1: 1,4-dibromo-2,5-bis(hexyloxy)-benzene With n-butyllithium in diethyl ether; hexane 1 h; Heating; 2: N,N-dimethyl-formamide T=0 - 20°C;

1: 1,4-dibromo-2,5-bis(hexyloxy)-benzene With n-butyllithium in diethyl ether; n-heptane T=-20 - 20°C; 2: N,N-dimethyl-formamide in diethyl ether T=20°C; Bouveault reaction; 1 h; Further stages.;

n-butyllithium in diethyl ether; hexane 1.) 0 deg C, 2.) room temperature, 2 h;