6-Amino-7-fluoro-2H-1,4-benzoxazin-3 synthesis of herbicide flumioxazin, was prepared （4H）-one （Ⅱ）, an essential intermediate for through hydrogenation of 7-fluoro-6-nitro -2H-1,4- benzoxazin-3（4H）-one （ Ⅰ ） catalyzed by Raney Ni with high yield. The optimum process conditions were reaction temperature 80℃ , reaction time 5 h, amount of catalyst 5% based on Ⅰ , and H2 pressure 6 MPa. The yield was 95.2% and weight percent of Ⅱ was 98. 5%. The solvent and the catalyst were reused for five times and showed no bad effect to the yield ...
