1: 4-methyl-3-buten-2-one With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78°C; 0.25 h; 2: 3-phenyl-propionaldehyde in tetrahydrofuran; hexane T=-78°C; 0.25 h;

in tetrahydrofuran T=-40 - 0°C;