1.1: 81 percent / tetrabutylammonium bromide; sodium dithionite; potassium hydroxide / tetrahydrofuran; H2O / 16 h / 20 °C 2.1: 83 percent / phosphoryl chloride / CH2Cl2 / 0 - 20 °C 3.1: 72 percent / hydrogen peroxide; sulfuric acid / methanol; H2O / 1.5 h / 20 °C 4.1: 74 percent / tetrabutylammonium bromide; sodium dithionite; potassium hydroxide / tetrahydrofuran; H2O / 16 h / 20 °C 5.1: n-butyllithium; TMEDA / tetrahydrofuran / -78 - 20 °C 5.2: 55 percent / tetrahydrofuran / -78 - 20 °C 6.1: n-butyllithium; TMEDA / tetrahydrofuran / -78 - 20 °C 6.2: 95 percent / tetrahydrofuran / -78 - 20 °C 7.1: silver(II) oxide; nitric acid / dioxane; H2O / 0.03 h / 20 °C 7.2: sodium hydroxide / methanol; H2O / 0.5 h / 20 °C View Scheme

1.1: 81 percent / tetrabutylammonium bromide; sodium dithionite; potassium hydroxide / tetrahydrofuran; H2O / 16 h / 20 °C 2.1: 83 percent / phosphoryl chloride / CH2Cl2 / 0 - 20 °C 3.1: 72 percent / hydrogen peroxide; sulfuric acid / methanol; H2O / 1.5 h / 20 °C 4.1: 74 percent / tetrabutylammonium bromide; sodium dithionite; potassium hydroxide / tetrahydrofuran; H2O / 16 h / 20 °C 5.1: n-butyllithium; TMEDA / tetrahydrofuran / -78 - 20 °C 5.2: 55 percent / tetrahydrofuran / -78 - 20 °C 6.1: 100 percent / boron tribromide / CH2Cl2 / -78 - 20 °C View Scheme

potassium carbonate

potassium carbonate in N,N-dimethyl-formamide Heating;

potassium hydroxide; air anschliessend Erwaermen mit methanol.HCl;

acetic acid

silver(l) oxide

potassium carbonate; acetone

(i) Ac2O, H2SO4, (ii) aq. NaOH, (iii) /BRN= 1098229/, HCl; Multistep reaction;