1: With ethylmagnesium bromide in tetrahydrofuran; diethyl ether T=0 - 20°C; Inert atmosphere; 2: With tri-isopropoxy-borane in tetrahydrofuran; diethyl ether T=0 - 20°C; 3: With water; ammonium chloride in tetrahydrofuran; diethyl ether T=0°C;