1: 93 percent / TsOH / methanol / 4 h / 25 °C 2: 92 percent / CBr4, (C6H5)3P / acetonitrile / 1 h / 25 °C View Scheme

Multi-step reaction with 2 steps 1: 86 percent / 5 N NaOH / benzene / 12 h / 25 °C2: 1.) (Sia)2BH, 2.) H2O2, NaOH / 1.) THF, 0 deg C, 1 h, 2.) THF, 0 deg C, 1 h  

With  toluene-4-sulfonic acid in  methanol T=25°C; 4 h;