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[TiPHOS(Rh)]+: A Fortuitous Coordination Mode and an Effective Hydrosilylation Bimetallic Catalyst
journal contribution
posted on 2005-03-28, 00:00 authored by Virginie Comte, Pierre Le Gendre, Philippe Richard, Claude MoïseThe reaction of the titanocene diphosphine {(η5-C5H5)[η5-C5Me3-1,2-(PPh2)2]TiCl2} (TiPHOS;
1) with [Rh(COD)2](OTf) led to the new early−late heterobimetallic complex [(TiPHOS)Rh(COD)](OTf) (2), whose structure has been determined by X-ray diffraction analysis and by
dynamic NMR studies. A weak bonding interaction between one of the two chloride atoms
of the TiPHOS ligand and the rhodium center has been observed. The bimetallic complex 2
has been tested in parallel with the monometallic complex [(o-dppbe)Rh(COD)](OTf) (3) and
has proved to be a very effective catalyst for the hydrosilylation of aromatic ketones.