A re-investigation of the reaction of hemimellitic acid with sulphur tetrafluoride. A simple preparation of 2,6-bis(trifluoromethyl)benzoic acid
作者:Wojciech Dmowski、Wojciech Wiszniewski
DOI:10.1016/s0022-1139(96)03541-5
日期:1997.5
of hemimellitic acid (1) with SF4/HF gives a 1 : 3.5 : 13 mixture of 1,2,3-tris (trifluoromethyl) benzene (2), 1,1,3,3-tetrafluoro 4-trifluoromethyl-l, 3-dihydroisobenzofuran (3) and 2,6-bis(trifluoromethyl)benzoyl fluoride (4). Treatment of the crude reaction mixture with aqueous KOH, followed by acidification of the water phase, gives a good yield of pure 2,6-bis(trifluoromethyl)benzoic acid (5)
偏苯四酸(1)与SF 4 / HF的反应生成1,2,3-三(三氟甲基)苯(2),1,1,3,3-四氟4-三氟甲基- 1,3-二氢异苯并呋喃(3)和2,6-双(三氟甲基)苯甲酰氟(4)。用KOH水溶液处理粗反应混合物,然后酸化水相,得到纯的2,6-双(三氟甲基)苯甲酸(5)的良好产率。