in tetrahydrofuran

tetra-(n-butyl)ammonium iodide in tetrahydrofuran

sodium hydride in tetrahydrofuran 0.5 h;

in tetrahydrofuran 1 h; Inert atmosphereSchlenk technique;

in tetrahydrofuran byproducts: pyrazole; (under Ar, Schlenk); mixt. of Fe-complex and Na-salt in THF stirred for 15 min at 40°C; solvent evapd. in vacuo, residue extd. with THF, Al2O3 column chromy. with hexane, THF, washed with EtOH, H2O, acetone, dried in vacuo; elem. anal.;

in tetrahydrofuran byproducts: pyrazole; (under Ar, Schlenk); mixt. of Fe-complex and Na-salt in THF stirred for 45 min at room temp.; solvent evapd. in vacuo, residue extd. with THF, Al2O3 column chromy. with hexane, THF, washed with EtOH, H2O, acetone, dried in vacuo; elem. anal.;