1: With n-butyllithium in hexane; pentane T=-20 - -10°C; 0.25 h; 2: With boric acid trimethyl ester in hexane; pentane T=-30 - 0°C; 0.5 h; 3: With peracetic acid; acetic acid in hexane; pentane T=-10°C;

in sodium hydroxide 1.5 h; Heating;