1: 3-chloro-2-methyl-propene With magnesium in tetrahydrofuran T=0 - 20°C; Inert atmosphere; 2: p-bromomethylchlorobenzene in tetrahydrofuran T=0 - 20°C; Inert atmosphere;

ethyl bromide; iodine; magnesium; copper(I) bromide 1.) diethyl ether, 25-30 deg C, 5 h; 2.) THF, reflux, 3 h; Yield given. Multistep reaction;