potassium hydroxide 1) DMSO, THF, 0 deg C, 4 h, 2) r.t., 2 h; Yield given. Multistep reaction;

1: 100 percent / diethyl ether / 24 h / Ambient temperature 2: 68 percent / NaH / tetrahydrofuran / 1) 0 deg C, 1 h, 2) r.t., 24 h View Scheme