1: 2-Methoxy-5-nitro benzyl bromide With hydrogen; triethylamine; palladium hydroxide on carbon in N,N-dimethyl-formamide T=20°C; 2: 5-(Methoxymethylene)-2,2-dimethyl-1,3-dioxane-4,6-dione in isopropyl alcohol T=70°C; 0.5 h; 3: in diphenylether; biphenyl T=220°C; 3 h;