1: thien-2-yl bromide With magnesium in diethyl ether 2 h; Heating; 2: 2-bromo-5-decylthiophene With (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride in diethyl ether T=20°C; Kumada cross-coupling; 1 h;

1: 2-(thien-2-yl)thiophene With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.333333 h; 2: 1-bromo-decane in tetrahydrofuran; hexane T=-78 - 20°C; 2 h;

1: hydrazine hydrate / bis-(2-hydroxy-ethyl) ether / Heating 2: KOH / bis-(2-hydroxy-ethyl) ether / Heating View Scheme