Synthesis and catalytic properties of some carbonyltriphenylphosphineruthenium(II) complexes
The preparation of [HRuCl(CO)2(PPh3)2], [RuCl2(CO)2(PPh3)2], [RuCl2(CO)(PPh3)2], and [RuCl2(CO)(PPh3)2L] complexes (L =NN′-dimethylformamide, NN′-dimethylacetamide, or dimethyl sulphoxide) from [RuCl2(PPh3)3] is reported. Analogous bromo-complexes were also synthesised. The solvent molecules (L) are co-ordinated to the metal through oxygen, and are removed by recrystallisation from methylene chloride-methanol. Under mild conditions the carbonyl complexes show low activity for homogeneous olefin hydrogenation and are ineffective for hydroformylation, but the five-co-ordinate complex [RuCl2(CO)(PPh3)2] is efficient as an olefin isomerisation catalyst.