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; Inert atmosphere; 2: 2-ethyl-hexyl-1-bromide With 18-crown-6 ether in N,N-dimethyl-formamide T=150°C; Inert atmosphere;

1.1: potassium tert-butylate / 1,1-dimethylpropan-1-ol / 4 h / 110 °C 2.1: potassium carbonate / N,N-dimethyl-formamide / 1 h / 120 °C / Inert atmosphere 2.2: 150 °C / Inert atmosphere View Scheme

1: C14H8N2O2S2 With potassium carbonate in N,N-dimethyl-formamide T=120°C; 1 h; Inert atmosphere; 2: 2-ethyl-hexyl-1-bromide in N,N-dimethyl-formamide T=130°C; 5 h; Inert atmosphere;

N-bromosuccinmide in chloroform T=0 - 20°C;

N-bromosuccinmide in chloroform T=5 - 20°C;