1.1: 87 percent / 4-(dimethylamino)pyridinium bromide perbromide; 4-(dimethylamino)pyridine / CH2Cl2 2.1: 90 percent / LiHMDS / tetrahydrofuran 3.1: BuLi; 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone / tetrahydrofuran 4.1: hydrochloric acid / tetrahydrofuran 5.1: diethyl ether / -100 °C 6.1: imidazole / dimethylformamide 7.1: O3; Sudan red 7B / methanol 7.2: 94 percent / Me2S / methanol 8.1: 73 percent / TiCl4; diisopropylethylamine / CH2Cl2 / -78 °C 9.1: hydrochloric acid / tetrahydrofuran 10.1: (+)-10-camphorsulfonic acid 11.1: pyridine / CH2Cl2 / -10 °C 12.1: 15[crown]-5 / tetrahydrofuran 13.1: 70 percent / [Mo{N(tBu)(3,5-Me2C6H3)}3] / toluene; CH2Cl2 / 80 °C 14.1: 100 percent / H2 / Lindlar catalyst / CH2Cl2 15.1: 78 percent / ceric ammonium nitrate / acetonitrile; H2O View Scheme