Catalyst system comprising a first catalyst system tethered to a supported catalyst

A process for the formation of a catalyst comprising the steps of:

• a) providing a first catalyst on a catalyst carrier;
• b) providing a reactive compound comprising a catalyst moiety secured to a tethering linkage, said tethering linkage having an end group which is reactive with said first catalyst on a catalyst carrier either through the first catalyst or through the carrier;
• c) reacting said end group with the first catalyst on a catalyst carrier to tether the catalyst moiety to the first catalyst on said catalyst carrier, wherein said reacting is performed under conditions in which the end group is not as reactive with the catalyst moiety as the end group is reactive with said first catalyst on a catalyst carrier, said first catalyst on a catalyst carrier comprises a supported heterogeneous catalyst, and said catalyst moiety comprises a homogeneous catalyst,
• wherein said supported heterogeneous catalyst comprises metals selected from the group consisting of Pd, Pt, Ni, Co, Fe, Sn, Cd, Sr, Mg, Mn, Zn, Cr, Al, Ag, Au, Ir, Os, Ru, Ti, Zr, and Rh and said homogeneous catalyst comprises metals selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Mo, Re, Ru, Rh, Pd, Pt, Ta, Os, Ir, Zn, Cd, Sn, Sr, Mg, Sb, Se, Al and Bi.