1: 88 percent / 1) conc. HCl, H2; 2) 0.2 N HCl / 1) 5 percent Pd-C / methanol; H2O / 1) 1 h, RT; 2) 1 h, 80 deg C 2: nitrous acid / H2O / 90 °C View Scheme

trifluoroacetic acid in 1,2-dichloro-ethane Heating;