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    • 4. 发明授权
    • Process for preparing 2,4-dihydroxyphenyl 4-methoxybenzyl ketones
    • 制备2,4-二羟基苯基4-甲氧基苄基酮的方法
    • US08324431B2
    • 2012-12-04
    • US12525023
    • 2008-02-16
    • Sergii PazenokNorbert Lui
    • Sergii PazenokNorbert Lui
    • C07C49/00C07D311/00
    • C07C45/46C07C49/83C07C49/84
    • The invention relates to a process for preparing 2,4-dihydroxyphenyl 4-methoxybenzyl ketones of the formula (I) by Friedel-Crafts acylation in hydrogen fluoride (HF).2,4-Dihydroxyphenyl 4-methoxybenzyl ketones of the formula (I) in which R1 and R2 are each hydrogen, chlorine, fluorine, bromine, iodine, CF3, methyl, optionally substituted alkoxy, —OCF3, —C(CH3)3, —CH2(CH3)2, —CH(CH3)2, R3 is hydrogen, Cl, F, Br, optionally substituted alkyl, optionally substituted alkoxy, —C(CH3)3, and X is hydroxyl, F, Cl, Br, optionally substituted alkoxy, are obtained in high yield and high purity by reacting phenylacetic acid derivatives of the formula (II) with phenols of the formula (III) in liquid hydrogen fluoride (HF).
    • 本发明涉及通过在氟化氢(HF)中弗瑞德 - 克来福特酰化制备式(I)的2,4-二羟基苯基4-甲氧基苄基酮的方法。 式(I)的2,4-二羟基苯基4-甲氧基苄基酮,其中R 1和R 2各自为氢,氯,氟,溴,碘,CF 3,甲基,任选取代的烷氧基,-OCF 3,-C(CH 3) -CH 2(CH 3)2,-CH(CH 3)2,R 3是氢,Cl,F,Br,任选取代的烷基,任选取代的烷氧基,-C(CH 3)3,X是羟基,F,Cl,Br, 通过使式(II)的苯乙酸衍生物与式(III)的酚在液体氟化氢(HF)中反应,以高产率和高纯度获得任选取代的烷氧基。