1: 1) sec-BuLi / 1) cyclohexane, THF, -105 deg C, 1 h, 2) THF, -105 deg C, 1 h 2: 54 percent / 90percent formic acid / 1 h / Heating View Scheme

1: 1) sec-BuLi / 1) cyclohexane, -105 deg C, 2) -105 deg C 2: 95 percent / 90percent formic acid / 1 h / Heating View Scheme