Abstract
In the current study Ru(II) vinylidene complexes of the general type: Cl 2 Ru{=C=C(H)R}(PR' 3 )L (R = Ph, SiMe 3 , R'=Ph, Cyclohexyl (Cy) and L = phosphine or N-heterocyclic carbene) are synthesized and tested for the addition of carboxylic acids to terminal alkynes. A careful choice of the catalytic system, substrate and carboxylic acid gives access to alk-1-en-2-yl esters, alk-1-en-1-yl esters or enyne dimerization products. Furthermore, an extension was made to synthesize an analogous 14-electron species by treating one of the complexes with AgBF 4 and its influence on the catalytic activity and selectivity are investigated.
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