Abstract
The phoszone ligand [(Ph2P)(bis-3,5-CF3-Ph)]NN=CH(penta-fluoro-Ph) transformed in liquid CO2 at room temperature in presence of [Rh(cod)2]OTf into [Rh(cod)(η2-P,P′-Ph2POPPh2)]OTf. Replacing the O-atom in Ph2POPPh2 by a PrN-group leads to the ligand PrN(PPh2)2 acting similarly as a bidentate ligand in [Rh(cod)(η2-P,P′-PrN(PPh2)2)]OTf. Hydroformylation of 1-octene with in situ catalysts formed by the ligands with [Rh(cod)2]OTf showed hydroformylation activities at 50 % conversion of 16,000 h−1 (PrN(PPh2)2/[Rh(cod)2]OTf) and 24,000 h−1 (phoszone/[Rh(cod)2]OTf), respectively.
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