1: 9.3 percent / camphorsulfonic acid / benzene / 72 h / Heating 2: 1) DCC, DMAP, 2) 1 M HCl / 1) toluene, r.t., 6 d, 2) r.t., 28 h 3: 81 percent / m-chloroperoxybenzoic acid / acetone / 2 h / Ambient temperature View Scheme