Mg in tetrahydrofuran (Ar) mixt. FeCl2 and Mg was stirred for 1 h being heated with heat gun, cooled to room temp., soln. PMe3 in THF was added, stirred for 1 h at room temp.; volatiles were removed in vacuo, residue was treated with pentane, soln.was filtered and evapd. in vacuo;

Na/Hg in tetrahydrofuran Ar-atmosphere; stirring (-20°C, 8 h), filtering, PMe3 addn., stirring (-20°C, 3 h); pptn. on concg. and toluene addn., chromy. (alumina, MeCN), recrystn. (MeCN / EtOH); elem. anal.;