Acetylido methyl ruthenium(II) complexes, trans-Ru(CtCR)(CH 3 )(dmpe) 2 , were synthesized in a single metathesis reaction from trans-Ru(CH 3 ) 2 (dmpe) 2 at ambient temperature; at elevated temperatures the reaction yields trans-Ru(CtCR) 2 (dmpe) 2 . Addition of a second terminal acetylene to a methanol solution of trans-Ru(CtCR)(CH 3 )(dmpe) 2 results in the formation of trans-Ru(CtCR)(CtCR′)(dmpe) 2 .
A series of dinuclear and trinuclear, acetylide-bridged ruthenium(II) complexes was synthesized by the condensation of terminal acetylenes with methyl ruthenium complexes. Dinuclear ruthenium(II) complexes trans,trans-(RCtC)Ru(dmpe) 2 (μ-CtCC 6 H 4 CtC)Ru(CtCR 0 )(dmpe)
Symmetrical, mononuclear bis(acetylido)ruthenium(II) complexes were prepared by the reaction of [trans-RuMe 2 -(dmpe) 2 ] [dmpe = 1,2-bis(dimethylphosphanyl)ethane] with terminal alkynes. The complexes were characterised by multinuclear NMR spectroscopy and X-ray crystallography. In
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