1: 93 percent / 1.) BuLi / 1.) hexane, THF, HMPA, -78 degC to room temp. in 3 h, 2a.) -78 degC, 1 h, 2b.) room temp. overnight 2: 82 percent / HgCl2, HgO / methanol; H2O / a.) room temp., 5 h, b.) 50 degC, 1 h View Scheme