1.1: 49 percent / sodium carbonate / toluene / 2 h / 90 - 100 °C 2.1: 83.6 percent / xylene / 72 h / 105 °C 3.1: 54 percent / sodium hydride; pyridine / 1 h / 75 - 85 °C 4.1: trifluoroacetic acid / 168 h 5.1: sodium hydride / tetrahydrofuran / 0.25 h / -78 °C 5.2: tetrahydrofuran / 1 h / 20 °C 6.1: 28 percent / sodium iodide; trifluoroacetic acid / acetonitrile / 0 °C 7.1: ozone / methanol / 0.17 h / -40 °C 7.2: methyl sulfide / methanol 7.3: 45 percent / sodium borohydride / methanol / 2 h / 0 °C View Scheme