in hexane phosphine (2 equiv.) added dropwise at -78°C to Fe complex suspn., stirred for 30 min, warmed slowly to 20°C; hydrolyzed (H2O), org. layer sepd., dried (Na2SO4), solvent removed (vac.), crystd. at 5°C for hours; elem. anal.;

HCl in diethyl ether; ethanol PdCl2 suspn. in EtOH treated with conc. HCl, stirred at 50°C for30 min, filtered, Fe complex (1 equiv.) soln. in Et2O added at 20°C, stirred for 10 min; crystd. at -35°C, filtered, washed (H2O), dried (vac.); elem. anal.;