1: thiophene With n-butyllithium in diethyl ether T=20°C; 2 h; 2: chloro-diphenylphosphine in diethyl ether T=20°C; Further stages.;

1: bis-diphenylphosphine With n-butyllithium in tetrahydrofuran 0.333333 h; Stirring1.6 M n-BuLiUnder Ar or N2; 2: 2,5-dibromothiophene T=20°C; 2 h;