in n-heptane; toluene (strict exclusion of air and moisture), Fe complex in toluene cooled to -15°C, treated dropwise wit 2 equiv. of Me2AlCl in heptane, stirred at -15°C for 1 h, treated with pyridine at 0°C, warmed at room temp. for 20 h (stirring); centrifuged, evapd., washed (pentane), dissolved (toluene), treated withpuridine, stirred for 2 h, centrifuged, evapd.(vac.), washed (pentane), elem. anal.;

in hexane (strict exclusion of air and moisture), Fe complex in hexane cooled to -10°C, treated dropwise wit 2 equiv. of Et2AlCl in hexane, stirredat 20°C for 3 h, cooled to -20°C, treated with pyridine, stirred at room temp. for 20 h; centrifuged, evapd., dissolved (toluene), centrifuged, evapd., elem. anal.;

in tetrahydrofuran; hexane; toluene (strict exclusion of air and moisture), Fe complex in THF cooled to -20°C, treated dropwise wit 2 equiv. of Et2AlCl in hexane, stirred atroom temp. for 20 h, evapd.(vac.), dissolved (toluene), treated with py ridine, stirred for 20 h; centrifuged, evapd.(vac.), washed (hexane), dried (vac.), dissolved (Et2O), filtered, evapd.(vac.), elem. anal.;