1.1: borane / tetrahydrofuran / 2 h / 0 °C 1.2: 78 percent / aq NaOH; 30 percent aq H2O2 / 0.5 h / 45 °C 2.1: tetra-n-butylammonium chlorde; 2.2.6.6-tetramethylpipridin-1-yloxy radical (TEMPO); N-chlorosuccinimide / CH2Cl2; various solvent(s) / 1.5 h / pH 8.6 3.1: NaClO2 / 2-methyl-propan-2-ol; various solvent(s); H2O / 20 °C View Scheme