1: 2,4-dimethyl-5-phenyl-3-bromothiophene With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.666667 h; Inert atmosphere; 2: 1-(2,4-dimethyl-5-phenyl-3-thienyl)heptafluorocyclopentene in tetrahydrofuran; hexane T=-78°C; 3 h; Inert atmosphere;