1: 89 percent / sodium borohydride, 2 M NaOH / ethanol; H2O / Ambient temperature 2: 75 percent / 1.) tetrabutylammonium iodide, 12 M NaOH / 1.) petroleum ether, 30 min; 2.) 4 h 3: 40 percent / nitric acid, sulphuric acid / 4 h / -15 °C 4: 1.) stannous chloride dihydrate; 2.) 15percent KOH / 1.) abs. ethanol, reflux, 4 h; 2.) 48 h 5: 1.) lithium bromide; 2.) 1.25M NaOH / 1.) reflux, 4 h; 2.) reflux, 1 h View Scheme

1: 75 percent / 1.) tetrabutylammonium iodide, 12 M NaOH / 1.) petroleum ether, 30 min; 2.) 4 h 2: 40 percent / nitric acid, sulphuric acid / 4 h / -15 °C 3: 1.) stannous chloride dihydrate; 2.) 15percent KOH / 1.) abs. ethanol, reflux, 4 h; 2.) 48 h 4: 1.) lithium bromide; 2.) 1.25M NaOH / 1.) reflux, 4 h; 2.) reflux, 1 h View Scheme

1: 1.) stannous chloride dihydrate; 2.) 15percent KOH / 1.) abs. ethanol, reflux, 4 h; 2.) 48 h 2: 1.) lithium bromide; 2.) 1.25M NaOH / 1.) reflux, 4 h; 2.) reflux, 1 h View Scheme

sodium hydroxide; lithium bromide 1.) reflux, 4 h; 2.) reflux, 1 h; Multistep reaction;