chromium(VI) oxide in acetone T=0 - 20°C; Jones oxidation;

1.1: magnesium / tetrahydrofuran 1.2: 79 percent / dilithium tetrachlorocuprate / tetrahydrofuran / -78 - 20 °C 2.1: 97 percent / p-toluenesulfonic acid monohydrate / ethanol / 3 h / Heating 3.1: 74 percent / Jones' CrO3 reagent / acetone / 0 - 20 °C View Scheme

1.1: magnesium / tetrahydrofuran 1.2: 99 percent / dilithium tetrachlorocuprate / tetrahydrofuran / -78 - 20 °C 2.1: 89 percent / pyridine / 0 - 4 °C 3.1: magnesium / tetrahydrofuran 3.2: 79 percent / dilithium tetrachlorocuprate / tetrahydrofuran / -78 - 20 °C 4.1: 97 percent / p-toluenesulfonic acid monohydrate / ethanol / 3 h / Heating 5.1: 74 percent / Jones' CrO3 reagent / acetone / 0 - 20 °C View Scheme

1.1: 89 percent / pyridine / 0 - 4 °C 2.1: magnesium / tetrahydrofuran 2.2: 79 percent / dilithium tetrachlorocuprate / tetrahydrofuran / -78 - 20 °C 3.1: 97 percent / p-toluenesulfonic acid monohydrate / ethanol / 3 h / Heating 4.1: 74 percent / Jones' CrO3 reagent / acetone / 0 - 20 °C View Scheme

1.1: magnesium / tetrahydrofuran 1.2: 99 percent / dilithium tetrachlorocuprate / tetrahydrofuran / -78 - 20 °C 2.1: 89 percent / pyridine / 0 - 4 °C 3.1: magnesium / tetrahydrofuran 3.2: 79 percent / dilithium tetrachlorocuprate / tetrahydrofuran / -78 - 20 °C 4.1: 97 percent / p-toluenesulfonic acid monohydrate / ethanol / 3 h / Heating 5.1: 74 percent / Jones' CrO3 reagent / acetone / 0 - 20 °C View Scheme

1.1: magnesium / tetrahydrofuran 1.2: 79 percent / dilithium tetrachlorocuprate / tetrahydrofuran / -78 - 20 °C 2.1: 97 percent / p-toluenesulfonic acid monohydrate / ethanol / 3 h / Heating 3.1: 74 percent / Jones' CrO3 reagent / acetone / 0 - 20 °C View Scheme

1: 97 percent / p-toluenesulfonic acid monohydrate / ethanol / 3 h / Heating 2: 74 percent / Jones' CrO3 reagent / acetone / 0 - 20 °C View Scheme

methanol; sodium Electrolysis.anschliessende Hydrolyse;