n-butyl lithium; N,N,N',N'-tetramethylethylenediamine in tetrahydrofuran; hexane under N2 or Ar; hexane soln. of n-BuLi added to stirred soln. of ferrocene in hexane; stirred (20 min); TMEDA added; refluxed (2 h); THF added at ambient temp.; cooled (-40°C); THF soln. of ligand added; warmed to ambient temp.; refluxed (6 h); cooled to ambient temp.; filtered; volatiles removed in vac.; residue triturated with hexane; solid recrystd. from MeCN-THF; elem. anal.;