1: 2,7-diiodofluorene With potassium tert-butylate in tetrahydrofuran; tert-butyl alcohol T=0°C; Inert atmosphere; 2: methyl iodide in tetrahydrofuran; tert-butyl alcohol T=25°C; 1 h; Inert atmosphere; 3: methyl iodide With potassium tert-butylate in tetrahydrofuran; tert-butyl alcohol T=0 - 25°C; Inert atmosphere;