1: 2-methyl-5-(1-methyl-1-ethenyl)-2-cyclohexen-1-one With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78°C; 1.5 h; Inert atmosphere; 2: methyl iodide in tetrahydrofuran; hexane T=20°C; 6 h; Inert atmosphere;

[2,2']bipyridinyl; n-butyllithium; diisopropylamine 1) THF, 0 deg C, 15 min, 2) 0 deg C, 5 min; Yield given. Multistep reaction;