Highly fluorophilic phosphines incorporating at least one aromatic ring containing two directly attached perfluoroalkyl groups have been synthesised, their partition coefficients (organic phase: fluorous phase) measured and their electronic properties probed using 1JPtP data for their trans-[PtCl2L2] complexes. These phosphines have been used as modifying ligands for the rhodium catalysed hydroformylation of 1-octene in ...