1: 1,4-dimethoxy-2-fluorobenzene With n-butyllithium in tetrahydrofuran T=-78°C; 1.66 h; Inert atmosphereReflux; 2: 2,4,6-tri(tert-butyl)phenylmagnesium bromide in tetrahydrofuran T=-78 - 20°C; 13.5 h; Inert atmosphere; Further stages;