1: 2-(4'-bromophenyl)-1,3-dioxolane With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.416667 h; Inert atmosphere; 2: N-Methoxy-N-methyl-benzamide in tetrahydrofuran; hexane T=-78 - 20°C; 20 h; Inert atmosphere;

aluminum oxide in tetrachloromethane 24 h; Heating;

toluene-4-sulfonic acid in tetrahydrofuran; water T=20°C; 4 h; Inert atmosphere;