1: pyridine / 72 h / 30 °C 2: 44 percent / NaNO2 / dimethylsulfoxide / 1 h / 135 °C 3: 64 percent / pyridine / 20 h / Ambient temperature 4: 90 percent / conc. HCl / CHCl3; methanol / 64 h / Ambient temperature 5: 89 percent / aluminium isopropoxide / toluene; cyclohexanone / 0.75 h / Heating 6: 80 percent / 5percent KOH / methanol / 4 h / 65 °C View Scheme

1: pyridine / 24 h 2: 25 percent / potassium acetate / dimethylsulfoxide / 6 h / 100 °C View Scheme

1: pyridine / 72 h / 30 °C 2: 17 percent / NaNO2 / dimethylsulfoxide / 1 h / 135 °C View Scheme

1: (i) PhSO2Cl, Py, (ii) /BRN= 2510253/ 2: KOH / methanol; CH2Cl2 3: Al(OiPr)3, cyclohexanone / toluene View Scheme

tert.-butylhydroperoxide; copper(l) iodide in decane; acetonitrile T=50°C; 24 h; Title compound not separated from byproducts;

1: (i) PhSO2Cl, Py, (ii) /BRN= 2510253/ 2: KOH / methanol; CH2Cl2 3: Al(OiPr)3, cyclohexanone / toluene View Scheme

1: (i) PhSO2Cl, Py, (ii) /BRN= 2510253/ 2: KOH / methanol; CH2Cl2 3: Al(OiPr)3, cyclohexanone / toluene View Scheme

1: pyridine / 72 h / 30 °C 2: 26 percent / NaNO2 / dimethylsulfoxide / 1 h / 135 °C View Scheme

pyridine

toluene-4-sulfonic acid; toluene