1: 1,4-dibromo-2-(3,7-dimethyloctyloxy)-5-methoxybenzene With n-butyllithium in diethyl ether; hexane T=-10°C; 0.0833333 h; 2: N,N-dimethyl-formamide in diethyl ether; hexane T=20°C; 1 h; Further stages.;