3-amino-4-fluorophenol is a kind of organic chemistry intermediate commonly used as the intermediate for synthesizing compounds of liquid crystals, pharmaceutical compounds and agricultural chemical compounds used always.
Add 450ml water in the 5L reaction flask, 708.5g (10.9mol) zinc powder, 303g (1.09mol) 2-bromo-4-fluoro-5-amino-benzene oxygen ethyl formate, mix, 45 ℃ drip the solution that 218g (5.45mol) sodium hydroxide and 1500ml water are made into down, insulated and stirred is warming up to 60 ℃ after 1 hour to be incubated 4 hours after reactions more complete, the cooling suction filtration, getting filtrate dropping 406g (3.33mol) 30% hydrochloric acid separates product, filtration obtains brown solid, use ethyl alcohol recrystallization, get yellow solid 118.5g (0.93mol) 3-amino-4-fluorophenol after the drying. A molar yield of 85% is 99.5% through gas chromatography determination purity.136 ℃/20mmHg of boiling point.
