titanium tetrachloride; zinc; 1,1-dibromomethane in tetrahydrofuran T=-60 - 20°C;

1: C8H10O2 With tetra(n-butyl)ammonium hydroxide in tetrahydrofuran; water T=0°C; 1 h; 2: methyl iodide in tetrahydrofuran; water T=20°C;