1: 96 percent / sodium perborate tetrahydrate / acetic acid / 3 h / 50 °C 2: 2 percent Chromat. / Ni(acac)2 / tetrahydrofuran; diethyl ether / 24 h / Ambient temperature View Scheme

1: 96 percent / sodium perborate tetrahydrate / acetic acid / 3 h / 50 °C 2: 81 percent / Ni(acac)2 / tetrahydrofuran; diethyl ether / 24 h / Ambient temperature View Scheme

1: 96 percent / sodium perborate tetrahydrate / acetic acid / 3 h / 50 °C 2: 1.) BuLi / 1) hexane, THF, -70 deg C, 30 min; 2) THF, hexane, -70 deg C --> room temperature 2 h 3: 5 percent Chromat. / Ni(acac)2 / tetrahydrofuran; diethyl ether / 24 h / 40 °C View Scheme