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    • 1. 发明申请
    • Flourination of dicarbonyl compounds
    • 二羰基化合物的泛化
    • US20050256332A1
    • 2005-11-17
    • US10505083
    • 2003-02-19
    • John Moilliet
    • John Moilliet
    • C07C67/307C07C20060101C07C45/63C07C49/167C07C51/363C07C67/54C07C69/003C07C69/66C07C69/716C07C253/30C07C25/39
    • C07C67/307C07C69/716
    • The invention provides a method for the preparation of a dicarbonyl compound of formula (I) R1COCFR2COR3 wherein R1 is selected from alkyl, substituted alkyl, cycloalkyl, aryl, substituted aryl and acetoxy, R2 is selected from hydrogen, halogen, nitro, cyano, alkyl, substituted alkyl, cycloalkyl, acetoxy, aryl and substituted aryl, and R3 is selected from alkyl, substituted alkyl, oxyalkyl and substituted oxyalkyl, the method comprising treating a dicarbonyl compound of formula (II) R1COCHR2COR3 with elemental fluorine in a solvent which consists of methanol or aqueous methanol. The method provides an inexpensive and convenient synthetic route to 2-fluoro- and 2,2-difluoro-1,3-diketones and -1,3-ketoesters.
    • 本发明提供一种制备式(I)的二羰基化合物的方法,其中R 1,R 2,R c, 选自烷基,取代的烷基,环烷基,芳基,取代的芳基和乙酰氧基,R 2选自氢,卤素,硝基,氰基,烷基,取代的烷基,环烷基,乙酰氧基, 芳基和取代的芳基,R 3选自烷基,取代的烷基,烷氧基和取代的烷氧基,该方法包括处理式(II)的二羰基化合物R 1 COCHR 在由甲醇或甲醇水溶液组成的溶剂中,使用元素氟。 该方法为2-氟-2,2-二氟-1,3-二酮和-1,3-酮酯提供了便宜且方便的合成途径。
    • 4. 发明申请
    • Process for producting bis(4-hydroxy-3-nitrophenyl) compound
    • 制备双(4-羟基-3-硝基苯基)化合物的方法
    • US20030055288A1
    • 2003-03-20
    • US10257218
    • 2002-10-10
    • Eiichi TanakaMasaki Fujimoto
    • C07C323/09C07C25/13C07C25/39
    • C07C201/08C07C315/04C07C317/22C07C205/22C07C205/38
    • The present invention relates to a process for producing a bis(4-hydroxy-3-nitrophenyl) compounds, characterized by nitrating a bis(4-hydroxyphenyl) compound wherein two phenyl groups are bonded to each other directly or through an electron-donating bridging group, sulfoxide group, sulfone group or carbonyl group in an inert solvent using nitric acid under the condition of substantially free from any other acid. According to the process, the target compounds reduced in the content of trinitrates can be produced in high yield and further recrystallizing the compound easily gives in high yield a high-purity products suitable for use as a raw material of producing a heat-resistant polymer and so on because the content of a trinitro-substitued compound in that compound is low.
    • 本发明涉及一种双(4-羟基-3-硝基苯基)化合物的制备方法,其特征在于硝化双(4-羟基苯基)化合物,其中两个苯基直接键合或通过给电子桥接 基团,亚砜基,砜基或羰基,在惰性溶剂中,使用硝酸在基本上不含任何其它酸的条件下进行。 根据该方法,可以高产率地制备三硝酸酯含量降低的目标化合物,进一步重结晶化合物容易高产率地获得适合用作生产耐热聚合物的原料的高纯度产品, 因为该化合物中三硝基取代的化合物的含量低。