1: 4,8-dihydrobenzo[1,2-b:4,5-b']dithiophene-4,8-dione With sodium hydroxide; zinc 1 h; Reflux; 2: 2-ethyl-hexyl-1-bromide With tetrabutylammomium bromide 8 h; Reflux;

1: 4,8-dihydrobenzo[1,2-b:4,5-b']dithiophene-4,8-dione With sodium hydroxide; zinc in ethanol; water 1 h; Reflux; 2: 2-ethylhexyl p-toluenesulfonate in ethanol; water

tetrabutylammomium bromide in water Reflux;

1: 4,8-di(2-ethyl)hexyloxybenzo[1,2-b;3,4-b′]dithiophene With n-butyllithium in tetrahydrofuran; hexane T=-78 - 20°C; 2 h; Inert atmosphere; 2: trimethylstannyl chloride in tetrahydrofuran; hexane T=-78°C; Inert atmosphere;

tert.-butyl lithium in tetrahydrofuran; water