1: 1-(2-methylcyclohex-1-en-1-yl)ethanone With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-25°C; Metallation; 0.333333 h; 2: chloro-trimethyl-silane in tetrahydrofuran; hexane T=-25 - 20°C; silylation; 2 h;

1.1: ZnI2; ZnCl2 / 4.25 h / 0 °C 2.1: diisopropylamine; n-BuLi / tetrahydrofuran; hexane / 0.33 h / -25 °C 2.2: 93 percent / tetrahydrofuran; hexane / 2 h / -25 - 20 °C View Scheme