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(C CR)] (R = Ph 3, SiMe 3, 4) and [Ru(IMes) 2(CO)(C CR) 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 HC CPh 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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