1: 2.)1M NaOH / 1.)THF, -10 degC, 15 min 2.)THF, water, -8 to 5 degC, 10 min, RT, 25 min. 2: NaBH4 / methanol / 2 h / Ambient temperature 3: 94 percent / silica gel, oxalic acid, HgCl2 / CHCl3; H2O / 3 h / Ambient temperature View Scheme

1: LiAlH4 / diethyl ether 2: (Ph)3P, CCl4 / 48 h / Ambient temperature 3: 71 percent / dimethylsulfoxide / 3 h / Ambient temperature View Scheme

With  trichlorophosphate  anschl. mit Cycloheptanon und H2O;