ethyl bromide; magnesium in tetrahydrofuran 1 h; reflux, 1 h;

n-butyllithium; magnesium bromide in tetrahydrofuran; hexane

ZnCl2*(1,4-dioxane); 1,1'-bis(diphenylphosphanyl)ferrocenenickel(II) chloride 1.) Et2O, 0 deg C, 15 min then room temp., 45 min, 2.) Et2O, reflux, 36 h; Multistep reaction. Title compound not separated from byproducts;

in tetrahydrofuran