1.1: tetrabutylammonium iodide; 1,8-diazabicyclo[5.4.0]undec-7-ene / toluene / 2 h / Heating 1.2: 87 percent / sulfuric acid / toluene; tetrahydrofuran; H2O / 1 h / 20 °C 2.1: 99 percent / tetrabutylammonium fluoride / tetrahydrofuran / 1 h / 20 °C 3.1: 87 percent / sodium borohydride / propan-2-ol / 24 h / Heating View Scheme

1.1: tetrabutylammonium iodide; 1,8-diazabicyclo[5.4.0]undec-7-ene / toluene / 2 h / Heating 1.2: 87 percent / sulfuric acid / toluene; tetrahydrofuran; H2O / 1 h / 20 °C 2.1: 99 percent / tetrabutylammonium fluoride / tetrahydrofuran / 1 h / 20 °C View Scheme