1: 2,4-dimethyl-3-pentyl α-trimethylsilanylacetate With lithium diisopropyl amide in tetrahydrofuran 2: trans-1,3-diphenyl-2-propen-1-one in tetrahydrofuran T=-78°C;

1: 2,4-dimethyl-3-pentyl α-trimethylsilanylacetate With (1R,2R)-1,2-diphenyl-1,2-dimethoxyethane; lithium diisopropyl amide in toluene T=-20°C; 1 h; 2: trans-1,3-diphenyl-2-propen-1-one in toluene T=-78°C; 0.5 h;