in pentane under Ar, pentane condensed onto Sm-compd., addn. of HCCPh, allowed to warm to 0°C over a period of 20 min, stirred for 20 min, stirred at room temp. for 30 min; removal of solvent in vac., dissolved in toluene at 50°C, cooled to -15°C, filtered; elem. anal.;