1: 62 percent / sodium hydrogencarbonate / H2O / 2 h / 10 °C 2: magnesium / tetrahydrofuran / 2 h / Heating 3: tetrahydrofuran / 1.) 0.5 h, room temp.; 2 h, reflux View Scheme

1: magnesium / tetrahydrofuran / 2 h / Heating 2: tetrahydrofuran / 1.) 0.5 h, room temp.; 2 h, reflux View Scheme

n-butyllithium; N,N,N',N,-tetramethylethylenediamine 1.) n-hexane, 2.) n-hexane; Yield given. Multistep reaction;

in tetrahydrofuran 1.) 0.5 h, room temp.; 2 h, reflux; Yield given;