求助3，5-二羟基苯甲醛的合成的和邻氨基三氟甲苯的合成？ 邻三氟甲基苯胺的合成 abstract -------------------------------------------------------------------------------- a process for preparing orthotrifluoromethyl aniline from trifluoromethyl benzene is disclosed. the steps are (a) reacting the trifluoromethyl benzene with gaseous chlorine in the presence of a chlorination catalyst until at least 90% of the trifluoromethyl benzene is consumed; (b) nitrating the crude mixture from step (a) using a mixture of sulfuric acid and nitric acid until disappearance of the chlorotrifluoromethyl benzenes; (c) settling and washing the organic phase from step (b); (d) subjecting the organic phase from step (c) to a first hydrogenation under pressure in the presence of a hydrogenation catalyst consisting of raney nickel and/or raney nickel doped with chromium, in an organic-solvent medium until complete disappearance of the chloronitrotrifluoromethyl benzenes; (e) subjecting the mixture from step (d) to a second hydrogenation in the presence of an additional amount of raney nickel and in the presence of at least one alkaline base; and (f) removing the orthotrifluoromethyl aniline by distillation from the reaction mixture. 专利号us4387246查看更多
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