1: With 2,2,6,6-tetramethyl-piperidine; n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.166667 h; Inert atmosphere; 2: With 3,3-dimethyldioxirane in tetrahydrofuran; hexane T=-78 - 20°C; Inert atmosphere; 3: With ammonium chloride in tetrahydrofuran; hexane; water 0.5 h; Inert atmosphereSaturated solution;