1: With ozone in ethyl acetate T=-70 - -30°C; 3.5 h; 2: With acetic acid; zinc in water T=-30 - 0°C; 2 h;

1: With sodium tris(acetoxy)borohydride; N-ethyl-N,N-diisopropylamine in formaldehyde diethyl acetal T=20 - 31°C; 1.5 h; Heating / reflux; 2: With lithium hydroxide in methanol; water T=5 - 85°C; 18 h;