MONOCARBONYL RUTHENIUM AND OSMIUM CATALYSTS
The invention relates to a method for preparation of monocarbonyl complexes of ruthenium and osmium with bi- and tridentate nitrogen and phosphine ligands. The complexes can be used as catalysts for reduction reactions of ketones and aldehydes both via transfer hydrogenation or hydrogenation with hydrogen.
The purpose of the present invention relates to the synthesis of complexes of ruthenium containing a CO ligand in combination with bidentate and tridentate nitrogen ligands and achiral or chiral phosphines which can easily been prepared form carbonyl precursors. These complexes can be used as catalysts in the (asymmetric) reduction of carbonyl compounds (aldehydes and ketones) by transfer hydrogenation or hydrogenation with molecular hydrogen under low pressure. A further object of the present invention is to obtain ruthenium complexes which can be generated in situ during the reduction of carbonyl compounds via hydrogenation with molecular hydrogen or by transfer hydrogenation
- Reduction of carbonyl compounds;
- Selective reduction of aldehydes and ketones;
- Low pressure hydrogenation;
- Hydrogen transfer reduction.
- Stable catalysts;
- Straightforward synthesis of the catalysts;
- High atom economy;
- High speed;
- High selectivity;
- High productivity.