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

1: 4,8-dihydrobenzo[1,2-b:4,5-b']dithiophene-4,8-dione With sodium hydroxide; zinc in water 1 h; Reflux; 2: 1-bromo-octane With tetrabutylammomium bromide in water 12 h; Reflux;

n-butyllithium in tetrahydrofuran