1: 95 percent / NaOCl / CH2Cl2; H2O / 0.83 h / 0 - 5 °C / further reagent; further solvent 2: 1) 85percent H2SO4; 2) 2N NaOH / 1) 0 deg C, 40 h irradiation; 2) 0 deg C, pH 7-7.4, then 2 h reflux in 0.24N methanolic NaOH View Scheme

sodium tetrahydroborate in ethanol

1: 0.5 h / Ambient temperature 2: CH3ONa / methanol; benzene / 4 h / Heating View Scheme