CHPh)Cl] 8. Complexes 3-8 have been structurally characterised by X-ray crystallography. |
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| Keywords: | N-Heterocyclic carbenes Alkynyl ligands Ruthenium complexes |
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