copper(l) iodide; magnesium in tetrahydrofuran 1.) RT, 2 h; 2.) -30 deg C, 20 min;

copper(l) iodide; tert.-butyl lithium in diethyl ether; pentane 1.) -78 deg C, 3 h; 2.) a.) -25 deg C, 2 h; b.) -65 deg C, 4 h; Further byproducts given;