in benzene according to R. Bender, P. Braunstein, A. Tiripicchio and C. M. Tiripicchio, J. Chem. Soc., Chem. Commun., 42 (1984); CO atm.; mixture stirred (4 h); homogenization step; after 15 min yellow ppt.;; washing (benzene/hexane); dried in vac.;;

in benzene according to R. Bender, P. Braunstein, A. Tiripicchio and C. M. Tiripicchio, J. Chem. Soc., Chem. Commun., 42 (1984); CO atm.; mixture stirred (4 h); homogenization step; after 15 min yellow ppt.;; washing (benzene/hexane); dried in vac.;;

in chloroform N-chloroamine in CHCl3 is added to a CHCl3 soln. of the palladiumcarbonyl and the mixt. is stirred at room temp. for 24 h.; filtration, partial evapn. of the solvent and addn. of hexane leads to a solid; elem. anal. of the mixt. of geometric isomers;

in benzene according to R. Bender, P. Braunstein, A. Tiripicchio and C. M. Tiripicchio, J. Chem. Soc., Chem. Commun., 42 (1984); CO atm.; mixture stirred (4 h); homogenization step; after 15 min yellow ppt.;; washing (benzene/hexane); dried in vac.;;