magnesium in THF; Multistep reaction;

magnesium in tetrahydrofuran

1.1: disiamylborane / tetrahydrofuran / 0 °C 1.2: 62 percent / NaOH; aq. H2O2 / tetrahydrofuran / 20 °C 2.1: 75 percent / pyridinium dichromate / CH2Cl2 / 20 °C 3.1: 75 percent / 2,6-di-tert-butyl-4-methylpyridinium tetrafluoroborate / benzene / 24 h / Heating 4.1: 67 percent / Ph3SnH; AIBN / benzene-d6 / 5.5 h / 45 °C 5.1: DOWEX 50W; H2O / tetrahydrofuran / 24 h / 20 °C View Scheme