nickel in water 20 h; Heating;

1: alpha-Terthiophene With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 1 h; Inert atmosphere; 2: carbon dioxide in tetrahydrofuran; hexane T=-78 - 20°C; Inert atmosphere;

lithium diisopropyl amide in tetrahydrofuran var. amounts of LDA; Product distribution;