potassium tert-butylate in ethylene glycol dimethyl ether T=-50°C; 0.25 h;

1: diethyl (phenyltelluromethyl)phosphonate With lithium diisopropyl amide in tetrahydrofuran T=0°C; 0.5 h; 2: phenyl tellurenyl bromide in tetrahydrofuran T=-78 - 0°C; 0.833333 h; 3: cyclohexanone in tetrahydrofuran T=20°C; Horner-Wittig reaction; 2 h;

1: methyl phosphonic acid,diethyl ester With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 2: phenyl tellurenyl bromide in tetrahydrofuran 3: cyclohexanone in tetrahydrofuran Horner-Wittig reaction;

1.1: Br2 2.1: LDA / tetrahydrofuran 2.2: tetrahydrofuran 3.1: LDA / tetrahydrofuran / 0.5 h / 0 °C 3.2: tetrahydrofuran / 0.83 h / -78 - 0 °C 3.3: 16 percent / tetrahydrofuran / 2 h / 20 °C View Scheme