1: 1.) Mg / 1.) THF, 2.) THF, -40 deg C to -50 deg C, 1.5h 2: 49 percent / 1.68N HCl / diethyl ether 3: 1.) 1.5N n-butyllithium / 1.) THF, hexane, 2.) 20h, RT 4: 73 percent Spectr. / 2.14N HCl / tetrahydrofuran; diethyl ether 5: H2O2 / acetone View Scheme

dihydrogen peroxide in acetone

1: 1.) 1.5N n-butyllithium / 1.) THF, hexane, 2.) 20h, RT 2: 73 percent Spectr. / 2.14N HCl / tetrahydrofuran; diethyl ether 3: H2O2 / acetone View Scheme

1: 49 percent / 1.68N HCl / diethyl ether 2: 1.) 1.5N n-butyllithium / 1.) THF, hexane, 2.) 20h, RT 3: 73 percent Spectr. / 2.14N HCl / tetrahydrofuran; diethyl ether 4: H2O2 / acetone View Scheme

1: 73 percent Spectr. / 2.14N HCl / tetrahydrofuran; diethyl ether 2: H2O2 / acetone View Scheme