1: 1-bromo-3,5-difluoro-benzene With (2,2,6,6-tetramethylpiperidinyl)MgCl*LiCl in tetrahydrofuran T=-20°C; 1 h; Inert atmosphereSchlenk technique; 2: [(Cyanocarbonyl)oxy]ethane in tetrahydrofuran T=25°C; Negishi Coupling; 1 h; Inert atmosphereSchlenk technique;