1: 4-(N,N-dimethlyamino)pyridine / dichloromethane / 8 h / 20 °C 2: boron trifluoride diethyl etherate / dichloromethane / 0.5 h / -78 - -40 °C 3: selenium(IV) oxide / 1,4-dioxane / 14 h / 80 °C 4: pyridine; 4-(N,N-dimethlyamino)pyridine / 1,4-dioxane / 1 h / 20 °C 5: hydrogen fluoride / acetonitrile / 10 h / 50 °C 6: Martin's sulfurane / chloroform / 3 h / 80 °C 7: sodium hydroxide; water / tetrahydrofuran / 1 h 8: selenium(IV) oxide; formic acid / 1,4-dioxane / 1.25 h / 80 °C View Scheme

1: boron trifluoride diethyl etherate / dichloromethane / 0.5 h / -78 - -40 °C 2: selenium(IV) oxide / 1,4-dioxane / 14 h / 80 °C 3: pyridine; 4-(N,N-dimethlyamino)pyridine / 1,4-dioxane / 1 h / 20 °C 4: hydrogen fluoride / acetonitrile / 10 h / 50 °C 5: Martin's sulfurane / chloroform / 3 h / 80 °C 6: sodium hydroxide; water / tetrahydrofuran / 1 h 7: selenium(IV) oxide; formic acid / 1,4-dioxane / 1.25 h / 80 °C View Scheme

1: selenium(IV) oxide / 1,4-dioxane / 14 h / 80 °C 2: pyridine; 4-(N,N-dimethlyamino)pyridine / 1,4-dioxane / 1 h / 20 °C 3: hydrogen fluoride / acetonitrile / 10 h / 50 °C 4: Martin's sulfurane / chloroform / 3 h / 80 °C 5: sodium hydroxide; water / tetrahydrofuran / 1 h 6: selenium(IV) oxide; formic acid / 1,4-dioxane / 1.25 h / 80 °C View Scheme

1: hydrogen fluoride / acetonitrile / 10 h / 50 °C 2: Martin's sulfurane / chloroform / 3 h / 80 °C 3: sodium hydroxide; water / tetrahydrofuran / 1 h 4: selenium(IV) oxide; formic acid / 1,4-dioxane / 1.25 h / 80 °C View Scheme

1: Martin's sulfurane / chloroform / 3 h / 80 °C 2: sodium hydroxide; water / tetrahydrofuran / 1 h 3: selenium(IV) oxide; formic acid / 1,4-dioxane / 1.25 h / 80 °C View Scheme

1: 66 percent / 70percent perchloric acid / methanol / 1 h 2: 103 mg / phosphorpentoxid 3: 31 percent / 70percent perchloric acid / methanol / 0.75 h View Scheme

1.1: lithium hexamethyldisilazane / tetrahydrofuran / 4 h / -78 °C 2.1: tetrahydrofuran / 3 h / -78 - -15 °C 3.1: triethylamine / dichloromethane / 0.5 h / 0 °C 4.1: triethylamine / dichloromethane / 1.5 h / 0 °C 5.1: [RhCl(CO)2]2; carbon monoxide / para-xylene / 12 h / 140 °C 6.1: tetrahydrofuran / 0.5 h / -78 - 0 °C 7.1: osmium(VIII) oxide; pyridine / 12 h / 20 °C 7.2: 12 h / 20 °C 8.1: 4-(N,N-dimethlyamino)pyridine / dichloromethane / 8 h / 20 °C 9.1: boron trifluoride diethyl etherate / dichloromethane / 0.5 h / -78 - -40 °C 10.1: selenium(IV) oxide / 1,4-dioxane / 14 h / 80 °C 11.1: pyridine; 4-(N,N-dimethlyamino)pyridine / 1,4-dioxane / 1 h / 20 °C 12.1: hydrogen fluoride / acetonitrile / 10 h / 50 °C 13.1: Martin's sulfurane / chloroform / 3 h / 80 °C 14.1: sodium hydroxide; water / tetrahydrofuran / 1 h 15.1: selenium(IV) oxide; formic acid / 1,4-dioxane / 1.25 h / 80 °C View Scheme

