in benzene-d6 dissolved in benzene under inert atm.; free phosphine is present in 12percent to total phosphorus content at 21°C, shift of the equil. upon addn. of 1 equiv of phosphine ligand or (RhCl(COD))2 confirmes the reversibility of the reaction; (31)P and (1)H NMR spectral data;

triphenylphosphine in benzene 2 equiv of PPh3 were added to a stirred benzene soln. of Rh-complex under inert atmosphere, the soln. was left to stand for 1 week at 35°C; crystals were isolated from the soln. on cooling;

in benzene-d6 dissolved in benzene under inert atm.; free phosphine is present in 12percent to total phosphorus content at 21°C, shift of the equil. upon addn. of 1 equiv of phosphine ligand or (RhCl(COD))2 confirmes the reversibility of the reaction; (31)P and (1)H NMR spectral data;