1: tert-Butyldimethyl[(1-methyl-2,2-diphenylethenyl)oxy]silane With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=20°C; 6 h; 2: chloro-trimethyl-silane in tetrahydrofuran; hexane T=0°C; Further stages.;

in chloroform-d1 T=60°C; 12 h;

1.1: KH / tetrahydrofuran / 2 h / 20 °C 1.2: 78 percent / tetrahydrofuran / 48 h / 20 °C 2.1: LDA / tetrahydrofuran / 6 h / 20 °C 2.2: 82 percent / tetrahydrofuran / 12 h / 20 °C View Scheme

1: 58 percent / CHCl3 2: 33 percent / 1,2-dichloro-benzene / 137.9 °C / first order rate constant 62.5E-5 s-1; activation parameters Ea=19.16 +/- 0.15 kcal/mol, ΔH+=18.39 +/- 0.14 kcal/mol, ΔS+=-29.03 +/- 0.29 e.u.; further solvent and temperatures View Scheme

1: 58 percent / CHCl3 2: 33 percent / 1,2-dichloro-benzene / 137.9 °C / first order rate constant 62.5E-5 s-1; activation parameters Ea=19.16 +/- 0.15 kcal/mol, ΔH+=18.39 +/- 0.14 kcal/mol, ΔS+=-29.03 +/- 0.29 e.u.; further solvent and temperatures View Scheme