1: 3,6-dithiophen-2-yl-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione With potassium carbonate in N,N-dimethyl-formamide T=120°C; 1 h; 2: 1-bromo-octane in N,N-dimethyl-formamide T=120°C;

1: 3,6-dithiophen-2-yl-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione With potassium carbonate in 1-methyl-pyrrolidin-2-one T=140°C; 0.5 h; Inert atmosphere; 2: 1-iodo-n-octane in 1-methyl-pyrrolidin-2-one T=140°C; 5 h; Inert atmosphere;

1.1: potassium tert-butylate / 1,1-dimethylpropan-1-ol / 2 h / 100 - 110 °C / |Inert atmosphere 2.1: potassium carbonate / N,N-dimethyl-formamide / 1 h / 60 °C / |Inert atmosphere 2.2: 20 h / 80 °C View Scheme

N-bromosuccinmide in chloroform T=20°C; 48 h; DarknessInert atmosphere;