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    • 80. 发明授权
    • Process for preparing [bis-(trifluoromethyl)-phenyl]-acetic acids and alkyl esters thereof and dialkyl [bis-(trifluoromethyl)-phenyl]-malonates
    • 制备[双(三氟甲基) - 苯基] - 乙酸及其烷基酯和[双(三氟甲基) - 苯基] - 丙二酸二烷基酯的方法
    • US06395921B1
    • 2002-05-28
    • US09635164
    • 2000-08-09
    • Albrecht MarholdJörn Stölting
    • Albrecht MarholdJörn Stölting
    • C07C6976
    • C07C69/65C07C51/38C07C67/32C07C67/343C07C57/58
    • [Bis-(trifluoromethyl)-phenyl]-acetic acids are obtained in an advantageous manner by reacting an appropriate bromo- or iodo-bis-(trifluoromethyl)-benzene with a di-C1-C4-alkyl malonate in the presence of a deprotonating agent and a copper salt and hydrolysing and decarboxylating the reaction product in basic medium. It is possible to obtain a mixture of alkyl [bis-(trifluoromethyl)-phenyl]-acetate and alkyl [bis-(tri-fluoromethyl)-phenyl]-malonate by admixing the reaction mixture which is present before hydrolysis and complete decarboxylation with water and acid and heating. From the mixture, it is possible to obtain alkyl [bis-(trifluoromethyl)-phenyl]-acetate by distillation under reduced pressure and dialkyl [bis-(trifluoromethyl)-phenyl]-malonate by work-up by column chromatography, fractional distillation or film distillation. [Bis-(trifluoromethyl)-phenyl]-malonic esters are novel compounds.
    • 通过使合适的溴 - 或碘 - 双 - (三氟甲基) - 苯与二-C1- C4烷基丙二酸酯在去质子化反应的存在下,通过有利的方式获得[双(三氟甲基) - 苯基] - 乙酸 试剂和铜盐,并在碱性介质中水解和脱羧反应产物。 可以通过将水解之前存在的反应混合物与水完全脱羧反应获得[双((三氟甲基) - 苯基] - 乙酸烷基酯和[双 - (三氟甲基) - 苯基] - 丙二酸烷基酯的混合物 酸和加热。 从混合物中,可以通过在柱下色谱法,分馏或后处理中减压蒸馏和[双(三氟甲基) - 苯基] - 丙二酸二烷基酯来获得[双(三氟甲基) - 苯基] [双(三氟甲基) - 苯基] - 丙二酸酯是新化合物。