1.1: triethylamine / dichloromethane / 0.5 h / 0 °C 2.1: triethylamine / dichloromethane / 1.5 h / 0 °C 3.1: [RhCl(CO)2]2; carbon monoxide / para-xylene / 12 h / 140 °C 4.1: tetrahydrofuran / 0.5 h / -78 - 0 °C 5.1: osmium(VIII) oxide; pyridine / 12 h / 20 °C 5.2: 12 h / 20 °C 6.1: 4-(N,N-dimethlyamino)pyridine / dichloromethane / 8 h / 20 °C 7.1: boron trifluoride diethyl etherate / dichloromethane / 0.5 h / -78 - -40 °C 8.1: selenium(IV) oxide / 1,4-dioxane / 14 h / 80 °C 9.1: pyridine; 4-(N,N-dimethlyamino)pyridine / 1,4-dioxane / 1 h / 20 °C 10.1: hydrogen fluoride / acetonitrile / 10 h / 50 °C 11.1: Martin's sulfurane / chloroform / 3 h / 80 °C 12.1: sodium hydroxide; water / tetrahydrofuran / 1 h 13.1: selenium(IV) oxide; formic acid / 1,4-dioxane / 1.25 h / 80 °C View Scheme

1.1: N-chloro-succinimide; 4-(N,N-dimethlyamino)pyridine / dichloromethane / 3 h / 20 °C 2.1: ozone; thiourea / dichloromethane; methanol / 2 h 3.1: naphthalenyllithium; N,N,N',N',N'',N''-hexamethylphosphoric triamide / tetrahydrofuran / 1.5 h / -78 - 20 °C 4.1: lithium hexamethyldisilazane / tetrahydrofuran / 4 h / -78 °C 5.1: tetrahydrofuran / 3 h / -78 - -15 °C 6.1: triethylamine / dichloromethane / 0.5 h / 0 °C 7.1: triethylamine / dichloromethane / 1.5 h / 0 °C 8.1: [RhCl(CO)2]2; carbon monoxide / para-xylene / 12 h / 140 °C 9.1: tetrahydrofuran / 0.5 h / -78 - 0 °C 10.1: osmium(VIII) oxide; pyridine / 12 h / 20 °C 10.2: 12 h / 20 °C 11.1: 4-(N,N-dimethlyamino)pyridine / dichloromethane / 8 h / 20 °C 12.1: boron trifluoride diethyl etherate / dichloromethane / 0.5 h / -78 - -40 °C 13.1: selenium(IV) oxide / 1,4-dioxane / 14 h / 80 °C 14.1: pyridine; 4-(N,N-dimethlyamino)pyridine / 1,4-dioxane / 1 h / 20 °C 15.1: hydrogen fluoride / acetonitrile / 10 h / 50 °C 16.1: Martin's sulfurane / chloroform / 3 h / 80 °C 17.1: sodium hydroxide; water / tetrahydrofuran / 1 h 18.1: selenium(IV) oxide; formic acid / 1,4-dioxane / 1.25 h / 80 °C View Scheme

1.1: 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione 2.1: lithium hexamethyldisilazane / tetrahydrofuran / 4 h / -78 °C 3.1: tetrahydrofuran / 3 h / -78 - -15 °C 4.1: triethylamine / dichloromethane / 0.5 h / 0 °C 5.1: triethylamine / dichloromethane / 1.5 h / 0 °C 6.1: [RhCl(CO)2]2; carbon monoxide / para-xylene / 12 h / 140 °C 7.1: tetrahydrofuran / 0.5 h / -78 - 0 °C 8.1: osmium(VIII) oxide; pyridine / 12 h / 20 °C 8.2: 12 h / 20 °C 9.1: 4-(N,N-dimethlyamino)pyridine / dichloromethane / 8 h / 20 °C 10.1: boron trifluoride diethyl etherate / dichloromethane / 0.5 h / -78 - -40 °C 11.1: selenium(IV) oxide / 1,4-dioxane / 14 h / 80 °C 12.1: pyridine; 4-(N,N-dimethlyamino)pyridine / 1,4-dioxane / 1 h / 20 °C 13.1: hydrogen fluoride / acetonitrile / 10 h / 50 °C 14.1: Martin's sulfurane / chloroform / 3 h / 80 °C 15.1: sodium hydroxide; water / tetrahydrofuran / 1 h 16.1: selenium(IV) oxide; formic acid / 1,4-dioxane / 1.25 h / 80 °C View Scheme